Faculty Profiles - Yamakata Akira

Papers - Yamakata Akira

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Designing and Understanding Biphasic TiO2 Composites for a Long-Lasting Photocatalytic Air Purification Reviewed

Ulfi Muliane, Shi Nee Lou, Shinbi Lee, Fei He, Shen Zhao, Kosaku Kato, Akira Yamakata, Wonyong Choi

ACS ES&T Engineering 2025.4

Boosted Photocatalytic Water Oxidation over BaTaO2N Produced from Perovskite Oxides Based on Photoinduced Charge Carriers

Junie Jhon M. Vequizo, Kosaku Kato, Shanshan Chen, Takashi Hisatomi, Zheng Wang, Tsuyoshi Takata, Akira Yamakata, Kazunari Domen

Energy & Fuels 2025.4

Conduction Band and Defect Engineering for the Prominent Visible‐Light Responsive Photocatalysts Reviewed

Akira Yamakata, Kosaku Kato, Takafumi Ogawa, Kanta Ogawa, Makoto Ogawa, Daichi Kato, Chengchao Zhong, Akihide Kuwabara, Ryu Abe, Hiroshi Kageyama

Angewandte Chemie International Edition 2024.12

Authorship：Lead author,　Corresponding author Publishing type：Research paper (scientific journal) Publisher：Wiley

Controlling trap depth is crucial to improve photocatalytic activity, but designing such crystal structures has been challenging. In this study, we discovered that in 2D materials like BiOCl and Bi4NbO8Cl, composed of interleaved [Bi2O2]2+ and Cl‐ slabs, the trap depth can be controlled by manipulating the slab stacking structure. In BiOCl, oxygen vacancies (VO) create deep electron traps, while chlorine vacancies (VCl) produce shallow traps. The depth is determined by the coordination around anion vacancies: VO forms strong σ bonds with Bi‐6p dangling bonds below the conduction band minimum (CBM), while those around Cl are parallel, forming weak π‐bonding. The strong re‐hybridization makes the trap depth deeper. In Bi4NbO8Cl, VCl also creates shallow traps, but VO does not produce deep traps although Bi‐6p orbitals are also forming strong σ bonding. This difference is attributed to the difference of energy level of CBM. In both cases, CBM consists of Bi‐6p orbitals extending into the Cl layers. However, these orbitals are isolated in BiOCl, but those in Bi4NbO8Cl are bonded with each other between neighboring [Bi2O2]2+ layers. This unique bonding‐based CBM prevents the formation of deep electron traps, and significantly enhances H2 evolution activity by prolonging lifetime of highly reactive free electrons.

DOI： 10.1002/anie.202419624

Zeolite-decorated black TiOx quantum dots for photocatalytic degradation of organic cationic dyes under LED light irradiation Reviewed

Mohammad Rahim Pour, Mohammad Fereidooni, Supareak Praserthdam, Piyasan Praserthdam, Victor Marquez, Kaito Uesaka, Akira Yamakata, C.V. Paz, Nattawut kamjam, Pongsakorn kanjanaboos

Journal of Alloys and Compounds 1008 176797 - 176797 2024.12

Surface Modifications of Layered Perovskite Oxysulfide Photocatalyst Y₂Ti₂O₅S₂ to Enhance Visible‐Light‐Driven Water Splitting Reviewed

Xizhuang Liang, Junie Jhon M. Vequizo, Lihua Lin, Xiaoping Tao, Qiulian Zhu, Mamiko Nakabayashi, Daling Lu, Hiroaki Yoshida, Akira Yamakata, Takashi Hisatomi, Tsuyoshi Takata, Kazunari Domen

Advanced Science 2024.11

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Abstract

Increasing the efficiency of visible‐light‐driven water splitting systems will require improvements in the charge separation characteristics and redox reaction kinetics associated with narrow‐bandgap photocatalysts. Although the traditional approach of loading a single cocatalyst on selective facets provides reaction sites and reduces the reaction overpotential, pronounced surface charge carrier recombination still results in limited efficiency increases. The present study demonstrates a significant improvement in the hydrogen evolution activity of the layered single‐crystal photocatalyst Y₂Ti₂O₅S₂. Increased performance is obtained through sequential loading of Pt cocatalysts using a two‐step process followed by photodeposition of Cr₂O₃ nanolayers. The stepwise deposition of Pt involved an impregnation‐reduction pretreatment with subsequent photodeposition and produced numerous hydrogen production sites while promoting electron capture. The Cr₂O₃ shells formed on Pt nanoparticles further promoted electron transfer from the Pt to the water and inhibited surface carrier recombination. Importantly, it is also possible to construct a Z‐scheme overall water splitting system using the optimized Y₂Ti₂O₅S₂ in combination with surface‐modified BiVO₄ in the presence of [Fe(CN)₆]^3−/4−, yielding a solar‐to‐hydrogen energy conversion efficiency of 0.19%. This work provides insights into precise surface modifications of narrow‐bandgap photocatalysts as a means of improving the solar water splitting process.

DOI： 10.1002/advs.202412326

Simultaneous Structural and Electronic Engineering on Bi‐ and Rh‐co‐doped SrTiO3 for Promoting Photocatalytic Water Splitting Reviewed

Zhenhua Pan, Junie Jhon M. Vequizo, Hiroaki Yoshida, Jianuo Li, Xiaoshan zheng, Chiheng Chu, Qian Wang, Mengdie Cai, Song Sun, Kenji Katayama, Akira Yamakata, Kazunari Domen

Angewandte Chemie International Edition 2024.8

Language：English Publishing type：Research paper (scientific journal)

<jats:p>Activating metal ion‐doped oxides as visible‐light‐responsive photocatalysts requires intricate structural and electronic engineering, a task with inherent challenges. In this study, we employed a solid (template)‐molten (dopants) reaction to synthesize Bi‐ and Rh‐codoped SrTiO3 (SrTiO3:Bi,Rh) particles. Our investigation reveals that SrTiO3:Bi,Rh manifests as single‐crystalline particles in a core (undoped)/shell (doped) structure. Furthermore, it exhibits a well‐stabilized Rh3+ energy state for visible‐light response without introducing undesirable trapping states. This precisely engineered structure and electronic configuration promoted the generation of high‐concentration and long‐lived free electrons, as well as facilitated their transfer to cocatalysts for H2 evolution. Impressively, SrTiO3:Bi,Rh achieved an exceptional apparent quantum yield (AQY) of 18.9% at 420 nm, setting a new benchmark among Rh‐doped‐based SrTiO3 materials. Furthermore, when integrated into an all‐solid‐state Z‐scheme system with Mo‐doped BiVO4 and reduced graphene oxide, SrTiO3:Bi,Rh enabled water splitting with an AQY of 7.1% at 420 nm. This work underscores the significance of simultaneous structural and electronic engineering and introduces the solid‐molten reaction as a viable approach for this purpose.</jats:p>

DOI： 10.1002/anie.202414628

Nonfullerene Acceptors Bearing Spiro-Substituted Bithiophene Units in Organic Solar Cells: Tuning the Frontier Molecular Orbital Distribution to Reduce Exciton Binding Energy. Reviewed International journal

Kai Wang, Seihou Jinnai, Takumi Urakami, Hirofumi Sato, Masahiro Higashi, Sota Tsujimura, Yasuhiro Kobori, Rintaro Adachi, Akira Yamakata, Yutaka Ie

Angewandte Chemie (International ed. in English) e202412691 2024.8

Language：English Publishing type：Research paper (scientific journal)

The development of nonfullerene acceptors (NFAs), represented by ITIC, has contributed to improving the power conversion efficiency (PCE) of organic solar cells (OSCs). Although tuning the electronic structures to reduce the exciton binding energy (Eb) is considered to promote photocharge generation, a rational molecular design for NFAs has not been established. In this study, we designed and developed two ITIC-based NFAs bearing spiro-substituted bithiophene or biphenyl units (named SpiroT-DCI and SpiroF-DCI) to tune the frontier molecular orbital (FMO) distribution of NFAs. While the highest occupied molecular orbitals (HOMOs) of SpiroF-DCI and ITIC are delocalized in the main π-conjugated framework, the HOMO of SpiroT-DCI is distributed on the bithiophene unit. Reflecting this difference, SpiroT-DCI exhibits a smaller Eb than either SpiroF-DCI or ITIC, and exhibits greater external quantum efficiency in single-component OSCs. Furthermore, SpiroT-DCI shows improved PCEs for bulk-heterojunction OSCs with a donor of PBDB-T, compared with that of either SpiroT-DCI or ITIC. Time-resolved spectroscopy measurements show that the photo-induced intermolecular charge separation is effective even in pristine SpiroT-DCI films. This study highlights the introduction of spiro-substituted bithiophene units that are effective in tuning the FMOs of ITIC, which is desirable for reducing the Eb and improving the PCE in OSCs.

DOI： 10.1002/anie.202412691

Development of Non-Fullerene Acceptors with π-Extended Central Unit for Organic Photovoltaic Devices Reviewed

Tomokazu Umeyama, Motohisa Kubota, Haoxuan Zhang, Rintaro Adachi, Akira Yamakata, Tomoyuki Koganezawa, Hiroshi Imahori

Journal of Photopolymer Science and Technology 37 ( 2 ) 197 - 204 2024.6

Atomically dispersed low-valent Au boosts photocatalytic hydroxyl radical production Reviewed

Zhenyuan Teng, Hongbin Yang, Qitao Zhang, Wenan Cai, Ying-Rui Lu, Kosaku Kato, Zhenzong Zhang, Jie Ding, Han Sun, Sixiao Liu, Chengyin Wang, Peng Chen, Akira Yamakata, Ting-Shan Chan, Chenliang Su, Teruhisa Ohno, Bin Liu

Nature Chemistry 16 ( 8 ) 1250 - 1260 2024.6

Double‐Hollow Au@CdS Yolk@Shell Nanostructures as Superior Plasmonic Photocatalysts for Solar Hydrogen Production Reviewed

Yi‐An Chen, Yuhi Nakayasu, Yu‐Chang Lin, Jui‐Cheng Kao, Kai‐Chi Hsiao, Quang‐Tuyen Le, Kao‐Der Chang, Ming‐Chung Wu, Jyh‐Pin Chou, Chun‐Wei Pao, Tso‐Fu Mark Chang, Masato Sone, Chun‐Yi Chen, Yu‐Chieh Lo, Yan‐Gu Lin, Akira Yamakata, Yung‐Jung Hsu

Advanced Functional Materials 2024.6

Authorship：Corresponding author Publishing type：Research paper (scientific journal) Publisher：Wiley

Abstract

Structural engineering has proven effective in tailoring the photocatalytic properties of semiconductor nanostructures. In this work, a sophisticated double‐hollow yolk@shell nanostructure composed of a plasmonic, mobile, hollow Au nanosphere (HGN) yolk and a permeable, hollow CdS shell is proposed to achieve remarkable solar hydrogen production. The shell thickness of HGN@CdS is finely adjusted from 7.7, 18.4 to 24.5 nm to investigate its influence on the photocatalytic performance. Compared with pure HGN, pure CdS, a physical mixture of HGN and CdS, and a counterpart single‐hollow cit‐Au@CdS yolk@shell nanostructure, HGN@CdS exhibits superior hydrogen production under visible light illumination (λ = 400–700 nm). The apparent quantum yield of hydrogen production reaches 8.2% at 320 nm, 6.2% at 420 nm, and 4.4% at 660 nm. The plasmon‐enhanced activity at 660 nm is exceptional, surpassing the plasmon‐induced photoactivities of the state‐of‐the‐art plasmonic photocatalysts ever reported. The superiority of HGN@CdS originates from the creation of charge separation state at HGN/CdS heterojunction, the considerably long‐lived hot electrons of plasmonic HGN, the magnified electric field, and the advantageous features of double‐hollow yolk@shell nanostructures. The findings can provide a guideline for the rational design of versatile double‐hollow yolk@shell nanostructures for widespread photocatalytic applications.

DOI： 10.1002/adfm.202402392

Carbon Nanotubes as a Solid-State Electron Mediator for Visible-Light-Driven Z-Scheme Overall Water Splitting Reviewed

Lihua Lin, Yiwen Ma, Nobuyuki Zettsu, Junie Jhon M. Vequizo, Chen Gu, Akira Yamakata, Takashi Hisatomi, Tsuyoshi Takata, Kazunari Domen

Journal of the American Chemical Society 146 ( 21 ) 14829 - 14834 2024.5

Trapping of Intermediates of a Photocatalytic Oxygen Evolution Reaction in Overall Water Splitting Reviewed

Fumiaki Amano, Satoshi Nakayama, Souta Suzuki, Akira Yamakata, Kosuke Beppu

ACS Applied Energy Materials 2024.2

Double Hydrogen Atom Transfer Strategy for Catalytic Acceptorless Dehydrogenation of Cycloalkanes Reviewed

Rahul Jagtap, Yuki Nishioka, Stephen Geddis, Yu Irie, Fuki Masaaki, Yasuhiro Kobori, Rintaro Adachi, Akira Yamakata, Harunobu Mitsunuma, Motomu Kanai

2024.2

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

The advancement of an effective hydrogen liberation tech-nology from liquid organic hydrogen carriers (LOHCs), such as cyclohexane and methylcyclohexane (MCH), holds significance in realizing a hydrogen-centric society. However, the attainment of homogeneous catalytic acceptorless dehydrogenation (CAD) characterized by elevated selectivity for thorough aromatization under mild conditions remains unrealized. In this study, a catalyst system, facilitated by a double hydrogen atom transfer (HAT) processes, has been devised for the CAD of inert cycloalkanes at ambient temperature under visible light irradiation. Through the synergistic utilization of tetrabutylammonium chloride (TBACl) and thiophosphoric acid (TPA) HAT catalysts, successful CAD with comprehensive aromatization has been accomplished with high functional group tolerance.

DOI： 10.26434/chemrxiv-2024-s5n5v

Suppression of Charge Recombination by Vertical Arrangement of A Donor Moiety on Flat Planar Dyes for Efficient Dye‐Sensitized Solar Cells Reviewed

Qi Guo, Tomohiro Higashino, Rintaro Adachi, Chayanit Wechwithayakhlung, Daniel Packwood, Akira Yamakata, Hiroshi Imahori

ChemSusChem 17 ( 9 ) 2024.1

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Abstract

In dye‐sensitized solar cells (DSSCs), flat planar dyes (e. g., highly light‐harvesting porphyrins and corroles) with multiple anchoring groups are known to adopt a horizontal orientation on TiO₂ through the multiple binding to TiO₂. Due to the strong electronic coupling between the dye and TiO₂, fast charge recombination between the oxidized dye and an electron in TiO₂ occurs, lowering the power conversion efficiency (η). To overcome this situation, an additional donor moiety can be placed on top of the planar dye on TiO₂ to slow down the undesirable charge recombination. Here we report the synthesis and photovoltaic properties of a triarylamine (TAA)‐tethered gold(III) corrole (TAA‐AuCor). The DSSC with TAA‐AuCor using iodine redox shuttle exhibited the highest η‐value among corrole‐based DSSCs, which is much higher than that with the reference AuCor. The transient absorption spectroscopies clearly demonstrated that fast electron transfer from the TAA moiety to the corrole radical cation in TAA‐AuCor competes with the undesirable charge recombination to generate long‐lived charge separated state TAA⋅⁺‐Cor/TiO₂⋅⁻ efficiently. Consequently, the introduction of the TAA moiety enhanced the η‐value remarkably, demonstrating the usefulness of our new concept to manipulate charge‐separated states toward highly efficient DSSCs.

DOI： 10.1002/cssc.202301661

Efficient and stable visible-light-driven Z-scheme overall water splitting using an oxysulfide H2 evolution photocatalyst Reviewed

Lihua Lin, Yiwen Ma, Junie Jhon M. Vequizo, Mamiko Nakabayashi, Chen Gu, Xiaoping Tao, Hiroaki Yoshida, Yuriy Pihosh, Yuta Nishina, Akira Yamakata, Naoya Shibata, Takashi Hisatomi, Tsuyoshi Takata, Kazunari Domen

Nature Communications 15 ( 1 ) 2024.1

Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

So-called Z-scheme systems permit overall water splitting using narrow-bandgap photocatalysts. To boost the performance of such systems, it is necessary to enhance the intrinsic activities of the hydrogen evolution photocatalyst and oxygen evolution photocatalyst, promote electron transfer from the oxygen evolution photocatalyst to the hydrogen evolution photocatalyst, and suppress back reactions. The present work develop a high-performance oxysulfide photocatalyst, Sm₂Ti₂O₅S₂, as an hydrogen evolution photocatalyst for use in a Z-scheme overall water splitting system in combination with BiVO₄ as the oxygen evolution photocatalyst and reduced graphene oxide as the solid-state electron mediator. After surface modifications of the photocatalysts to promote charge separation and redox reactions, this system is able to split water into hydrogen and oxygen for more than 100 hours with a solar-to-hydrogen energy conversion efficiency of 0.22%. In contrast to many existing photocatalytic systems, the water splitting activity of the present system is only minimally reduced by increasing the background pressure to 90 kPa. These results suggest characteristics suitable for applications under practical operating conditions.

DOI： 10.1038/s41467-024-44706-4

Other Link： https://www.nature.com/articles/s41467-024-44706-4

An efficient particulate photocatalyst for overall water splitting based on scandium and magnesium co-doped strontium titanate Reviewed

Shigeru Ikeda, Riku Okamoto, Akira Kimura, Yuhi Nakayasu, Akira Yamakata, Ryota Tomizawa, Taizo Masuda, Koichiro Nakatani

Sustainable Energy & Fuels 8 ( 2 ) 202 - 209 2024

Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

A high photocatalytic performance for overall water splitting was demonstrated over a photocatalyst based on a magnesium and scandium co-doped strontium titanate particle composed of a cubic shape having a nanosized step structure on the edge of the particle.

DOI： 10.1039/d3se01408h

Activation of Nonoxide Photocatalyst Sheet Operable under Visible Light Irradiation up to 600 nm by Conductive Bilayer Reviewed

Swarnava Nandy, Hiroka Sandaiji, Shuji Sekimori, Junie Jhon M. Vequizo, Rhauane Almeida Galvão, Natsutogi Iwasa, Swapnil S. Karade, Mamiko Nakabayashi, Tsuyoshi Takata, Takashi Hisatomi, Akira Yamakata, Kazunari Domen

ACS Energy Letters 4708 - 4714 2024

Publishing type：Research paper (scientific journal)

Particulate photocatalyst sheets allow for scalable sunlight-driven overall water splitting. Photocatalyst sheets composed of doped-La5Ti2Cu0.9Ag0.1O7S5 (LTCA), gallium zinc oxynitride (GaN:ZnO), and Au as the hydrogen evolution photocatalyst, oxygen evolution photocatalyst, and conductor layer, respectively, are promising candidates because of their long absorption edge wavelengths (700 and 600 nm, respectively). However, the actual performance of this sheet has been poor due to the large Schottky barrier at the GaN:ZnO/Au interface. Here, we developed a photocatalyst sheet incorporating conductive thin Au and thick Ti bilayer films having high and low work functions, respectively, which increased the activity by a factor of 6 compared with that of a single Au layer sheet. An optimized doped-LTCA/Au/Ti/CoOx/GaN:ZnO sheet modified with CoOx and Cr2O3/Rh cocatalysts exhibited a solar-to-hydrogen energy conversion efficiency of 0.3%. This work provides a key strategy based on the utilization of narrow bandgap oxynitride materials to construct efficient visible-light-driven nonoxide-based sheets.

DOI： 10.1021/acsenergylett.4c01795

Boosting charge separation in organic photovoltaics: unveiling dipole moment variations in excited non-fullerene acceptor layers Reviewed

Akira Yamakata, Kosaku Kato, Takumi Urakami, Sota Tsujimura, Kasumi Murayama, Masahiro Higashi, Hirofumi Sato, Yasuhiro Kobori, Tomokazu Umeyama, Hiroshi Imahori

Chemical Science 15 ( 32 ) 12686 - 12694 2024

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

Neat ITIC films are found to facilitate charge transfer, dissociation, and free carrier formation without the need for donor layers. This process, driven by V-type molecular stacking, significantly boosts organic photovoltaic efficiency.

DOI： 10.1039/d4sc00917g

Sub-50 nm perovskite-type tantalum-based oxynitride single crystals with enhanced photoactivity for water splitting Reviewed

Jiadong Xiao, Mamiko Nakabayashi, Takashi Hisatomi, Junie Jhon M. Vequizo, Wenpeng Li, Kaihong Chen, Xiaoping Tao, Akira Yamakata, Naoya Shibata, Tsuyoshi Takata, Yasunobu Inoue, Kazunari Domen

Nature Communications 14 ( 1 ) 2023.12

Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

A long-standing trade-off exists between improving crystallinity and minimizing particle size in the synthesis of perovskite-type transition-metal oxynitride photocatalysts via the thermal nitridation of commonly used metal oxide and carbonate precursors. Here, we overcome this limitation to fabricate ATaO₂N (A = Sr, Ca, Ba) single nanocrystals with particle sizes of several tens of nanometers, excellent crystallinity and tunable long-wavelength response via thermal nitridation of mixtures of tantalum disulfide, metal hydroxides (A(OH)₂), and molten-salt fluxes (e.g., SrCl₂) as precursors. The SrTaO₂N nanocrystals modified with a tailored Ir–Pt alloy@Cr₂O₃ cocatalyst evolved H₂ around two orders of magnitude more efficiently than the previously reported SrTaO₂N photocatalysts, with a record solar-to-hydrogen energy conversion efficiency of 0.15% for SrTaO₂N in Z-scheme water splitting. Our findings enable the synthesis of perovskite-type transition-metal oxynitride nanocrystals by thermal nitridation and pave the way for manufacturing advanced long-wavelength-responsive particulate photocatalysts for efficient solar energy conversion.

DOI： 10.1038/s41467-023-43838-3

Other Link： https://www.nature.com/articles/s41467-023-43838-3

A Quantitative Study on the Relationship of Specific Surface Area and Carrier Lifetime to Photocatalytic Activity of Anatase TiO₂ Nanoparticles Reviewed

Shimpei Naniwa, Kosaku Kato, Akira Yamakata, Akira Yamamoto, Hisao Yoshida

ACS Catalysis 13 ( 22 ) 15212 - 15218 2023.11

Photocatalytic Hydrogen Evolution Activity of Nitrogen/Fluorine-Codoped Rutile TiO₂ Reviewed

Akinobu Miyoshi, Megumi Okazaki, Kosaku Kato, Tomoki Kanazawa, Toshiyuki Yokoi, Shunta Nishioka, Shunsuke Nozawa, Akira Yamakata, Kazuhiko Maeda

ACS Omega 8 ( 44 ) 41809 - 41815 2023.10

In situ surface-enhanced infrared absorption analysis of the excited carrier transfer from n-type Si photoelectrode to Pt oxygen evolution cocatalyst by probing adsorbed CO molecules Reviewed

Shu Ashimura, Reiya Konaka, Taki Suginaga, Kazuki Harada, Akira Yamakata, Chechia Hu, Hepsiba Niruba Catherine, Ke-Hsuan Wang, Takeshi Kawai, Masaaki Yoshida

Journal of the Taiwan Institute of Chemical Engineers 105121 - 105121 2023.9

Unfolding the Impact of H<inf>2</inf>-Reduction Treatment in Enhancing the Photocatalytic Activity of Rutile TiO<inf>2</inf> Based on Photocarriers Dynamics Invited Reviewed

Junie Jhon M. Vequizo, Kosaku Kato, Fumiaki Amano, Akira Yamakata

Journal of Physical Chemistry C 127 ( 22 ) 10411 - 10418 2023.6

Authorship：Corresponding author Publishing type：Research paper (scientific journal)

In the pursuit of efficient titania photocatalysts for water splitting, several strategies have been employed. One of these is reduction of titania (TiO2) via treatment under hydrogen atmosphere, a promising technique to improve the photocatalytic performance. It has been proposed that electron injection induced by reduction on TiO2 demonstrated an improved photocatalytic activity. However, the dynamical processes involving the photogenerated charge carriers in reduced TiO2 have not been fully explored and understood yet. In this work, we employ time-resolved absorption spectroscopy (TAS) and photoluminescence (PL) measurements to unravel the impact of H2 reduction treatment on the photocarriers in rutile TiO2 (R-TiO2). TAS results revealed that the photoexcited electrons are preferentially filling the shallower trap states of reduced R-TiO2, with the lowest energy limit of ∼0.25 eV below the conduction band minimum, much shallower than that of nonreduced R-TiO2 (∼0.62 eV). Furthermore, these favorable effects of H2-reduction resulted in notable increase of long-lived shallow-trapped electrons, substantially extending the lifetimes of electrons and holes. PL measurements strongly support the positive impact of H2 reduction treatment: the NIR emission (∼850 nm) is largely quenched, indicating that the radiative recombination of deep trapped electrons and holes is significantly reduced. The combined PL and TAS results shed light on the impact of H2 reduction on R-TiO2, and this strategy can be potentially useful for further development of other photocatalytic materials.

DOI： 10.1021/acs.jpcc.3c00855

Metal Single‐Atom Cocatalyst on Carbon Nitride for the Photocatalytic Hydrogen Evolution Reaction: Effects of Metal Species Reviewed

Yuki Akinaga, Tokuhisa Kawawaki, Hinano Kameko, Yuki Yamazaki, Kenji Yamazaki, Yuhi Nakayasu, Kosaku Kato, Yuto Tanaka, Adie Tri Hanindriyo, Makito Takagi, Tomomi Shimazaki, Masanori Tachikawa, Akira Yamakata, Yuichi Negishi

Advanced Functional Materials 33 ( 33 ) 2023.5

Publishing type：Research paper (scientific journal) Publisher：Wiley

Abstract

Single‐atom (SA) catalysts exhibit high activity in various reactions because there are no inactive internal atoms. Accordingly, SA cocatalysts are also an active research fields regarding photocatalytic hydrogen (H₂) evolution which can be generated by abundant water and sunlight. Herein, it is investigated whether 10 transition metal elements can work as an SA on graphitic carbon nitride (g‐C₃N₄; i.e., gCN), a promising visible‐light‐driven photocatalyst. A method is established to prepare SA‐loaded gCN at high loadings (weight of ≈3 wt.% for Cu, Ni, Pd, Pt, Rh, and Ru) by modulating the photoreduction power. Regarding Au and Ag, SAs are formed with difficulty without aggregation because of the low binding energy between gCN and the SA. An evaluation of the photocatalytic H₂‐evolution activity of the prepared metal SA‐loaded gCN reveals that Pd, Pt, and Rh SA‐loaded gCN exhibits relatively high H₂‐evolution efficiency per SA. Transient absorption spectroscopy and electrochemical measurements reveal the following: i) Pd SA‐loaded gCN exhibits a particularly suitable electronic structure for proton adsorption and ii) therefore they exhibit the highest H₂‐evolution efficiency per SA than other metal SA‐loaded gCN. Finally, the 8.6 times higher H₂‐evolution rate per active site of Pd SA is achieved than that of Pd‐nanoparticles cocatalyst.

DOI： 10.1002/adfm.202303321

Improved Photocatalytic O2 Evolution on a Sillén–Aurivillius Perovskite Oxychloride Bi6NbWO14Cl by Rh2O3 Additives and Surface Modifications Invited Reviewed

Hajime Suzuki, Takanori Takashima, Osamu Tomita, Tomoki Kanazawa, Shunsuke Nozawa, Kosaku Kato, Akira Yamakata, Kouichi Nakashima, Akinori Saeki, Ryu Abe

The Journal of Physical Chemistry C 127 ( 17 ) 7965 - 7973 2023.5

Co-doping of a La5Ti2Cu0.9Ag0.1O7S5 photocatalyst (λ < 700 nm) with Ga and Al to enhance photocatalytic H2 evolution Reviewed International journal

Xiaojun Wang, Zhenhua Pan, Junie Jhon, M. Vequizo, Takashi Hisatomi, Swarnava Nandy, Tomohiro Higashi, Lihua Lin, Jiadong Xiao, Tsuyoshi Takata, Akira Yamakata, Wei Yan, Kazunari Domen

Chemical communications (Cambridge, England) 59 ( 45 ) 6913 - 6916 2023.5

Language：English Publishing type：Research paper (scientific journal)

La5Ti2Cu0.9Ag0.1O7S5 (LTCA) (λ < 700 nm) can function as a photocatalyst for H2 evolution. Co-doping LTCA with Ga3+ and Al3+ at Ti4+ sites effectively enhanced the H2 evolution activity of LTCA, yielding an apparent quantum efficiency of 18% at 420 nm. The activity of this material was greater than that previously reported for Ga-doped LTCA by a factor of 1.6. Such activity enhancement is attributed to increasing the population of long-lived photogenerated electrons and facilitating the electron transfer to the cocatalyst. This work significantly improved the LTCA-based photocatalyst for H2 evolution, making it a promising material for future application in non-sacrificial Z-scheme water splitting.

DOI： 10.1039/D3CC01863F

Carbon Nitride Loaded with an Ultrafine, Monodisperse, Metallic Platinum‐Cluster Cocatalyst for the Photocatalytic Hydrogen‐Evolution Reaction Reviewed

Daichi Yazaki, Tokuhisa Kawawaki, Daisuke Hirayama, Masanobu Kawachi, Kosaku Kato, Sota Oguchi, Yuichi Yamaguchi, Soichi Kikkawa, Yoshiya Ueki, Sakiat Hossain, D. J. Osborn, Fumihiko Ozaki, Shunsuke Tanaka, Jun Yoshinobu, Gregory F. Metha, Seiji Yamazoe, Akihiko Kudo, Akira Yamakata, Yuichi Negishi

Small 19 ( 34 ) 2208287 2023.4

Publishing type：Research paper (scientific journal) Publisher：Wiley

Abstract

For the realization of a next‐generation energy society, further improvement in the activity of water‐splitting photocatalysts is essential. Platinum (Pt) is predicted to be the most effective cocatalyst for hydrogen evolution from water. However, when the number of active sites is increased by decreasing the particle size, the Pt cocatalyst is easily oxidized and thereby loses its activity. In this study, a method to load ultrafine, monodisperse, metallic Pt nanoclusters (NCs) on graphitic carbon nitride is developed, which is a promising visible‐light‐driven photocatalyst. In this photocatalyst, a part of the surface of the Pt NCs is protected by sulfur atoms, preventing oxidation. Consequently, the hydrogen‐evolution activity per loading weight of Pt cocatalyst is significantly improved, 53 times, compared with that of a Pt‐cocatalyst loaded photocatalyst by the conventional method. The developed method is also effective to enhance the overall water‐splitting activity of other advanced photocatalysts such as SrTiO₃ and BaLa₄Ti₄O₁₅.

DOI： 10.1002/smll.202208287

Synthesis of crystal-phase and color tunable mixed anion co-doped titanium oxides and their controllable photocatalytic activity Reviewed

Jingdi Cao, Takuya Hhasegawa, Yusuke Asakura, Akira Yamakata, Peng Sun, Wenbin Cao, Shu Yin

International Journal of Minerals, Metallurgy and Materials 30 ( 10 ) 2036 - 2043 2023.4

Asymmetrically coordinated cobalt single atom on carbon nitride for highly selective photocatalytic oxidation of CH4 to CH3OH Reviewed

Jie Ding, Zhenyuan Teng, Xiaozhi Su, Kosaku Kato, Yuhang Liu, Ting Xiao, Wei Liu, Lingyue Liu, Qiao Zhang, Xinyi Ren, Jincheng Zhang, Zhaoyang Chen, Ohno Teruhisa, Akira Yamakata, Hongbin Yang, Yanqiang Huang, Bin Liu, Yueming Zhai

Chem 9 ( 4 ) 1017 - 1035 2023.4

Surface-Specific Modification of Graphitic Carbon Nitride by Plasma for Enhanced Durability and Selectivity of Photocatalytic CO2 Reduction with a Supramolecular Photocatalyst Reviewed

Noritaka Sakakibara, Mitsuhiko Shizuno, Tomoki Kanazawa, Kosaku Kato, Akira Yamakata, Shunsuke Nozawa, Tsuyohito Ito, Kazuo Terashima, Kazuhiko Maeda, Yusuke Tamaki, Osamu Ishitani

ACS Applied Materials & Interfaces 15 13025 - 13218 2023.3

Particle Size Dependent Trap States of Photoexcited Carriers in Anatase TiO2 Nanoparticles Invited Reviewed

Shimpei Naniwa, Kosaku Kato, Akira Yamamoto, Hisao Yoshida, Akira Yamakata

The Journal of Physical Chemistry C 127 ( 8 ) 4295 - 4302 2023.3

Promoted Utilization of Charge Carriers in La₅Ti₂Cu_0.9Ag_0.1O₇S₅-Based Photocatalyst Sheets for Efficient Z-Scheme Overall Water Splitting Reviewed

Shanshan Chen, Swarnava Nandy, Junie Jhon M. Vequizo, Takashi Hisatomi, Mamiko Nakabayashi, Zhenhua Pan, Qi Xiao, Zheng Wang, Lihua Lin, Song Sun, Kosaku Kato, Akira Yamakata, Naoya Shibata, Tsuyoshi Takata, Fuxiang Zhang, Kazunari Domen

ACS Catalysis 13 ( 5 ) 3285 - 3294 2023.2

Overall Water Splitting by a SrTaO₂N-Based Photocatalyst Decorated with an Ir-Promoted Ru-Based Cocatalyst Reviewed

Kaihong Chen, Jiadong Xiao, Junie Jhon M. Vequizo, Takashi Hisatomi, Yiwen Ma, Mamiko Nakabayashi, Tsuyoshi Takata, Akira Yamakata, Naoya Shibata, Kazunari Domen

Journal of the American Chemical Society 145 ( 7 ) 3839 - 3843 2023.1

Zr-doped BaTaO₂N photocatalyst modified with Na–Pt cocatalyst for efficient hydrogen evolution and Z-scheme water splitting Reviewed

Huihui Li, Junie Jhon M. Vequizo, Takashi Hisatomi, Mamiko Nakabayashi, Jiadong Xiao, Xiaoping Tao, Zhenhua Pan, Wenpeng Li, Shanshan Chen, Zheng Wang, Naoya Shibata, Akira Yamakata, Tsuyoshi Takata, Kazunari Domen

EES Catalysis 1 26 - 35 2023.1

Active BaTaO2N Photocatalysts Prepared from Amorphous Ta2O5 Precursor for Overall Water Splitting under Visible Light Reviewed

Shinji Nishimae, Junie Jhon M. Vequizo, Yasunobu Inoue, Akira Yamakata, Mamiko Nakabayashi, Tomohiro Higashi, Kazunari Domen

Journal of Materials Chemistry A 11 6299 - 6310 2023

Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

Barium tantalum oxynitride (BaTaO2N), a photocatalyst active during one-step-excitation overall water splitting under visible light, was synthesized by NH3-based nitridation of a mixture of BaCO3 and amorphous Ta2O53H2O. H2 and...

DOI： 10.1039/d2ta10010j

An unexplored role of the CrO_x shell in an elaborated Rh/CrO_x core–shell cocatalyst for photocatalytic water splitting: a selective electron transport pathway from semiconductors to core metals, boosting charge separation and H₂ evolution Reviewed

Tetsu Kotani, Kanta Ogawa, Hajime Suzuki, Kosaku Kato, Osamu Tomita, Akira Yamakata, Ryu Abe

EES Catalysis 1 ( 3 ) 255 - 262 2023

An emissive charge-transfer excited-state at the well-defined hetero-nanostructure interface of an organic conjugated molecule and two-dimensional inorganic nanosheet Reviewed

Tomokazu Umeyama, Daizu Mizutani, Yuki Ikeda, W. Ryan Osterloh, Futa Yamamoto, Kosaku Kato, Akira Yamakata, Masahiro Higashi, Takumi Urakami, Hirofumi Sato, Hiroshi Imahori

Chemical Science 14 ( 42 ) 11914 - 11923 2023

A general interfacial-energetics-tuning strategy for enhanced artificial photosynthesis Reviewed

Tian Liu, Zhenhua Pan, Kosaku Kato, Junie Jhon M. Vequizo, Rito Yanagi, Xiaoshan Zheng, Weilai Yu, Akira Yamakata, Baoliang Chen, Shu Hu, Kenji Katayama, Chiheng Chu

Nature Communications 13 ( 1 ) 7783 2022.12

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

The demands for cost-effective solar fuels have triggered extensive research in artificial photosynthesis, yet the efforts in designing high-performance particulate photocatalysts are largely impeded by inefficient charge separation. Because charge separation in a particulate photocatalyst is driven by asymmetric interfacial energetics between its reduction and oxidation sites, enhancing this process demands nanoscale tuning of interfacial energetics on the prerequisite of not impairing the kinetics and selectivity for surface reactions. In this study, we realize this target with a general strategy involving the application of a core/shell type cocatalyst that is demonstrated on various photocatalytic systems. The promising H₂O₂ generation efficiency validate our perspective on tuning interfacial energetics for enhanced charge separation and photosynthesis performance. Particularly, this strategy is highlighted on a BiVO₄ system for overall H₂O₂ photosynthesis with a solar-to-H₂O₂ conversion of 0.73%.

DOI： 10.1038/s41467-022-35502-z

Other Link： https://www.nature.com/articles/s41467-022-35502-z

Harnessing infrared solar energy with plasmonic energy upconversion (Oct, 10.1038/s41893-022-01015-2, 2022) Reviewed

Zichao Lian, Yoichi Kobayashi, Junie Jhon M. Vequizo, Chandana Sampath Kumara Ranasinghe, Akira Yamakata, Takuro Nagai, Koji Kimoto, Katsuaki Kobayashi, Koji Tanaka, Toshiharu Teranishi, Masanori Sakamoto

NATURE SUSTAINABILITY 5 1092 - 1099 2022.11

Effects of Hydroxy Groups in Anthraquinone Dyes on Photocatalytic Activity of Visible-light-sensitized Pt-TiO2 for Hydrogen Evolution Reviewed

Fumiaki Amano, Yasukazu Akaki, Akira Yamakata

Catalysis Surveys from Asia 27 ( 1 ) 75 - 83 2022.10

固体表面の動力学に追る時間分解中赤外分光 Invited Reviewed

山方啓, 加藤康作

光学 51 448 - 454 2022.10

Effects of a Nanoparticulate TiO2 Modifier on the Visible-Light CO2 Reduction Performance of a Metal-Complex/Semiconductor Hybrid Photocatalyst Reviewed

Mitsuhiko Shizuno, Kosaku Kato, Shunta Nishioka, Tomoki Kanazawa, Daiki Saito, Shunsuke Nozawa, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda

ACS Applied Energy Materials 5 ( 8 ) 9479 - 9486 2022.8

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society ({ACS})

Graphitic carbon nitride nanosheets (NS-C3N4) combined with a binuclear Ru(II)-Re(I) complex (RuRe) consisting of a photosensitizer and catalytic units are capable of selectively reducing CO2 to CO under visible light (lambda > 400 nm) using triethanolamine as an electron donor. In this system, the grafting of the nanoparticulate rutile TiO2 on the NS-C3N4 surface has previously been shown to enhance photocatalytic performance because of improved charge separation between the NS-C3N4 and the TiO2 and the reinforced adsorption of the RuRe. Here, a more detailed investigation of various polymorphic TiO2 species loaded onto the NS-C3N4 and the visible-light CO2 reduction activity of the resultant photocatalysts was conducted. The experimental results showed that the RuRe/anatase-TiO2/NS-C3N4 outperformed analogues with other TiO2 polymorphs in terms of the CO generation rate, with a maximum catalytic turnover number of similar to 100. Transient absorption and emission spectroscopy measurements were carried out to clarify the origin of the different CO evolution activities provided by different TiO2 modifiers. The results revealed that the TiO2 modifiers not only affected the charge separation ability but also controlled the efficiency of back electron transfer from the Ru-photosensitizer unit in the RuRe to the TiO2. The results also showed that, among the investigated TiO2 polymorphs, anatase best facilitated the forward electron transfer from the NS-C3N4 to the TiO2 while suppressing the undesirable back electron transfer reaction.

DOI： 10.1021/acsaem.2c01052

One-Step Excitation Overall Water Splitting over a Modified Mg-Doped BaTaO2N Photocatalyst Reviewed

Huihui Li, Jiadong Xiao, Junie Jhon M. Vequizo, Takashi Hisatomi, Mamiko Nakabayashi, Zhenhua Pan, Naoya Shibata, Akira Yamakata, Tsuyoshi Takata, Kazunari Domen

ACS Catalysis 12 ( 16 ) 10179 - 10185 2022.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

BaTaO2N responds to visible light up to 650 nm and exhibits photocatalytic activity during the hydrogen and oxygen evolution reactions. However, the difficulty in promoting both processes simultaneously hinders the realization of overall water splitting (OWS) over this material. Herein, we demonstrate the activation and stabilization of BaTaO2N-based photocatalysts for visible-light-driven OWS by combining flux-assisted nitridation with Mg doping and co-loading of Cr2O3/(Na)Rh and IrO2 co-catalysts. RbCl-assisted nitridation produced single-crystal BaTaO2N particles doped with Mg and so promoted charge transfer to the co-catalysts. The coloading of Cr2O3/(Na)Rh and IrO2 at moderate temperatures as co-catalysts to promote the hydrogen and oxygen evolution reactions, respectively, allowed the BaTaO2N photocatalyst to evolve hydrogen and oxygen simultaneously from water. This work highlights the importance of carefully tuning semiconducting and catalytic properties to realize effective charge transfer when preparing narrow-bandgap oxynitrides for OWS.

DOI： 10.1021/acscatal.2c02394

Effect of Surface Plasmon Resonance and the Heterojunction on Photoelectrochemical Activity of Metal-Loaded TiO2 Electrodes under Visible Light Irradiation Reviewed

Chia-Yu Chang, Akira Yamakata, Wenjea J. Tseng

The Journal of Physical Chemistry C 126 12450 - 12459 2022.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

This study examines the influence of surface plasmon resonance (SPR) and the semiconducting heterojunction on the photoelectrochemical (PEC) activity of metal-loaded TiO2 electrodes under visible light irradiation. Different metal nanoparticles (including Au, Ag, Rh, and Cu) have been selected deliberately and deposited on the TiO2 electrode layers via photodeposition and subsequent annealing at 300 degrees C. UV-vis spectra show an increased absorbance in the visible light region with the metal loading. X-ray photon spectroscopy reveals the formation of CuO, Ag2O, and Ru2O3 after annealing, while only Au remains in its metallic state. The PEC activity increases in the ascending order of Cu < Au < Rh < Ag. This is consistent with the electrochemical impedance measurement where the Ag-loaded TiO2 electrode shows the lowest charge transfer resistance together with the highest ion diffusion rate. Our findings suggest that the presence of semiconducting p-n heterojunctions with associated oxygen-vacancy defects facilitates the enhanced PEC activity by reducing the electron-hole recombination in addition to the SPR effect.

DOI： 10.1021/acs.jpcc.2c02649

Eliciting the contribution of TiN to photoelectrochemical performance enhancement of Imma-LaTiO2N at neutral pH Invited Reviewed

Mirabbos Hojamberdiev, Juan Manuel Mora-Hernandez, Ronald Vargas, Eva Maria Heppke, Kunio Yubuta, Akira Yamakata, Zukhra Kadirova, Leticia Torres-Martinez, Katsuya Teshima, Martin Lerch

MATERIALS TODAY ENERGY 27 2022.7

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD

The presence of defects, which act as the recombination hubs for photogenerated charge carriers, hinders the improvement of photocatalytic activity for oxygen evolution reaction of LaTiO2N under visible light irradiation via a four-electron-transfer reaction pathway. Here, we involve titanium nitride (TiN) in a varying content (0e17.8%) to improve the efficiency of charge separation and transport, influencing the photoelectrochemical performance of LaTiO2N. The characterization results confirm the formation of a strong contact between orthorhombic-LaTiO2N and cubic-TiN particles. The photoelectrochemical (PEC) measurements reveal the inverse dependence between electron transfer phenomena and charge carrier recombination, which allows to understand the trend when modifying LaTiO2N with TiN. In fact, the incorporation of 17.8% TiN in the LaTiO2N:TiN material results in a higher photocurrent. Open-circuit potential (OCP) decay and transient absorption spectroscopy (TAS) studies confirm longer lifetimes of charge carriers for increasing amounts of TiN in the synthesized materials. Thus, the main role of TiN is to improve the properties of the semiconductor-electrolyte interface, having verified its impact on the separation and transport of photogenerated charge carriers. Furthermore, computational studies predict that the adsorption of water molecules is favored at the LaTiO2N:TiN surface compared to the individual TiN and LaTiO2N surfaces. (C) 2022 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.mtener.2022.101053

Role of Oxygen Vacancy in the Photocarrier Dynamics of WO3 Photocatalysts: The Case of Recombination Centers Reviewed

Kosaku Kato, Yohei Uemura, Kiyotaka Asakura, Akira Yamakata

The Journal of Physical Chemistry C 126 ( 22 ) 9257 - 9263 2022.6

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society ({ACS})

Defects in powder photocatalysts determine the photocatalytic activity. The addition of defects sometimes enhances the activity, but sometimes decreases it. However, the factors determining the difference between these cases have not been fully elucidated yet. Herein, we investigated the effects of oxygen vacancies on photocarrier dynamics in WO3 powder using broadband transient absorption spectroscopy. It was found that the decay of deeply trapped electrons was accelerated when the number of oxygen vacancies was increased by H-2 reduction. This result suggests that oxygen vacancies in WO3 mainly act as recombination centers. This is in contrast to many other photocatalysts such as TiO2 and SrTiO3, where the carrier lifetime increases with increasing oxygen vacancy concentration. These differences can be attributed to the difference in the distance between oxygen vacancies. When defects are dispersed, trapped electrons need to travel over long distances by repeatedly hopping and tunneling between defects to combine with holes, resulting in decelerated recombination. In contrast, when the defects are connected or located close together, the trapped electrons can readily migrate among defects, leading to enhanced recombination. Control of the distance between defects is thus important for enhancing photocatalytic activity.

DOI： 10.1021/acs.jpcc.2c01662

Enhanced Overall Water Splitting by a Zirconium‐Doped TaON‐Based Photocatalyst Reviewed

Jiadong Xiao, Shinji Nishimae, Junie Jhon M. Vequizo, Mamiko Nakabayashi, Takashi Hisatomi, Huihui Li, Lihua Lin, Naoya Shibata, Akira Yamakata, Yasunobu Inoue, Kazunari Domen

Angewandte Chemie International Edition 61 ( 17 ) 2022.4

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-V C H VERLAG GMBH

Solar-powered one-step-excitation overall water splitting (OWS) using semiconducting materials is a simple means of achieving scalable and sustainable hydrogen production. While tantalum oxynitride (TaON) is one of the few photocatalysts capable of promoting OWS via single-step visible-light excitation, the efficiency of this process remains extremely poor. The present work employed 15 nm amorphous Ta2O5.3.3 H2O nanoparticles as a new precursor together with Zr doping and an optimized nitridation duration to synthesize a TaON-based photocatalyst with reduced particle sizes and low defect densities. Upon loading with Ru/Cr2O3/IrO2 cocatalysts, this material exhibited stoichiometric water splitting into hydrogen and oxygen, with an order of magnitude improvement in efficiency. Our findings demonstrate the importance of inventing/selecting the appropriate synthetic precursor and of defect control for fabricating active OWS photocatalysts.

DOI： 10.1002/anie.202116573

Identification of a Self-Photosensitizing Hydrogen Atom Transfer Organocatalyst System. Reviewed International journal

Hiromu Fuse, Yu Irie, Masaaki Fuki, Yasuhiro Kobori, Kosaku Kato, Akira Yamakata, Masahiro Higashi, Harunobu Mitsunuma, Motomu Kanai

Journal of the American Chemical Society 144 ( 14 ) 6566 - 6574 2022.4

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society ({ACS})

We developed organocatalyst systems to promote the cleavage of stable C-H bonds, such as formyl, α-hydroxy, and benzylic C-H bonds, through a hydrogen atom transfer (HAT) process without the use of exogenous photosensitizers. An electronically tuned thiophosphoric acid, 7,7'-OMe-TPA, was assembled with substrate or co-catalyst N-heteroaromatics through hydrogen bonding and π-π interactions to form electron donor-acceptor (EDA) complexes. Photoirradiation of the EDA complex induced stepwise, sequential single-electron transfer (SET) processes to generate a HAT-active thiyl radical. The first SET was from the electron-rich naphthyl group of 7,7'-OMe-TPA to the protonated N-heteroaromatics and the second proton-coupled SET (PCET) from the thiophosphoric acid moiety of 7,7'-OMe-TPA to the resulting naphthyl radical cation. Spectroscopic studies and theoretical calculations characterized the stepwise SET process mediated by short-lived intermediates. This organocatalytic HAT system was applied to four different carbon-hydrogen (C-H) functionalization reactions, hydroxyalkylation and alkylation of N-heteroaromatics, acceptorless dehydrogenation of alcohols, and benzylation of imines, with high functional group tolerance.

DOI： 10.1021/jacs.2c01705

時間分解分光計測を利用した光触媒反応機構の解明 Invited Reviewed

山方啓

分光研究 71 75 - 89 2022.4

Donor-π-Acceptor Type Porphyrin-Fullerene Dyad with Acetylene Bridge for p-Type Dye-sensitized Solar Cell Reviewed

Qi Guo, Tomohiro Higashino, Kosaku Kato, Akira Yamakata, Hiroshi Imahori

Chemistry Letters 51 ( 3 ) 260 - 263 2022.2

Authorship：Corresponding author Publishing type：Research paper (scientific journal) Publisher：Oxford University Press (OUP)

Abstract

Donor-π-acceptor type porphyrin-fullerene dyads with an acetylene bridge were designed and synthesized. The dyad was found to produce a charge-separated state with a lifetime of 0.42 µs and a quantum yield of 0.78 in benzonitrile. The p-type dye-sensitized solar cells with the dyad exhibited higher photovoltaic performance than that with the porphyrin reference without the fullerene moiety.

DOI： 10.1246/cl.210717

Manipulation of charge carrier flow in Bi4NbO8Cl nanoplate photocatalyst with metal loading Reviewed

Kanta Ogawa, Ryota Sakamoto, Chengchao Zhong, Hajime Suzuki, Kosaku Kato, Osamu Tomita, Kouichi Nakashima, Akira Yamakata, Takashi Tachikawa, Akinori Saeki, Hiroshi Kageyama, Ryu Abe

Chemical Science 13 ( 11 ) 3118 - 3128 2022.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

Separation of photoexcited charge carriers in semiconductors is important for efficient solar energy conversion and yet the control strategies and underlying mechanisms are not fully established. Although layered compounds have...

DOI： 10.1039/d1sc06054f

Unfolding the Role of B Site-Selective Doping of Aliovalent Cations on Enhancing Sacrificial Visible Light-Induced Photocatalytic H2 and O2 Evolution over BaTaO2N Reviewed

Mirabbos Hojamberdiev, Ronald Vargas, Zukhra C. Kadirova, Kosaku Kato, Hadi Sena, Aleksei G. Krasnov, Akira Yamakata, Katsuya Teshima, Martin Lerch

ACS Catalysis 12 ( 2 ) 1403 - 1414 2022.1

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

The doping of foreign cations and anions is one of the effective strategies for engineering defects and modulating the optical, electronic, and surface properties that directly govern the photo-catalytic O-2 and H-2 evolution reactions. BaTaO2N (BTON) is a promising 600 nm-class photocatalyst because of its absorption of visible light up to 660 nm, small band gap (E-g = 1.9 eV), appropriate valence band-edge position for oxygen evolution, good stability under light irradiation in concentrated alkaline solutions, and nontoxicity. Although the photocatalytic and photoelectrochemical water-splitting efficiencies of BaTaO2N have been progressively improved, it is still far from the requirements set for practical applications. Here, we employ a 5% B site-selective doping of aliovalent metal cations (Al3+, Ga3+, Mg2+, and Zr4+) to enhance sacrificial visible light-induced photocatalytic H-2 and O-2 evolution over BaTaO2N. The results of physicochemical characterizations reveal that no significant change in crystal structure, crystal morphology, and optical absorption edge is observed upon cation doping. Therefore, the difference observed in O-2 and H-2 evolution during the photocatalytic reactions over pristine and doped BaTaO2N photocatalysts is explained by examining optical, electronic, and surface properties. Also, molecular dynamics (MD) is used to gain insights into the respective effect of cation doping on adsorption energy of water molecules and formed intermediates (H* for H-2 evolution and HO*, O*, and HOO* for O-2 evolution) on the BaTaO2N surfaces terminated with TaO6, TaN6, and TaO4N2 octahedra. Finally, the experimental reaction rates for H-2 and O-2 evolution are correlated well using a linear energy-performance relationship, elucidating the doping and surface-termination trends observed in the BaTaO2N photocatalysts.

DOI： 10.1021/acscatal.1c04547

Overall photosynthesis of H2O2 by an inorganic semiconductor Reviewed

Pan Zhenhua, Junie Jhon, M. Vequizo, Kosaku Kato, Akira Yamakata, Kenji Katayama, Chiheng Chu, Kazunari Domen

Nature Communications 13 ( 1 ) 2022.1

Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PORTFOLIO

Artificial photosynthesis of H2O2 using earth-abundant water and oxygen is a promising approach to achieve scalable and cost-effective solar fuel production. Recent studies on this topic have made significant progress, yet are mainly focused on using organic polymers. This set of photocatalysts is susceptible to potent oxidants (e.g. hydroxyl radical) that are inevitably formed during H2O2 generation. Here, we report an inorganic Mo-doped faceted BiVO4 (Mo:BiVO4) system that is resistant to radical oxidation and exhibits a high overall H2O2 photosynthesis efficiency among inorganic photocatalysts, with an apparent quantum yield of 1.2% and a solar-to-chemical conversion efficiency of 0.29% at full spectrum, as well as an apparent quantum yield of 5.8% at 420 nm. The surface-reaction kinetics and selectivity of Mo:BiVO4 were tuned by precisely loading CoOx and Pd on {110} and {010} facets, respectively. Time-resolved spectroscopic investigations of photocarriers suggest that depositing select cocatalysts on distinct facet tailored the interfacial energetics between {110} and {010} facets and enhanced charge separation in Mo:BiVO4, therefore overcoming a key challenge in developing efficient inorganic photocatalysts. The promising H2O2 generation efficiency achieved by delicate design of catalyst spatial and electronic structures sheds light on applying robust inorganic particulate photocatalysts to artificial photosynthesis of H2O2.

DOI： 10.1038/s41467-022-28686-x

Improvement of Visible‐Light H2 Evolution Activity of Pb2Ti2O5.4F1.2 Photocatalyst by Coloading of Rh and Pd Cocatalysts Reviewed

Kenta Aihara, Kosaku Kato, Tomoki Uchiyama, Shuhei Yasuda, Toshiyuki Yokoi, Akira Yamakata, Yoshiharu Uchimoto, Kazuhiko Maeda

Chemistry - A European Journal 28 ( 43 ) 2022

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Pb2Ti2O5.4F1.2 modified with various metal cocatalysts was studied as a photocatalyst for visible-light H2 evolution. Although unmodified Pb2Ti2O5.4F1.2 showed negligible activity, modification of its surface with Rh led to the best observed promotional effect among the Pb2Ti2O5.4F1.2 samples modified with a single metal cocatalyst. The H2 evolution activity was further enhanced by coloading with Pd; the Rh−Pd/Pb2Ti2O5.4F1.2 photocatalyst showed 3.2 times greater activity than the previously reported Pt/Pb2Ti2O5.4F1.2. X-ray absorption fine-structure spectroscopy, photoelectrochemical, and transient absorption spectroscopy measurements indicated that the coloaded Rh and Pd species, which were partially alloyed on the Pb2Ti2O5.4F1.2 surface, improved the electron-capturing ability, thereby explaining the high activity of the coloaded Rh−Pd/Pb2Ti2O5.4F1.2 catalyst toward H2 evolution.

DOI： 10.1002/CHEM.202200875

Influences of pulverization and annealing treatment on the photocatalytic activity of BiVO₄ for oxygen evolution Reviewed

Kazuya Okuno, Hiromu Kumagai, Junie Jhon M. Vequizo, Kosaku Kato, Makoto Kobayashi, Akira Yamakata, Masato Kakihana, Hideki Kato

Sustainable Energy & Fuels 6 ( 7 ) 1698 - 1707 2022

Effects of the rigid and sterically bulky structure of non-fused nonfullerene acceptors on transient photon-to-current dynamics Reviewed

Seihou Jinnai, Kasumi Murayama, Keisuke Nagai, Megumi Mineshita, Kosaku Kato, Azusa Muraoka, Akira Yamakata, Akinori Saeki, Yasuhiro Kobori, Yutaka Ie

Journal of Materials Chemistry A 10 ( 37 ) 20035 - 20047 2022

Photoexcited charge manipulation in conjugated polymers bearing a Ru(ii) complex catalyst for visible-light CO2 reduction Invited Reviewed

Akinobu Nakada, Ryuichi Miyakawa, Ren Itagaki, Kosaku Kato, Chinami Takashima, Akinori Saeki, Akira Yamakata, Ryu Abe, Hiromi Nakai, Ho-Chol Chang

Journal of Materials Chemistry A 10 ( 37 ) 19821 - 19828 2022

Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry ({RSC})

Conjugated polymers have emerged as promising candidates for photocatalyst materials. Design principles that maximize the synergy between the conjugated skeleton and catalyst moiety are strongly desired to be established for achieving efficient photocatalysis. Herein, the photoexcited charge manipulation was demonstrated by molecular engineering in conjugated polymers bearing a Ru(II) complex as the CO2 reduction photocatalyst. Combinational studies based on ultrafast spectroscopies and theoretical calculations revealed that the introduction of an electron-donating carbazole (Cz) skeleton in the polymer enables enhanced photoexcited charge trapping on the Ru(II)-complex catalyst moiety. The carbazole-based polymer [Cz-bpyRu](n) facilitates CO2 reduction under visible light even longer than 500 nm and exhibited 7- to 15-fold greater activity than those of phenyl (Ph) and benzothiadiazole (Bt) counterparts. The findings of this study thus provide insights into molecular engineering for photoexcited charge manipulation to achieve efficient photocatalysis.

DOI： 10.1039/D2TA02183H

Unfolding the Role of B Site-Selective Doping of Aliovalent Cations on Enhancing Sacrificial Visible Light-Induced Photocatalytic H₂ and O₂ Evolution over BaTaO₂N

Akira Yamakata

ACS Catalysis 2022

One-Step Excitation Overall Water Splitting over a Modified Mg-Doped BaTaO2N Photocatalyst

Akira Yamakata

ACS Catalysis 2022

Harnessing infrared solar energy with plasmonic energy upconversion

Akira Yamakata

Nature Sustainability 2022

Effect of Terminal-Group Halogenation of Naphthalene-Based Nonfullerene Acceptors on Their Film Structure and Photophysical and Photovoltaic Properties Reviewed

Tomokazu Umeyama, Tatsuho Wada, Kensho Igarashi, Kosaku Kato, Akira Yamakata, Taiki Takeyama, Yuji Sakamoto, Yasunari Tamai, Hideo Ohkita, Keiichi Ishida, Tomoyuki Koganezawa, Shunsuke Ohtani, Kazuo Tanaka, Hiroshi Imahori

ACS Applied Energy Materials 4 ( 12 ) 14022 - 14033 2021.12

Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

Terminal-group halogenation is an effective strategy for tuning energy levels, improving light-harvesting ability, and enhancing the intermolecular stacking of nonfullerene acceptors (NFAs) for organic photovoltaic (OPV) devices. Understanding the influence of different halogen atoms on their film structure and photophysical and photovoltaic properties is crucial for designing NFAs. To address this issue, three acceptor-donor-acceptor (A-D-A)-type NFAs, named NTTIC-F, NTTIC-Cl, and NTTIC, were designed. All three NFAs consisted of a naphthalene-containing fused-ring as a D core unit and dihalogenated or nonhalogenated 1,1-dicyanomethylene-3-indanone groups as terminal A units. NTTIC-Cl exhibited broadened absorption and downshifted energy levels compared to NTTIC-F and NTTIC. Meanwhile, the singlet exciton lifetimes in solution increased in the order of NTTIC < NTTIC-F < NTTIC-Cl, but these were shortened in the pristine films and rather comparable. From grazing-incidence wide-angle X-ray scattering measurements, the tendency of NTTIC-F < NTTIC < NTTIC-Cl was found for the formation of the face-on-oriented packing structures. To the best of our knowledge, this is the first observation of a change in the molecular orientation of NFAs by the type of the halogenation atom at the terminal A unit. When blended with J71 as a conjugated polymer donor, the NTTIC-Cl-based OPV device showed a higher short-circuit current density (JSC, 20.5 mA cm-2) than the NTTIC-F- and NTTIC-based devices (19.6 and 15.6 mA cm-2, respectively). Overall, the power conversion efficiencies of the NTTIC-F- and NTTIC-Cl-based devices were similar (10.6 and 10.5%, respectively) but higher than that of the NTTIC-based device. The former resulted from the higher open-circuit voltage (VOC, 0.812 V) and fill factor (0.666) of the NTTIC-F-based device than those of the NTTIC-Cl-based device (0.793 V and 0.646, respectively).

DOI： 10.1021/acsaem.1c02816

Modified SILAR grown ZnO films on p ‐Si(100) with enhanced charge separation for UV light sensing application Reviewed

Jose Presiphil B. Ontolan, Junie Jhon M. Vequizo, Akira Yamakata, Reynaldo M. Vequizo

physica status solidi (a) 218 ( 22 ) 2100363 - 2100363 2021.10

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Herein, the growth of pristine ZnO nanostructures thin film on p-Si(100) by modified successive ionic layer adsorption-reduction method, revealing significant improvement in the charge collection for ultraviolet light detection, is reported. The deposited ZnO exhibits spindle-like and hexagonal structure that grows preferentially along the c-axis. Two-probe electrical measurements validate the rectifying nature of the constructed n-ZnO/p-Si(100), revealing a substantial 11.3-fold increase in photocurrent at room temperature under 375 nm irradiation at +3 V working voltage. The drastic increase in photocurrent is linked to efficient charge separation caused by charge transfer and band bending effects, as indicated by microsecond time-resolved absorption measurements, providing useful information for device development.

DOI： 10.1002/pssa.202100363

Forward and backward electron transfer on Pt loaded TiO2 photocatalysts under visible-light illumination Reviewed

Naohiro Inoue, Kyohei Shiraki, Kosaku Kato, Shu Ashimura, Masaaki Yoshida, Akira Yamakata

Applied Physics Letters 119 ( 13 ) 133905 - 133905 2021.9

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：AIP Publishing

The surface plasmon resonance (SPR) effects of metal nanoparticles prove versatile in terms of equipping wideband-gap photocatalysts, such as TiO2, with visible-light responsiveness. In this regard, Au is the most frequently used material for its SPR, but alternative materials are also being actively developed to effectively utilize solar light from the visible to the near-infrared region. In this work, we found that Pt particles loaded on TiO2 were also active in effecting SPR-induced photocatalysis. Time-resolved absorption measurements confirmed that visible-light irradiation induces electron transfer from Pt to TiO2, and the efficiency of this electron injection increases as the wavelength of the incident light decreases from 660 to 450 nm. Observations of the peak shift of the vibrational frequency of adsorbed CO on Pt confirmed that the Fermi level of Pt decreases as the electron transfer from Pt to TiO2 proceeds. These results imply that Pt nanoparticles can act as sensitizers to induce electron transfer from Pt to TiO2, although Pt is a well-known cocatalyst that enhances H-2 evolution by collecting electrons from TiO2. However, as the intensity of the irradiated light increased beyond 50 mW cm(-2), a portion of the Pt particles started to capture the injected electrons from TiO2, suggesting that the electron transfer from one Pt particle to the other Pt particles via the conduction band of TiO2 proceeds under visible light illumination. These opposing roles may be ascribed to the variation in the size of Pt particles as well as density of electrons injected into TiO2.

DOI： 10.1063/5.0065074

Time-Retrenched Synthesis of BaTaO2N by Localizing an NH3 Delivery System for Visible-Light-Driven Photoelectrochemical Water Oxidation at Neutral pH: Solid-State Reaction or Flux Method? Reviewed

Mirabbos Hojamberdiev, J. Manuel Mora-Hernandez, Ronald Vargas, Akira Yamakata, Kunio Yubuta, Eva Maria Heppke, Leticia M. Torres-Martínez, Katsuya Teshima, Martin Lerch

ACS Applied Energy Materials 4 ( 9 ) 9315 - 9327 2021.9

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

Among 600 nm class transition-metal oxynitrides, BaTaO2N with a cubic Pm (3) over barm perovskite-type structure is promising for solar water oxidation due to its absorption of visible light up to 660 nm, narrower band gap (E-g = 1.9 eV), appropriate valence band edge position for oxygen evolution, good stability in concentrated alkaline solutions, and nontoxicity. However, high defect density stemmed from long high-temperature ammonolysis limits the separation and transfer efficiency of photogenerated charge carriers in BaTaO2N. Here, a NH3 delivery system is specifically localized just above the synthesis mixture to reduce the synthesis time and defect density of BaTaO2N by a fresh supply of more active nitriding species and minimizing the generation of N-2 and H-2. Particularly, the effects of synthesis temperature (700-950 degrees C), synthesis time (1-8 h), and gas composition are systematically investigated to gain insights into the formation of single-phase BaTaO2N by solid-state reaction and flux method. Time-dependent experiments conducted at 950 degrees C show that single-phase BaTaO2N can be synthesized >= 6 and >= 4 h by solid-state reaction and flux method, respectively, revealing the advantage of the flux method over solid-state reaction in a localized NH3 delivery system. Subsequently, the separation and transfer efficiency and kinetics of photogenerated charge carriers are studied in BaTaO2N samples. Photoelectrochemical studies made it possible to resolve trends during visible-light-induced water oxidation, evidencing the inverse relationship between recombination and charge transfer phenomena. Transient absorption spectroscopy reveals that the dynamics of the photogenerated charge carriers in both types of BaTaO2N samples are different: (i) BaTaO2N synthesized by flux method has a greater number of holes despite the similar number of deeply trapped charge carriers and (ii) solid-state reaction led to the formation of a higher number of free electrons in BaTaO2N. The findings demonstrate the advantage of reducing the transfer distance of active nitriding species to the surface of the synthesis mixture for enhancing the photoelectrochemical water oxidation of BaTaO2N at neutral pH.

DOI： 10.1021/acsaem.1c01539

Control of the Photocatalytic Activity of Metastable Layered Oxynitride K2LaTa2O6N through Topochemical Transformation of Tuned Oxide Precursors Reviewed

Hiroto Mogi, Kosaku Kato, Shuhei Yasuda, Tomoki Kanazawa, Akinobu Miyoshi, Shunta Nishioka, Takayoshi Oshima, Ya Tang, Toshiyuki Yokoi, Shunsuke Nozawa, Akira Yamakata, Kazuhiko Maeda

Chemistry of Materials 33 ( 16 ) 6443 - 6452 2021.8

Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

In the development of oxynitride photocatalysts, thermal ammonolysis of a metal oxide precursor has often been conducted by varying the reaction conditions (e.g., temperatures, reaction times, and ammonia gas flow rates) to obtain high-quality oxynitride particles that efficiently function as photocatalysts. However, this approach may suffer from undesirable changes in the physicochemical properties of the resulting oxynitride, leading to the lowering of the photocatalytic activity. Here, we show that it is possible to control the photocatalytic activity of Ruddlesden-Popper metastable layered oxynitride K2LaTa2O6N, obtained from the Dion-Jacobson phase KLaTa2O7 through a topochemical ammonolysis reaction, by controlling the quality of the KLaTa2O7 template. During the ammonolysis of KLaTa2O7, in the presence of K2CO3, to K2LaTa2O6N, the structural properties (e.g., degree of crystallinity and particle size) of the oxide precursor were replicated in the resulting oxynitride. Namely, the use of KLaTa2O7, possessing a higher degree of crystallinity, led to larger K2LaTa2O6N particles being formed. By increasing the crystallinity of KLaTa2O7, the photocatalytic activity of the resulting K2LaTa2O6N for H2 evolution was improved for reaction in aqueous NaI solution under visible light irradiation. This improvement in performance was due to the longer lifetime of the photogenerated mobile electrons in high-crystallinity K2LaTa2O6N compared with that in the low-crystallinity analogue, as confirmed by femtosecond transient absorption spectroscopy. However, the photocatalytic activity of K2LaTa2O6N derived from well-grown larger KLaTa2O7 particles was an order of magnitude lower than that of the best-performing material. Physicochemical measurements revealed that the large K2LaTa2O6N particles contained a relatively high density of anionic defects on the surface, which shortened the lifetime of the photogenerated charge carriers, leading to lower photocatalytic activity.

DOI： 10.1021/acs.chemmater.1c01726

Surface Modifications of (ZnSe)0.5(CuGa2.5Se4.25)0.5 to Promote Photocatalytic Z-Scheme Overall Water Splitting Reviewed

Shanshan Chen, Junie Jhon M. Vequizo, Zhenhua Pan, Takashi Hisatomi, Mamiko Nakabayashi, Lihua Lin, Zheng Wang, Kosaku Kato, Akira Yamakata, Naoya Shibata, Tsuyoshi Takata, Taro Yamada, Kazunari Domen

Journal of the American Chemical Society 143 ( 28 ) 10633 - 10641 2021.7

Simultaneously Tuning the Defects and Surface Properties of Ta3N5 Nanoparticles by Mg–Zr Codoping for Significantly Accelerated Photocatalytic H2 Evolution Reviewed

Jiadong Xiao, Junie Jhon M. Vequizo, Takashi Hisatomi, Jabor Rabeah, Mamiko Nakabayashi, Zheng Wang, Qi Xiao, Huihui Li, Zhenhua Pan, Mary Krause, Nick Yin, Gordon Smith, Naoya Shibata, Angelika Brückner, Akira Yamakata, Tsuyoshi Takata, Kazunari Domen

Journal of the American Chemical Society 143 ( 27 ) 10059 - 10064 2021.7

Buckyball as an Electron Donor in a Dyad of C60 and Xanthene Dye Reviewed

Haruka Kano, Kyohei Matsuo, Hironobu Hayashi, Kosaku Kato, Akira Yamakata, Hiroko Yamada, Naoki Aratani

European Journal of Organic Chemistry 2021 ( 23 ) 3377 - 3381 2021.6

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

We successfully achieved the synthesis of C-60-xanthlium, X60_NTf2, where fullerene is an electron donor and xanthlium is an electron acceptor. When the precursor compound X60-OH was excited at 550 nm, the C-60 emission was observed at 715 nm. On the other hand, the fluorescence of X60_NTf2 was completely quenched under the same conditions, suggesting that photo-induced intramolecular electron transfer (ET) occurred from the singlet excited state of C-60. The electrochemical measurement proved that the X60_NTf2 is exothermically possible of ET reaction from C-1(60)* to xanthylium to form C-60(.+). Density functional theory (DFT) calculations support the acceptor ability of the xanthylium by showing that the coefficients of the lowest unoccupied molecular orbital (LUMO) were on xanthene moiety. This is a well-arranged model compound to investigate the properties of transiently generated fullerene radical cations.

DOI： 10.1002/ejoc.202100276

Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ejoc.202100276

Titanium Dioxide/Polyvinyl Alcohol/Cork Nanocomposite: A Floating Photocatalyst for the Degradation of Methylene Blue under Irradiation of a Visible Light Source Reviewed

Nurul Hidayah Mohamad Idris, Jayalakshmi Rajakumar, Kuan Yew Cheong, Brendan J. Kennedy, Teruhisa Ohno, Akira Yamakata, Hooi Ling Lee

ACS Omega 6 ( 22 ) 14493 - 14503 2021.6

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society ({ACS})

Photocatalytic degradation by the titanium dioxide (TiO2) photocatalyst attracts tremendous interest due to its promising strategy to eliminate pollutants from wastewater. The floating photocatalysts are explored as potential candidates for practical wastewater treatment applications that could overcome the drawbacks posed by the suspended TiO2 photocatalysis system. The problem occurs when the powdered TiO2 applied directly into the treated solution will form a slurry, making its reuse become a difficult step after treatment. In this study, the immobilization of titanium dioxide nanoparticles (TiO2 NPs) on the floating substrate (cork) employing polyvinyl alcohol (PVA) as a binder to anchor TiO2 NPs on the surface of the cork was carried out. Characterizations such as Fourier transformer infrared, X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-vis), zeta potential, photoluminescence spectroscopy, femtosecond to millisecond time-resolved visible to mid-IR absorption spectroscopy, ion chromatography, and scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDX) analyses were employed. XRD analysis revealed the formation of anatase-phase TiO2 NPs. The results demonstrated that the crystallite size was 9.36 nm. The band gap energy of TiO2 NPs was determined as 3.0 eV. PL analysis verified that TiO2 NPs possessed a slower recombination rate of electron-hole pairs as compared to anatase TiO2. The result was attributed by the behavior of photogenerated charge carriers on TiO2 NPs, which existed as shallowly trapped electrons that could survive longer than a few milliseconds in this study. Furthermore, SEM-EDX analysis indicated that TiO2 NPs were well distributed on the surface of the cork. At the optimal mole ratio of TiO2/PVA (1:8), the TiO2/PVA/cork floating photocatalyst degraded at 98.43% of methylene blue (MB) under a visible light source which performed better than under sunlight irradiation (77.09% of MB removal) for 120 min. Besides, the mineralization result has measured the presence of sulfate anions after photocatalytic activities, which achieved 86.13% (under a visible light source) and 65.34% (under sunlight). The superior photodegradation performance for MB was mainly controlled by the reactive oxygen species of the superoxide radical (O-center dot(2)-). The degradation kinetics of MB followed the first-order kinetics. Meanwhile, the Langmuir isotherm model was fitted for the adsorption isotherm. The floating photocatalyst presented good reusability, resulting in 78.13% of MB removal efficiency even after five cycles. Our TiO2/PVA/cork floating photocatalyst fabrication and high photocatalytic performance are potentially used in wastewater treatment, especially under visible light irradiation.

DOI： 10.1021/acsomega.1c01458

(Invited) Core-Shell Double Doping for the Remarkable Photocatalytic Water Splitting on Ga2O3

Akira Yamakata, Junie Jhon M. Vequizo, Kosaku Kato, Yoshihisa Sakata

ECS Meeting Abstracts {MA}2021-01 ( 15 ) 725 - 725 2021.5

Atomically dispersed antimony on carbon nitride for the artificial photosynthesis of hydrogen peroxide Reviewed

Zhenyuan Teng, Qitao Zhang, Hongbin Yang, Kosaku Kato, Wenjuan Yang, Ying-Rui Lu, Sixiao Liu, Chengyin Wang, Akira Yamakata, Chenliang Su, Bin Liu, Teruhisa Ohno

Nature Catalysis 4 ( 5 ) 374 - 384 2021.5

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Artificial photosynthesis offers a promising strategy to produce hydrogen peroxide (H2O2)-an environmentally friendly oxidant and a clean fuel. However, the low activity and selectivity of the two-electron oxygen reduction reaction (ORR) in the photocatalytic process greatly restricts the H2O2 production efficiency. Here we show a robust antimony single-atom photocatalyst (Sb-SAPC, single Sb atoms dispersed on carbon nitride) for the synthesis of H2O2 in a simple water and oxygen mixture under visible light irradiation. An apparent quantum yield of 17.6% at 420 nm together with a solar-to-chemical conversion efficiency of 0.61% for H2O2 synthesis was achieved. On the basis of time-dependent density function theory calculations, isotopic experiments and advanced spectroscopic characterizations, the photocatalytic performance is ascribed to the notably promoted two-electron ORR by forming mu-peroxide at the Sb sites and highly concentrated holes at the neighbouring N atoms. The in situ generated O-2 via water oxidation is rapidly consumed by ORR, leading to boosted overall reaction kinetics.Hydrogen peroxide is an interesting target for artificial photosynthesis, although its actual production via the two-electron oxygen reduction reaction remains limited. Now, a carbon nitride-supported antimony single atom photocatalyst has been developed with a superior performance for this process.

DOI： 10.1038/s41929-021-00605-1

Other Link： http://www.nature.com/articles/s41929-021-00605-1

A Na-containing Pt cocatalyst for efficient visible-light-induced hydrogen evolution on BaTaO2N Reviewed

Huihui Li, Daling Lu, Shanshan Chen, Takashi Hisatomi, Junie Jhon M. Vequizo, Jiadong Xiao, Zheng Wang, Lihua Lin, Qi Xiao, Yuliang Sun, Yugo Miseki, Kazuhiro Sayama, Akira Yamakata, Tsuyoshi Takata, Kazunari Domen

Journal of Materials Chemistry A 9 ( 24 ) 13851 - 13854 2021.4

Utilization of Perovskite-Type Oxynitride La0.5Sr0.5Ta0.5Ti0.5O2N as an O2-Evolving Photocatalyst in Z-Scheme Water Splitting Reviewed

Hiromu Kumagai, Ryosuke Aoyagi, Kosaku Kato, Akira Yamakata, Masato Kakihana, Hideki Kato

ACS Applied Energy Materials 2021.3

Core–Shell Double Doping of Zn and Ca on β-Ga2O3 Photocatalysts for Remarkable Water Splitting Reviewed

Akira Yamakata, Junie Jhon M. Vequizo, Takafumi Ogawa, Kosaku Kato, Shoya Tsuboi, Naohiro Furutani, Masahiro Ohtsuka, Shunsuke Muto, Akihide Kuwabara, Yoshihisa Sakata

ACS Catalysis 11 ( 4 ) 1911 - 1919 2021.2

Sequential cocatalyst decoration on BaTaO2N towards highly-active Z-scheme water splitting Reviewed

Zheng Wang, Ying Luo, Takashi Hisatomi, Junie Jhon M. Vequizo, Sayaka Suzuki, Shanshan Chen, Mamiko Nakabayashi, Lihua Lin, Zhenhua Pan, Nobuko Kariya, Akira Yamakata, Naoya Shibata, Tsuyoshi Takata, Katsuya Teshima, Kazunari Domen

Nature Communications 12 ( 1 ) 1005 2021.2

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

<title>Abstract</title>Oxynitride photocatalysts hold promise for renewable solar hydrogen production via water splitting owing to their intense visible light absorption. Cocatalyst loading is essential for activation of such oxynitride photocatalysts. However, cocatalyst nanoparticles form aggregates and exhibit weak interaction with photocatalysts, which prevents eliciting their intrinsic photocatalytic performance. Here, we demonstrate efficient utilization of photoexcited electrons in a single-crystalline particulate BaTaO₂N photocatalyst prepared with the assistance of RbCl flux for H₂ evolution reactions via sequential decoration of Pt cocatalyst by impregnation-reduction followed by site-selective photodeposition. The Pt-loaded BaTaO₂N photocatalyst evolves H₂ over 100 times more efficiently than before, with an apparent quantum yield of 6.8% at the wavelength of 420 nm, from a methanol aqueous solution, and a solar-to-hydrogen energy conversion efficiency of 0.24% in Z-scheme water splitting. Enabling uniform dispersion and intimate contact of cocatalyst nanoparticles on single-crystalline narrow-bandgap particulate photocatalysts is a key to efficient solar-to-chemical energy conversion.

DOI： 10.1038/s41467-021-21284-3

Other Link： http://www.nature.com/articles/s41467-021-21284-3

半導体光触媒粒子中の欠陥が及ぼす光励起キャリアの再結合促進と抑制効果 Invited

山方啓, 加藤康作

会報光触媒 64 27 - 36 2021.1

Earth-abundant iron(iii) species serves as a cocatalyst boosting the multielectron reduction of IO3−/I− redox shuttle in Z-scheme photocatalytic water splitting Reviewed

Katsuya Murofushi, Kanta Ogawa, Hajime Suzuki, Ryota Sakamoto, Osamu Tomita, Kosaku Kato, Akira Yamakata, Akinori Saeki, Ryu Abe

Journal of Materials Chemistry A 9 ( 19 ) 11718 - 11725 2021

Cocatalyst engineering of a narrow bandgap Ga-La5Ti2Cu0.9Ag0.1O7S5 photocatalyst towards effectively enhanced water splitting Reviewed

Qi Xiao, Jiadong Xiao, Junie Jhon M. Vequizo, Takashi Hisatomi, Mamiko Nakabayashi, Shanshan Chen, Zhenhua Pan, Lihua Lin, Naoya Shibata, Akira Yamakata, Tsuyoshi Takata, Kazunari Domen

Journal of Materials Chemistry A 9 ( 48 ) 27485 - 27492 2021

Atomically dispersed antimony on carbon nitride for the artificial photosynthesis of hydrogen peroxide (vol 4, pg 374, 2021)

Akira Yamakata

Nature Catalysis 2021

Heavy Metal Effects on the Photovoltaic Properties of Metallocorroles in Dye-Sensitized Solar Cells Reviewed

Tomohiro Higashino, Yuma Kurumisawa, Abraham B. Alemayehu, Rune F. Einrem, Debashis Sahu, Daniel Packwood, Kosaku Kato, Akira Yamakata, Abhik Ghosh, Hiroshi Imahori

ACS Applied Energy Materials 3 ( 12 ) 12460 - 12467 2020.12

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society ({ACS})

Finding strategies for effective charge separation is a prerequisite for realizing efficient solar energy conversion in photovoltaic and photocatalytic devices. Porphyrinoids, including porphyrins and related macrocycles such as phthalocyanines and corroles, are versatile ligands that can accommodate a single metal atom for most metal ions, and their photophysical and electro-chemical properties can be tuned by the metal atom in the cavity. Herein, we evaluated the photovoltaic properties of the dyesensitized solar cells (DSSCs) based on Au-III-, (ReO)-O-V-, and (OsN)-N-VI-corroles with COOH anchoring groups at the para- and meta-positions of the meso-phenyl groups. The DSSCs based on Au-III-corroles exhibited a power conversion efficiency (PCE) of 4.2%, which is remarkably higher than those for the (ReO)-O-V- and (OsN)-N-VI-corroles. Femtosecond time-resolved transient absorption measurements have shown that the electron injection from the excited singlet state competes with intersystem crossing, and that intersystem crossing for Au-III-corroles is slower than those for ReVO- and (OsN)-N-VI-corroles. Consequently, the high incident photon-to-current efficiencies and resultant short-circuit current densities and PCEs for Au-III-corroles are attributed to the high electron injection efficiencies owing to the slower intersystem crossing than ReVO- and (OsN)-N-VI-corroles. In addition, the higher PCE for a Au-III-corrole with a meta-COOH group (4.2%) as opposed to a para-COOH group (3.4%) is explained by the stronger Au-TiO2 interactions supported by XPS measurements and theoretical calculations. These results imply that both the substituents and the metal ion have a large influence on the photovoltaic performances. Overall, DSSCs based on the Au-III-corroles were found to exhibit the highest photovoltaic performance among corrole-based DSSCs.

DOI： 10.1021/acsaem.0c02427

Time-Resolved Spectroscopy of Defect-Induced Effects on Photocarrier Dynamics in SrTiO3 Powder

Akira Yamakata, Kosaku Kato

ECS Meeting Abstracts {MA}2020-02 ( 56 ) 3873 - 3873 2020.11

Optically Transparent Colloidal Dispersion of Titania Nanoparticles Storable for Longer than One Year Prepared by Sol/Gel Progressive Hydrolysis/Condensation Reviewed

Keito Sano, Fazalurahman Kuttassery, Tetsuya Shimada, Tamao Ishida, Shinsuke Takagi, Bunsho Ohtani, Akira Yamakata, Tetsuo Honma, Hiroshi Tachibana, Haruo Inoue

ACS Applied Materials & Interfaces 12 ( 40 ) 44743 - 44753 2020.10

Publishing type：Research paper (scientific journal) Publisher：American Chemical Society ({ACS})

Copyright © 2020 American Chemical Society. The molecular catalyst sensitized system (MCSS), where an excited molecular catalyst adsorbed on a semiconductor such as TiO2 injects electrons to the conduction band of the semiconductor leading to hydrogen evolution/CO2 reduction coupled with an oxidation of water on the molecular catalyst, has been one of the most probable candidates in the approach to artificial photosynthesis. For a full utilization of visible light, however, a serious light scattering of the aqueous suspension of TiO2 in the visible region, which is generally experienced, should be avoided. Here, we report a preparation of optically transparent colloidal dispersion of TiO2 by the sol/gel reaction of TiCl4 through progressive hydrolysis/condensation under the basic condition without any calcination processes. The TiO2 nanoparticles (TiO2(NPs)) obtained were characterized as an amorphous particle (∼10-15 nm) having a microcrystal domain of anatase within several nm by XRD, Raman spectroscopies, XRF, XAFS, TG/DTA, and HRTEM, respectively. The energy-resolved distribution of carrier electron traps in TiO2(NPs) as a fingerprint of TiO2 was characterized through reversed double-beam photo-acoustic spectroscopy to have a close similarity to that of TiO2(ST-01) as well as the observation of carrier traps by transient absorption spectroscopy. Though the powder TiO2(NP) itself was not dispersed well in aqueous solution, the wet TiO2(NPs) as prepared before being dried up provided a completely transparent aqueous dispersion under the acidic condition (1 M HCl). Addition of methanol enabled the colloidal dispersion (TiO2(NPs, MeOH/H2O, 0.1 M HCl)) to keep the optical transparency for longer than 1 year (550 days), which is the first example of TiO2 dispersion storable for such a long period. TiO2(NPs, MeOH/H2O) exhibited a moderate photocatalytic reactivity of H2 evolution with a quantum yield of ∼2.6% upon 365 nm light irradiation. An optically transparent thin film of TiO2(NPs, MeOH/H2O) was also successfully prepared on a glass plate to exhibit an enhanced hydrophilicity upon UV light irradiation.

DOI： 10.1021/acsami.0c12951

Investigation on the highly active SrTiO3 photocatalyst toward overall H2O splitting by doping Na ion Reviewed

Junzhe Jiang, Kosaku Kato, Hirotaka Fujimori, Akira Yamakata, Yoshihisa Sakata

Journal of Catalysis 390 81 - 89 2020.8

Synthesis of Three-Layer Perovskite Oxynitride K2Ca2Ta3O9N·2H2O and Photocatalytic Activity for H2 Evolution under Visible Light Reviewed

Ya Tang, Kosaku Kato, Takayoshi Oshima, Hiroto Mogi, Akinobu Miyoshi, Kotaro Fujii, Kei-ichi Yanagisawa, Koji Kimoto, Akira Yamakata, Masatomo Yashima, Kazuhiko Maeda

Inorganic Chemistry 59 ( 15 ) 11122 - 11128 2020.8

Heteroatom Dopants Promote Two‐Electron O 2 Reduction for Photocatalytic Production of H 2 O 2 on Polymeric Carbon Nitride Reviewed

Peng Zhang, Yawen Tong, Yong Liu, Junie Jhon M. Vequizo, Hongwei Sun, Can Yang, Akira Yamakata, Fengtao Fan, Wei Lin, Xinchen Wang, Wonyong Choi

Angewandte Chemie International Edition 59 16209 - 16217 2020.6

Activation of a Pt-loaded Pb<inf>2</inf>Ti<inf>2</inf>O<inf>5.4</inf>F<inf>1.2</inf> photocatalyst by alkaline chloride treatment for improved H<inf>2</inf> evolution under visible light Reviewed

Wakayama, H., Kato, K., Kashihara, K., Uchiyama, T., Miyoshi, A., Nakata, H., Lu, D., Oka, K., Yamakata, A., Uchimoto, Y., Maeda, K.

Journal of Materials Chemistry A 8 ( 18 ) 9099 - 9108 2020.4

Efficient photocatalytic hydrogen evolution on single-crystalline metal selenide particles with suitable cocatalysts Reviewed

Shanshan Chen, Junie Jhon, M. Vequizo, Takashi Hisatomi, Mamiko Nakabayashi, Lihua Lin, Zheng Wang, Akira Yamakata, Naoya Shibata, Tsuyoshi Takata, Taro Yamada, Kazunari Domen

Chemical Science 11 ( 25 ) 6436 - 6441 2020.4

How g-C3N4 Works and Is Different from TiO2 as an Environmental Photocatalyst: Mechanistic View

Jonghun Lim, Hyejin Kim, Jihee Park, Gun-Hee Moon, Junie Jhon M Vequizo, Akira Yamakata, Jinwoo Lee, Wonyong Choi

Environmental science & technology 54 ( 1 ) 497 - 506 2020.1

Language：English Publishing type：Research paper (scientific journal) Publisher：NLM (Medline)

Graphitic carbon nitride (CN) as a popular visible light photocatalyst needs to be better understood for environmental applications. The behaviors of CN as an environmental photocatalyst were systematically studied in comparison with a well-known TiO2 photocatalyst. The two photocatalysts exhibit different photocatalytic oxidation (PCO) behaviors and dependences on the experimental conditions (e.g., pH, Pt loading, and the kind of organic substrate and scavenger). The PCO of organic substrates was significantly enhanced by loading Pt on TiO2 under UV light (λ &gt
320 nm), whereas Pt-CN exhibited a lower PCO activity than bare CN under visible light (λ &gt
420 nm). While the presence of Pt enhances the charge separation in both TiO2/UV and CN/visible light systems (confirmed by transient IR absorption spectroscopic analysis), the opposite effects of Pt are ascribed to the different mechanisms of •OH generation in the two photocatalytic systems. The negative effect of Pt on CN is ascribed to the fact that Pt catalytically decomposes in situ-generated H2O2 (a main precursor of OH radical), which hinders •OH production. The production of OH radicals on CN is favored only at acidic pH but 1O2 generation is dominant in alkaline pH. The pH-dependent behaviors of reactive oxygen species generation on CN were confirmed by electron paramagnetic resonance spin trap measurements.

DOI： 10.1021/acs.est.9b05044

Identification of Individual Electron- and Hole-Transfer Kinetics at CoOx/BiVO4/SnO2 Double Heterojunctions Reviewed

Akira Yamakata, Chandana Sampath, Kumara Ranasinghe, Naruki Hayashi, Kosaku Kato, Junie Jhon, M. Vequizo

ACS Applied Energy Materials 3 ( 1 ) 1207 - 1214 2020.1

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The fabrication of heterojunctions with different band gap semiconductors is a promising approach to increase photoelectrochemical (PEC) activity. The PEC activity is determined by the charge separation; hence, the behaviors of charge carriers at the junctions should be elucidated. However, it has been quite challenging since the distinction of carriers located in different layers has been extremely hard. In this work, we succeeded in the identification of the individual electron- and hole-transfer kinetics at CoOx/BiVO4/SnO2 double heterojunctions by measuring transient absorption (TA) from the visible to mid-IR region: we found that the absorption peaks of electrons and holes depend on the materials. From the change in spectral shape after the selective photoexcitation of BiVO4, it was confirmed that electrons excited in the BiVO4 rapidly transferred to the SnO2 layer after similar to 3 ps, but the holes remained in the BiVO4 and further transferred to CoOx in a few picoseconds. As a result, recombination of charge carriers was suppressed and 2.4 and 3.6 times a large amount of carriers are surviving at 5 mu s on BiVO4/SnO2 and CoOx/BiVO4/SnO2, respectively, compared to bare BiVO4. For such picosecond-rapid and effective charge separation, the previously well proposed sole intralayer or interlayer charge separation mechanism is not enough. Hence the synergetic effect of these two mechanisms, the band-bending-assisted charge transfer across the heterojunction, is proposed. The enhanced PEC activity of CoOx/BiVO4/SnO2 electrodes was reasonably explained by this synergistic charge separation kinetics. This fundamental knowledge of charge carrier dynamics will be beneficial for the design of superior solar energy conversion systems.

DOI： 10.1021/acsaem.9b02262

時間分解分光測定による粉末欠陥への光励起キャリアー捕捉過程と光触媒活性に及ぼす影響 Reviewed

山方啓* and Junie Jhon M. Vequizo,

触媒【特集号: 触媒設計を拓く欠陥構造のキャラクタリゼーション】 62 ( 1 ) 22 - 28 2020.1

Synthesis of Copolymerized Carbon Nitride Nanosheets from Urea and 2-Aminobenzonitrile for Enhanced Visible-Light CO2 Reduction with a Ruthenium(II) Complex Catalyst Reviewed

Kengo Shibata, Kosaku Kato, Constantine Tsounis, Tomoki Kanazawa, Daling Lu, Shunsuke Nozawa, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda

Solar RRL 4 ( 8 ) 1900461 2020.1

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-V C H VERLAG GMBH

Copolymerized carbon nitride nanosheets (NS-C3N4) are synthesized by heating a mixture of urea and 2-aminobenzonitrile (ABN) at 823 K for 2 h in air. The visible light-absorption capability of the copolymerized NS-C3N4 can be improved with an increase in the ABN content in the starting material, while maintaining the rather negative conduction band potential of NS-C3N4. With the aid of a ruthenium(II) complex catalyst, the copolymerized NS-C3N4 becomes active for CO2 reduction into formate (>90% selectivity) under visible light (lambda > 400 nm) in the presence of triethanolamine as an electron donor. The activity is enhanced with increasing the starting ABN content to reach a maximum at a certain amount, beyond which it declines. The optimized material, modified with a silver promoter and a phosphonate-functionalized ruthenium(II) catalyst, gives a high turnover number of 6000 (vs Ru catalyst) for formate production. Physicochemical analyses indicate that increasing the starting ABN concentration improves the visible light-absorption capability of the copolymerized NS-C3N4, but increases the number of trap states, which can work as recombination centers of photogenerated electrons and holes. Therefore, an appropriate adjustment of the ABN comonomer amount is essential to obtain copolymerized NS-C3N4, which shows high photocatalytic activity.

DOI： 10.1002/solr.201900461

How g-C3N4 Works and Is Different from TiO2 as Environmental Photocatalyst: Mechanistic View Reviewed International journal

Jonghun Lim, Hyejin Kim, Jihee Park, Gun-hee Moon, Junie Jhon, M. Vequizo, Akira Yamakata, Jinwoo Lee, Wonyong Choi

Environmental Science & Technology 54 ( 1 ) 497 - 506 2020.1

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Graphitic carbon nitride (CN) as a popular visible light photocatalyst needs to be better understood for environmental applications. The behaviors of CN as an environmental photocatalyst were systematically studied in comparison with a well-known TiO2 photocatalyst. The two photocatalysts exhibit different photocatalytic oxidation (PCO) behaviors and dependences on the experimental conditions (e.g., pH, Pt loading, and the kind of organic substrate and scavenger). The PCO of organic substrates was significantly enhanced by loading Pt on TiO2 under UV light (lambda > 320 nm), whereas Pt-CN exhibited a lower PCO activity than bare CN under visible light (lambda > 420 nm). While the presence of Pt enhances the charge separation in both TiO2/UV and CN/visible light systems (confirmed by transient IR absorption spectroscopic analysis), the opposite effects of Pt are ascribed to the different mechanisms of center dot OH generation in the two photocatalytic systems. The negative effect of Pt on CN is ascribed to the fact that Pt catalytically decomposes in situ-generated H2O2 (a main precursor of OH radical), which hinders center dot OH production. The production of OH radicals on CN is favored only at acidic pH but O-1(2) generation is dominant in alkaline pH. The pH-dependent behaviors of reactive oxygen species generation on CN were confirmed by electron paramagnetic resonance spin trap measurements.

DOI： 10.1021/acs.est.9b05044

Cobalt Aluminate Spinel as a Cocatalyst for Photocatalytic Oxidation of Water: Significant Hole-Trapping Effect Reviewed

Kanazawa, T., Kato, K., Yamaguchi, R., Uchiyama, T., Lu, D., Nozawa, S., Yamakata, A., Uchimoto, Y., Maeda, K.

ACS Catalysis 10 ( 9 ) 4960 - 4966 2020

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society ({ACS})

Here we show that nanoparticulate CoAl2O4 spinel serves as an efficient cocatalyst for photocatalytic oxidation of water. The O-2 evolution activity of CoAl2O4/g-C3N4 from an aqueous solution of AgNO3 under visible light irradiation was similar to 10 times that of unmodified g-C3N4 and also exceeded that of an analogue modified with a well-known Co3O4 cocatalyst for each optimal preparation condition. Transient absorption spectroscopy indicated that the CoAl2O4 cocatalyst with Co2+ as the main cobalt species at the A site of the spinel possessed better hole-capturing properties than the Co3O4 cocatalyst, which was the main reason for the improved water-oxidation performance.

DOI： 10.1021/acscatal.0c00944

Defect-Induced Acceleration and Deceleration of Photocarrier Recombination in SrTiO<inf>3</inf>Powders Reviewed

Kato, K., Yamakata, A., Yamakata, A.

Journal of Physical Chemistry C 124 ( 20 ) 11057 - 11063 2020

Synthesis of three-component C<inf>3</inf>N<inf>4</inf>/rGO/C-TiO<inf>2</inf> photocatalyst with enhanced visible-light responsive photocatalytic deNO<inf>x</inf> activity Reviewed

Noda, C., Asakura, Y., Shiraki, K., Yamakata, A., Yin, S.

Chemical Engineering Journal 390 124616 - 124616 2020

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV}

In order to realize high efficiency photocatalysis deNO(x) effect, a homogeneous three-component photocatalyst, C3N4/rGO/C-TiO2 was successfully synthesized by an in situ synthesis method. First, C3N4/rGO composite was prepared to increase the contact surface between them. Then, C-TiO2 was crystallized on the surface of the C3N4/rGO to obtain relatively dispersed C-TiO2 nanoparticles on the C3N4/rGO. The as-prepared photocatalyst was evaluated by NO removal ratio under weak visible and UV LED light irradiation. C3N4/rGO/C-TiO2 was compared with sample prepared by simple mixing of C3N4, rGO and C-TiO2 within a solution. As a result, sample prepared by in situ synthesis exhibited the highest photocatalytic activity, together with high apparent quantum efficiency. The transient absorption measurement clarified that the composite photocatalyst possessed longer carrier lifetime if compared to that of each component material, resulted to its higher photocatalytic activity. The three-component photocatalyst is thought to have shown enhancement in photocatalytic activity by Z-scheme mechanism with rGO as an electron mediator to improve the performance of Z-scheme.

DOI： 10.1016/j.cej.2020.124616

Nano vs. bulk rutile TiO2:N,F in Z-scheme overall water splitting under visible light Reviewed

Akinobu Miyoshi, Kosaku Kato, Toshiyuki Yokoi, Jan J. Wiesfeld, Kiyotaka Nakajima, Akira Yamakata, Kazuhiko Maeda

Journal of Materials Chemistry A 8 ( 24 ) 11996 - 12002 2020

Enhancement of photoelectrochemical activity of TiO<inf>2</inf> electrode by particulate/dense double-layer formation Invited Reviewed

Hayashi, N., Kato, K., Yamakata, A.

The Journal of chemical physics 152 ( 24 ) 241101 - 241101 2020

Enhancement of UV-responsive photocatalysts aided by visible-light responsive photocatalysts: Role of WO<inf>3</inf> for H<inf>2</inf> evolution on CuCl Reviewed

Takagi, M., Kawaguchi, M., Yamakata, A.

Applied Catalysis B: Environmental 263 118333 - 118333 2020

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV}

WO3 is one of the most popular materials for visible-light photocatalysts. However, its conduction band minimum is too low for water reduction. Here, we found that WO3 can assist water reduction by using visible light in a CuCl2 aqueous solution. Photoirradiation of WO3 in CuCl2 reduces Cu2+ to form indissoluble Cud adducts, and as-produced CuCl/WO3 was active for H-2 evolution under UV-light. This composite has very low reactivity under visible light ( > 400 nm), but visible-light assisted H-2 evolution was observed with simultaneous irradiation with UV light: the activity was increased similar to 1.7 fold. Transient absorption measurements revealed that Z-schematic recombination initially takes place between photogenerated electrons in WO3 and holes in CuCl. As a result, the lifetime of electrons in Cud was increased, enhancing H2 evolution. These results demonstrate that inactive narrow-band gap materials can be used to enhance the activity of wide-band gap materials under sunlight illumination.

DOI： 10.1016/j.apcatb.2019.118333

Fe/Ru Oxide as Versatile and Effective Cocatalyst for Boosting Z-Scheme Water Splitting: Suppressing Undesirable Backward Electron Transfer Reviewed

Akinobu Nakada, Hajime Suzuki, Junie Jhon, M. Vequizo, Kanta Ogawa, Masanobu Higashi, Akinori Saeki, Akira Yamakata, Hiroshi Kageyama, Ryu Abe

ACS Applied Materials & Interfaces 11 ( 49 ) 45606 - 45611 2019.11

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The atificial Z-scheme is a promising and rational strategy for solar-to-chemical energy conversion such as water-splitting. In the Z-scheme, backward redox processes are an essential drawback that should be overcome to increase its efficiency. Here, we demonstrate that the simple co-loading of Fe/Ru oxide, (Fe,Ru)O-x, onto various photocatalysts effectively improves the efficiency of water oxidation by suppressing the undesirable backward oxidation of the redox reagent Fe2+. The (Fe,Ru)O-x co-loading on Bi4TaO8Cl afforded the highest water-splitting activity (apparent quantum efficiency of 1.6% at 420 nm) among the Z-scheme systems employing mixed-anion compounds as O-2-evolving photocatalysts. The results of photoelectrochemical and electrochemical measurements along with time-resolved spectroscopy clarified the key roles of Fe/Ru oxide; the Ru oxide component functions as a "collector" of photogenerated carriers and active sites for surface redox reactions, while the Fe oxide component acts as a "blocker" against unfavorable Fe2+ oxidation. The versatile availability of Fe/Ru oxide has been demonstrated for other visible-light-responsive photocatalysts.

DOI： 10.1021/acsami.9b14802

Achievement of High Photocatalytic Performance to BaTi4O9 toward Overall H2O Splitting Reviewed

Yuichi Hiramachi, Hirotaka Fujimori, Akira Yamakata, Yoshihisa Sakata

ChemCatChem 11 ( 24 ) 6213 - 6217 2019.10

Publishing type：Research paper (scientific journal)

The improvement of photocatalytic activity of BaTi O to overall H O splitting was investigated. From the evaluation of co-catalysts, Rh Cr O was preferable. However, this co-catalyst was degrading with the progress of the photocatalytic reaction. When CoO was co-loaded as the co-catalyst for O evolution reaction over the surface, the steady progress of the photocatalytic reaction can be confirmed. Here, effective way and condition for loading CoO co-catalyst as well as effective preparation method of BaTi O were demonstrated in order to improve the photocatalytic activity of BaTi O with Rh Cr O and CoO co-catalysts to the overall H O splitting. As the results, the photocatalyst prepared by preferable method and condition showed high photocatalytic activity to the overall H O splitting, where the apparent quantum yield (AQY) at 313 nm reached to 41 %. 4 9 2 0.7 1.3 3 x 2 x 4 9 4 9 0.7 1.3 3 x 2 2

DOI： 10.1002/cctc.201901564

Solar-Driven Photoelectrochemical Water Oxidation over an n-Type Lead-Titanium Oxyfluoride Anode Reviewed

Naoki Hirayama, Hiroko Nakata, Haruki Wakayama, Shunta Nishioka, Tomoki Kanazawa, Ryutaro Kamata, Yosuke Ebato, Kosaku Kato, Hiromu Kumagai, Akira Yamakata, Kengo Oka, Kazuhiko Maeda

J. Am. Chem. Soc. 141 ( 43 ) 17158 - 17165 2019.10

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Mixed-anion compounds (e.g., oxynitrides and oxysulfides) are potential candidates as photoanodes for visible-light water oxidation, but most of them suffer from oxidative degradation by photogenerated holes, leading to low stability. Here we show an exceptional example of a stable, mixed-anion water-oxidation photoanode that consists of an oxyfluoride, Pb2Ti2O5.4F1.2, having a band gap of ca. 2.4 eV. Pb2Ti2O5.4F1.2 particles, which were coated on a transparent conductive glass (FTO) support and were subject to postdeposition of a TiO2 overlayer, generated an anodic photocurrent upon band gap photoexcitation of Pb2Ti2O5.4F1.2 (lambda <520 nm) with a rather negative photocurrent onset potential of ca. -0.6 V vs NHE, which was independent of the pH of the electrolyte solution. Stable photoanodic current was observed even without loading a water oxidation promoter such as CoOx,. Nevertheless, loading CoOx onto the TiO2/Pb2Ti2O5.4F1.2/FTO electrode further improved the anodic photoresponse by a factor of 2-3. Under AM1.5G simulated sunlight (100 mW cm(-2)), stable water oxidation to form O-2 was achieved using the optimized Pb2Ti2O5.4R1.2 photoanode in the presence of an applied potential smaller than 1.23 V, giving a Faradaic efficiency of 93% and almost no sign of deactivation during 4 h of operation. This study presents the first example of photoelectrochemical water splitting driven by visible-light excitation of an oxyfluoride that stably works, even without a water oxidation promoter, which is distinct from ordinary mixed-anion photoanodes that usually require a water oxidation promoter.

DOI： 10.1021/jacs.9b06570

Effect of Na-doping on Electron Decay kinetics in SrTiO3 Photocatalyst Reviewed

Kosaku Kato, Junzhe Jiang, Yoshihisa Sakata, Akira Yamakata

ChemCatChem 11 ( 24 ) 6349 - 6354 2019.10

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-V C H VERLAG GMBH

Photocatalytic water splitting by solar light is an environment-friendly means for generating hydrogen as energy resources. For practical use, photocatalysts with higher activity are desired. Recently it was found that the photocatalytic activity of SrTiO3 is remarkably improved by Na-doping. However, why Na-doping enhances the activity has not been well understood. In this work, we found that Na-doping in SrTiO3 introduces new mid-gap states. Transient absorption measurements revealed that photoexcited electrons were trapped into these states within similar to 20 ps after excitation. These trapped electrons have longer lifetime than those in undoped SrTiO3, and number of surviving electrons in microseconds increased similar to 15 times. These electrons are trapped at the mid-gap states, but still keep reactivity with reactant molecules. Furthermore, they were effectively captured by H-2-evolution cocatalyst, indicating that they can participate in steady-state reactions. This work emphasizes the important role of electron-trapping states introduced by doping on photocatalytic activity.

DOI： 10.1002/cctc.201901669

Crucial impact of reduction on the photocarriers dynamics on SrTiO3 powders studied by transient absorption spectroscopy Reviewed

Junie Jhon, M. Vequizo, Shunta Nishioka, Junji Hyodo, Yoshihiro Yamazaki, Kazuhiko Maeda, Akira Yamakata

J. Mater. Chem. A 7 ( 45 ) 26139 - 26146 2019.10

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

Inducing oxygen vacancy defects in SrTiO3 powders via high temperature treatment in the presence of a mixture of Ar, O-2, dry air, and H-2 ambient gases is a promising strategy to produce homogeneously defective SrTiO3 photocatalysts with a remarkable 40-fold enhancement of H-2 evolution activity. Electron doping of SrTiO3 due to oxygen vacancies triggers the development of a highly active SrTiO3 photocatalyst; however, the photodynamic processes involved in these modifications of SrTiO3 have not been fully elucidated yet. In this work, we investigated the impact of high temperature treatment based on the dynamics of photocarriers by transient absorption spectroscopy (TAS). TAS results revealed that upon band gap excitation of SrTiO3, most of the photoexcited electrons in non-reduced SrTiO3 are deeply trapped in the intrinsic defects as evident from the strong broad absorption signals peaking at 11000 cm(-1) (909 nm, 1.36 eV) and 20000 cm(-1) (500 nm, 2.48 eV), whereas the absorption intensities in this wavenumber region largely decreased in highly reduced SrTiO3, suggesting a possible electron filling of deeply trapped states via reduction treatment (or electron doping). Interestingly, the photoexcited electrons in oxygen-deficient SrTiO3 preferably occupy the shallower electron traps. The lowest energy limit of the electron trap filled by photoexcited electrons is estimated to be at the absorption edge located at 1000 cm(-1) (similar to 0.12 eV below the conduction band), which is much shallower than that of non-reduced SrTiO3 (>0.7 eV). Furthermore, it was found that the electron population in the shallow traps in highly reduced SrTiO3 is nearly 2 orders of magnitude higher compared to that in non-reduced SrTiO3, indicating a large improvement in the electron lifetime. The findings herein offer significant insights into the crucial impact of the reduction of SrTiO(3)via induced oxygen vacancy defects to provide available photoexcited electrons that can be readily utilized for the H-2 generation reaction.

DOI： 10.1039/C9TA08216F

Enhanced water splitting through two-step photoexcitation by sunlight using tantalum/nitrogen-codoped rutile titania as a water oxidation photocatalyst Reviewed

Shunta Nishioka, Kei-ichi Yanagisawa, Daling Lu, Junie Jhon, M. Vequizo, Akira Yamakata, Koji Kimoto, Miki Inada, Kazuhiko Maeda

Sustainable Energy & Fuels 3 ( 9 ) 2337 - 2346 2019.7

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

Rutile TiO2 codoped with tantalum and nitrogen (TiO2:Ta,N) was assessed as a water oxidation photocatalyst for Z-scheme water splitting driven by visible light. This material was prepared by thermal ammonolysis of TiO2:Ta with dry NH3 at 773 K, while samples of the oxide precursor were synthesized using a microwave-assisted solvothermal technique, applying various conditions. The photocatalytic activity of the TiO2:Ta,N during water oxidation to O-2 from an aqueous FeCl3 solution was found to be greatly affected by the synthesis parameters. The rate of O-2 evolution was increased upon increasing the level of Ta doping in conjunction with a highly-crystalized TiO2:Ta precursor resulting from applying a higher temperature during synthesis of the oxide. IrO2 loading of the TiO2:Ta,N photocatalyst also improved the O-2 evolution activity. The optimized IrO2/TiO2:Ta,N photocatalyst was applied to a Z-scheme water splitting system in combination with Ru/SrTiO3:Rh and in the presence of redox mediators (Fe3+/2+ or [Co(bpy)(3)](3+/2+)). Under AM1.5G simulated sunlight, this system exhibited a maximum solar-to-hydrogen energy conversion efficiency of 0.039%, which was nearly twice as high as the previously reported system with the use of RuO2/TiO2:Ta,N (0.021%).

DOI： 10.1039/C9SE00289H

Enhanced Visible Light Response of TiO<inf>2</inf> Codoped with Cr and Ta Photocatalysts by Electron Doping Reviewed

Fumiaki Amano, Masashi Nakata, Junie Jhon M. Vequizo, Akira Yamakata

ACS Applied Energy Materials 2 ( 5 ) 3274 - 3282 2019.5

Publishing type：Research paper (scientific journal)

© 2019 American Chemical Society. The importance of electron concentration in rutile TiO2 photocatalysts motivated us to apply H2 reduction treatment to visible-light-responsive TiO2 photocatalysts sensitized by chromium ion doping. We found that H2 reduction treatment of rutile TiO2 particles codoped with Ta and Cr (TiO2:Ta/Cr) enhanced photocatalytic activity for O2 evolution by water oxidation under visible irradiation (>2.2 eV). The enhanced visible light activity of H2-treated TiO2:Ta/Cr was attributed to the increase of electron concentration, which was confirmed by UV-vis diffuse reflectance and electron spin resonance (ESR) spectroscopy. The H2-treated TiO2:Ta/Cr photocatalyst was repeatedly used in aqueous media in spite of the presence of doped electrons. Photoluminescence and transient absorption spectroscopies revealed that electron doping with H2 treatment decreased the midgap states working as deep traps of photoexcited electrons and increased the accumulation of the photoexcited electrons in the conduction band. The optimized H2 reduction temperature was decreased with an increase in the amount of higher valence Ta5+ used as a donor-type dopant. This study shows that the precise control of the bulk electronic structure of rutile TiO2 by a combination of codoping and H2 reduction treatment improves the visible-light-driven photocatalytic activity because of the decrease of the trapping sites at deep energy levels and the recombination between deeply trapped electrons and valence band holes.

DOI： 10.1021/acsaem.9b00126

Construction of Spatial Charge Separation Facets on BaTaO2N Crystals by Flux Growth Approach for Visible-Light-Driven H2 Production Reviewed

Ying Luo, Sayaka Suzuki, Zheng Wang, Kunio Yubuta, Junie Jhon, M. Vequizo, Akira Yamakata, Hiromasa Shiiba, Takashi Hisatomi, Kazunari Domen, Katsuya Teshima

ACS Applied Materials & Interfaces 11 ( 25 ) 22264 - 22271 2019.5

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Low charge separation efficiencies are regarded as obstacles that limit the improvement in the photocatalytic performance of BaTaO2N. In this study, we demonstrated that the anisotropic facets ({100} and {110} facets) of BaTaO2N for efficient spatial charge separation were successfully constructed using the one-pot flux-assisted nitridation approach. As a result, the photocatalytic activity for H-2 production on BaTaO2N with coexposed {100} and {110} facets was nearly 10-fold over that of BaTaO2N with only {100} facets and that of the conventional irregularly shaped sample. This finding provides an innovative approach to the development of efficient (oxy)nitride photocatalysts for solar energy conversion.

DOI： 10.1021/acsami.9b03747

Effect of CuFe2O4 ferrite on photocatalysis and carrier dynamics of electrospun α-Fe2O3 nanofibers by time-resolved transient absorption spectroscopy Reviewed

Pei-Hsuan Hung, Junie Jhon, M. Vequizo, Ren-An Wu, Akira Yamakata, Wenjea J. Tseng

Ceram. Int. 45 ( 12 ) 15676 - 15680 2019.5

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD

Pristine and Cu-doped alpha-Fe2O3 nanofibrous photocatalysts were prepared facilely by electrospinning followed by thermal calcination for removal of the polymeric template. The addition of Cu resulted in formation of copper ferrite (CuFe2O4) in the alpha-Fe2O3 matrix. Photogenerated electrons and holes in the photocatalysts were found trapped in semiconducting midgaps by the time-resolved transient absorption spectroscopy under pulsed light irradiations (355 nm wavelength). The Cu-doped alpha-Fe2O3 showed an increased carriers population when compared to the pristine counterpart. The finding was in good agreement with the methylene-blue (MB) dye degradation under ultraviolet-light irradiations, in which an enhanced MB removal was found for the Cu-doped alpha-Fe2O3 photocatalyst. The MB dye removal was directly correlated with the presence of CuFe2O4 ferrite in the alpha-Fe(2)O(3)matrix; from which, the semiconducting heterojunction at the interface led to a prolonged lifetime of the carriers and a resultant increase on the carriers population and MB photodegradation.

DOI： 10.1016/j.ceramint.2019.05.080

Oxygen-Doped Ta3N5 Nanoparticles for Enhanced Z-Scheme Carbon Dioxide Reduction with a Binuclear Ruthenium(II) Complex under Visible Light Reviewed

Kanemichi Muraoka, Junie Jhon, M. Vequizo, Ryo Kuriki, Akira Yamakata, Tomoki Uchiyama, Daling Lu, Yoshiharu Uchimoto, Osamu Ishitani, Kazuhiko Maeda

ChemPhotoChem 3 ( 10 ) 1027 - 1033 2019.5

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-V C H VERLAG GMBH

Metal-complex/semiconductor hybrids are promising photocatalysts for visible-light CO2 reduction with high selectivity for the formation of a desired product. Herein we applied nanoparticulate Ta3N5/SiO2 as the semiconductor component of a hybrid system with the aid of a binuclear ruthenium(II) complex. The Ta3N5/SiO2 material was prepared by the nitridation of nanoparticulate Ta2O5/SiO2 (which had been previously synthesized by a sol-gel method) under a flow of NH3 gas at 973-1223 K. The synthesized hybrid reduced CO2 into formate with very high selectivity (>99 %) under irradiation with visible light (lambda>480 nm). The activity increased with nitridation temperature up to 1023 K, beyond which it began to drop. The optimized photocatalyst, which consisted of oxygen-doped Ta3N5 as revealed by UV-visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy, exhibited 6 times higher activity than that for an analogous hybrid constructed with bulk Ta3N5. Physicochemical analyses indicated that reducing the defect density by high-temperature nitridation contributed to the suppression of charge recombination, which resulted in higher activity of Ta3N5/SiO2, while a nitridation temperature that was too high was undesirable because of a decrease in the reactivity of photogenerated holes due to a loss of the doped oxygen content in Ta3N5.

DOI： 10.1002/cptc.201900120

Improvement of photocatalytic activity under visible-light irradiation by heterojunction of Cu ion loaded WO3 and Cu ion loaded N-TiO2 Reviewed

Tomoya Iihoshi, Takeshi Ohwaki, Junie Jhon, M. Vequizo, Akira Yamakata

Applied Catalysis B: Environmental 248 249 - 254 2019.2

Sodium titanium oxide bronze nanoparticles synthesized via concurrent reduction and Na+-doping into TiO2(B) Reviewed

Hasegawa, George, Tanaka, Moeko, Vequizo, Junie Jhon M., Yamakata, Akira, Hojo, Hajime, Kobayashi, Makoto, Kakihana, Masato, Inada, Miki, Akamatsu, Hirofumi, Hayashi, Katsuro

NANOSCALE 11 ( 3 ) 1442 - 1450 2019.1

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

A mixed valence compound, sodium titanium oxide bronze (NaxTiO2-B), combines intriguing properties of high electric conductivity and good chemical stability together with a unique one-dimensional tunnel crystal structure available for cation storage. However, this compound has not been studied for a long period because of the strongly reductive condition at high temperature required for its preparation, which limits the morphological control such as the preparation of nanocrystals. For the first time in this paper, the topotactic synthesis of nano-sized NaxTiO2-B with high specific surface area (>130 m(2) g(-1)) from TiO2(B) nanoparticles has been demonstrated. The reaction of metastable TiO2(B) with NaBH4 allows carrier electrons to be doped simultaneously with incorporation of Na+ ions into the interstitial sites of the host Ti-O lattice at relatively low temperature. An electrochemical investigation of Li+- and Na+-ion storage behaviors suggests that the incorporated Na+ ions are mainly placed in the 6-fold coordination sites of bronze. In addition, optical measurements including time-resolved transient spectroscopy revealed that the doped electrons in the NaxTiO2-B nanoparticles are predominantly in the Ti3+ state and behave as a small polaron. The pelletized NaxTiO2-B nanoparticles shows a good electronic conductivity of 1.4 x 10(-2) S cm(-1) at 30 degrees C with an activation energy of 0.17 eV, which is attributable to the thermal barrier for the polaron hopping.

DOI： 10.1039/c8nr08372j

Clear and transparent nanocrystals for infrared-responsive carrier transfer Reviewed

Sakamoto, M., Kawawaki, T., Kimura, M., Vequizo, J.J.M., Matsunaga, H., Ranasinghe, C.S.K., Yamakata, A., Matsuzaki, H., Furube, A., Teranishi, T.

Nature communications 10 ( 1 ) 406 - 406 2019

Near infrared light induced plasmonic hot hole transfer at a nano-heterointerface Reviewed

Zichao Lian, Masanori Sakamoto, Hironori Matsunaga, Junie Jhon M. Vequizo, Akira Yamakata, Mitsutaka Haruta, Hiroki Kurata, Wataru Ota, Tohru Sato, Toshiharu Teranishi

Nature Communications 9 ( 1 ) 2314 - 2314 2018.12

Language：English Publishing type：Research paper (scientific journal) Publisher：Nature Publishing Group

Localized surface plasmon resonance (LSPR)-induced hot-carrier transfer is a key mechanism for achieving artificial photosynthesis using the whole solar spectrum, even including the infrared (IR) region. In contrast to the explosive development of photocatalysts based on the plasmon-induced hot electron transfer, the hole transfer system is still quite immature regardless of its importance, because the mechanism of plasmon-induced hole transfer has remained unclear. Herein, we elucidate LSPR-induced hot hole transfer in CdS/CuS heterostructured nanocrystals (HNCs) using time-resolved IR (TR-IR) spectroscopy. TR-IR spectroscopy enables the direct observation of carrier in a LSPR-excited CdS/CuS HNC. The spectroscopic results provide insight into the novel hole transfer mechanism, named plasmon-induced transit carrier transfer (PITCT), with high quantum yields (19%) and long-lived charge separations (9.2 μs). As an ultrafast charge recombination is a major drawback of all plasmonic energy conversion systems, we anticipate that PITCT will break the limit of conventional plasmon-induced energy conversion.

DOI： 10.1038/s41467-018-04630-w

Curious Behaviors of Photogenerated Electrons and Holes at the Defects on Anatase, Rutile, and Brookite TiO2 Powders: A Review Invited Reviewed

Akira Yamakata, Junie Jhon, M. Vequizo

J. Photochem. Photobiol. C-Photochem. Rev. 40 234 - 243 2018.12

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER

Photocatalytic reactions are governed by photogenerated charge carriers upon band gap excitation. Therefore, for better understanding of the mechanism, the dynamics of photocarriers should be studied. One of the attractive materials is TiO2, which has been extensively investigated in the field of photocatalysis. This review article summarizes our recent works of time-resolved visible to mid-IR absorption measurements to elucidate the difference of anatase, rutile, and brookite TiO2 powders. The distinctive photocatalytic activities of these polymorphs are determined by the electron-trapping processes at the defects on powders. Powders are rich in defects and these defects capture photogenerated electrons. The depth of the trap is crystal phase dependent, and they are estimated to be < 0.1 eV, similar to 0.4 eV and similar to 0.9 eV for anatase, brookite, and rutile, respectively. Electron trapping reduces probability to meet with holes and then elongate the lifetime of holes. Therefore, it works negatively for the reaction of electrons but positively works for the reaction of holes. In the steady-state reactions, both electrons and holes should be consumed. Hence, the balance between the positive and negative effects of defects determines the distinctive photocatalytic activities of anatase, rutile, and brookite TiO2 powders. (C) 2018 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jphotochemrev.2018.12.001

Plasmonic p–n Junction for Infrared Light to Chemical Energy Conversion Reviewed

Zichao Lian, Masanori Sakamoto, Junie Jhon, M. Vequizo, Chandana Sampath, Kumara Ranasinghe, Akira Yamakata, Takuro Nagai, Koji Kimoto, Yoichi Kobayashi, Naoto Tamai, Toshiharu Teranishi

J. Am. Chem. Soc. 141 ( 6 ) 2446 - 2450 2018.12

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Infrared (IR) light represents an untapped energy source accounting for almost half of all solar energy. Thus, there is a need to develop systems to convert IR light to fuel and make full use of this plentiful resource. Herein, we report photocatalytic H-2 evolution driven by near- to shortwave-IR light (up to 2500 nm) irradiation, based on novel CdS/Cu7S4 heterostructured nanocrystals. The apparent quantum yield reached 3.8% at 1100 nm, which exceeds the highest efficiencies achieved by IR light energy conversion systems reported to date. Spectroscopic results revealed that plasmon-induced hot electron injection at p-n heterojunctions realizes exceptionally long-lived charge separation (>273 mu s), which results in efficient IR light to hydrogen conversion. These results pave the way for the exploration of undeveloped low-energy light for solar fuel generation.

DOI： 10.1021/jacs.8b11544

Expansion of the photoresponse window of a BiVO4 photocatalyst by doping with chromium(VI) Reviewed

Kazuya Okuno, Hideki Kato, Junie Jhon, M. Vequizo, Akira Yamakata, Hisayoshi Kobayashi, Makoto Kobayashi, Masato Kakihana

RSC Advances 8 ( 67 ) 38140 - 38145 2018.11

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

Doping of Cr6+ into BiVO4 was examined in this study. A new absorption band with a 1.84 eV energy threshold appeared with Cr-doping. The theoretical band calculation has revealed that the new absorption is ascribed to the electron transition from the valence band to acceptor levels formed by empty Cr 3d orbitals. It was confirmed that photocatalytic water oxidation in the presence of Ag+ or Fe3+ of an oxidizing reagent was induced by excitation of the new absorption although activity under band gap excitation decreased with Cr-doping. Characteristics of carrier dynamics were also investigated by transient absorption spectroscopy.

DOI： 10.1039/C8RA07830K

A Copolymerization Approach to Improving Ru(II)-Complex/C3N4 Hybrid Photocatalysts for Visible-Light CO2 Reduction Reviewed

Constantine Tsounis, Ryo Kuriki, Kengo Shibata, Junie Jhon, M. Vequizo, Daling Lu, Akira Yamakata, Osamu Ishitani, Rose Amal, Kazuhiko Maeda

ACS Sustainable Chemistry & Engineering 6 ( 11 ) 15333 - 15340 2018.10

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Copolymerized carbon nitride nanosheets (NS-C3N4) were used as a light absorbing unit while paired with a Ru(II) complex that served as a catalyst for CO2 reduction, forming a hybrid photocatalytic system. Copolymerization with urea and phenylurea in air at 823 K resulted in a carbon nitride material that had wide visible light absorption extending to 650 nm, significantly red-shifted compared to the absorption edge of pristine NS-C3N4, an analogue prepared with only urea (ca. 435 nm). While a hybrid system consisting of pristine NS-C3N4 was found to be inactive under longer wavelength visible light (lambda > 500 nm) due to its large band gap, the copolymerized material was able to catalytically convert CO2 to HCOOH under lambda > 500 nm irradiation. Furthermore, its activity toward HCOOH production is doubled under lambda > 400 nm irradiation after 5 h compared to pristine NS-C3N4. Transient absorption spectroscopy clearly showed improved lifetime of photogenerated free (and/or shallowly trapped) electrons, which should be the key to enhancing the photocatalytic activity of this hybrid system even under shorter wavelength visible light.

DOI： 10.1021/acssuschemeng.8b03782

Effects of Interfacial Electron Transfer in Metal Complex−Semiconductor Hybrid Photocatalysts on Z‑Scheme CO2 Reduction under Visible Light Reviewed

Akinobu Nakada, Ryo Kuriki, Keita Sekizawa, Shunta Nishioka, Junie Jhon, M. Vequizo, Tomoki Uchiyama, Nozomi Kawakami, Daling Lu, Akira Yamakata, Yoshiharu Uchimoto, Osamu Ishitani, Kazuhiko Maeda

ACS Catalysis 8 ( 10 ) 9744 - 9754 2018.9

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The Z-scheme CO2 reduction activity of metal complex-semiconductor hybrid photocatalysts was investigated in detail with a focus on the interfacial electron transfer process. Semiconductors of GaN:ZnO solid solutions, TaON, and Ta/N-codoped TiO2 were examined as components of the hybrid photocatalyst in combination with a binuclear Ru(II) complex. The (photo)physical properties of the semiconductor part were found to strongly affect the efficiency of interfacial electron transfer from/to the Ru complex photosensitizer unit, which was attached to the semiconductor surface. The photocatalytic activity of the hybrids showed a reasonable relationship with the efficiencies of forward and backward electron transfer. Among the three semiconductors, the highest activity was obtained with GaN:ZnO, which had the most negative conduction band potential among the semiconductors examined. The experimental results clearly demonstrated that analyses of the emission quenching process of the excited photosensitizer moiety of the binuclear Ru(II) complex allowed visualization of the interfacial electron transfer between the semiconductor and the Ru complex, giving us a rational guideline to improve the efficiency of the hybrid photocatalyst for Z-scheme CO2 reduction.

DOI： 10.1021/acscatal.8b03062

Undoped Layered Perovskite Oxynitride Li2 LaTa2 O6 N for Photocatalytic CO2 Reduction with Visible Light. Reviewed International journal

Takayoshi Oshima, Tom Ichibha, Ken Sinkou Qin, Kanemichi Muraoka, Junie Jhon M Vequizo, Keisuke Hibino, Ryo Kuriki, Shunsuke Yamashita, Kenta Hongo, Tomoki Uchiyama, Kotaro Fujii, Daling Lu, Ryo Maezono, Akira Yamakata, Hideki Kato, Koji Kimoto, Masatomo Yashima, Yoshiharu Uchimoto, Masato Kakihana, Osamu Ishitani, Hiroshi Kageyama, Kazuhiko Maeda

Angewandte Chemie (International ed. in English) 57 ( 27 ) 8154 - 8158 2018.7

Language：English Publishing type：Research paper (scientific journal)

Oxynitrides are promising visible-light-responsive photocatalysts, but their structures are almost confined with three-dimensional (3D) structures such as perovskites. A phase-pure Li2 LaTa2 O6 N with a layered perovskite structure was successfully prepared by thermal ammonolysis of a lithium-rich oxide precursor. Li2 LaTa2 O6 N exhibited high crystallinity and visible-light absorption up to 500 nm. As opposed to well-known 3D oxynitride perovskites, Li2 LaTa2 O6 N supported by a binuclear RuII complex was capable of stably and selectively converting CO2 into formate under visible light (λ>400 nm). Transient absorption spectroscopy indicated that, as compared to 3D oxynitrides, Li2 LaTa2 O6 N possesses a lower density of mid-gap states that work as recombination centers of photogenerated electron/hole pairs, but a higher density of reactive electrons, which is responsible for the higher photocatalytic performance of this layered oxynitride.

DOI： 10.1002/anie.201803931

Binary flux-promoted formation of trigonal ZnIn2S4 layered crystals using ZnS-containing industrial waste and their photocatalytic performance for H2 production Reviewed

Mirabbos Hojamberdiev, Yanfei Cai, Junie Jhon, M. Vequizo, Mohammad Mansoob Khan, Ronald Vargas, Kunio Yubuta, Akira Yamakata, Katsuya Teshima, Masashi Hasegawa

Green Chemistry 20 ( 16 ) 3845 - 3856 2018.7

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

The accumulation of solid waste due to rapid industrialization has a negative impact on the environment. In this study, ZnS-containing waste from the mining-metallurgy industry was utilized for the synthesis of trigonal ZnIn2S4 layered crystals by a flux method using various binary fluxes: CaCl2:InCl3, SrCl2:InCl3, BaCl2:InCl3, NaCl:InCl3, KCl:InCl3, and CsCl:InCl3. Among the binary fluxes used, KCl:InCl3 was found to be the most favorable for the synthesis of phase-pure trigonal ZnIn2S4 layered crystals. The XRD and SEM results revealed that the flux-grown ZnIn2S4 crystals have a trigonal structure and a morphology composed of large stacked layers. Unexpectedly, the UV-vis diffuse reflectance spectrum exhibited the onset of the absorption edge at approximately 700 nm for trigonal ZnIn2S4 crystals. The photocatalytic activities for H-2 production of the Pt-photodeposited ZnIn2S4 samples grown using CaCl2:InCl3, NaCl:InCl3, and KCl:InCl3 fluxes were evaluated. Trigonal ZnIn2S4 crystals grown using the KCl:InCl3 flux in this study exhibited higher photocatalytic activity for H-2 evolution (132 mu mol h(-1)) than previously reported hexagonal ZnIn2S4 synthesized by a hydrothermal method due to the decreased defect density and higher crystallinity achieved by the binary flux method. The presence of secondary crystalline phases (ZnS and In2S3) in ZnIn2S4 crystals grown using NaCl:InCl3 and CaCl2:InCl3 fluxes positively impacted the photocatalytic activity and exhibited photocatalytic H-2 evolution rates of 188 and 232 mu mol h(-1), respectively, because of the efficient separation and transfer of photogenerated charge carriers. The decay of the transient absorption of electrons in three samples at 2000 cm(-1) was monitored by transient absorption spectroscopy, confirming that the lifetime of free electrons becomes longer depending on the binary flux used: KCl:InCl3 < NaCl:InCl3 < CaCl2:InCl3. The binary flux method applied in this study demonstrates that accumulated solid industrial wastes can be turned into beneficial photocatalytic materials.

DOI： 10.1039/C8GC01746H

Enhanced photocatalytic NOx decomposition of visible-light responsive F-TiO2/(N,C)-TiO2 by charge transfer between F-TiO2 and (N,C)-TiO2through their doping levels Reviewed

Shio Komatsuda, Yusuke Asakura, Junie Jhon, M. Vequizo, Akira Yamakata, Shu Yin

Appl. Catal. B-Environ. 238 358 - 364 2018.7

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Composite type photocatalyst F-TiO2/(N,C)-TiO2 consisted of anatase-type TiO2 with fluorine-doping (F-TiO2) and TiO2 with nitrogen and carbon-doping ((N,C)-TiO2) was prepared by simple physical mixing to exhibit higher visible-light responsive photocatalytic nitrogen oxide (NO) decomposition activity than those of F-TiO2 and (N,C)-TiO2. Transient absorption measurement clarified that the composite possessed longer carrier lifetime compared to that of each material (F-TiO2 or (N,C)-TiO2), resulting in higher photocatalytic activity. In the composite, photoexcited holes and electrons, which are not in impurity level but in valence and conduction band, respectively, should photocatalytically decompose NO, judging from the redox potential of O-2/O-2(center dot-) and the band positions of F-TiO2 and (N,C)-TiO2. The mechanism for higher visible-light photocatalytic activity, or longer carrier lifetime can be explained by charge transfer between F-TiO2 and (N,C)-TiO2 through their impurity levels. The charge transfer should make photoexcited carries spatially separated to enhance the photo catalytic activity.

DOI： 10.1016/j.apcatb.2018.07.038

Excited-State Dynamics of Graphitic Carbon Nitride Photocatalyst and Ultrafast Electron Injection to a Ru(II) Mononuclear Complex for Carbon Dioxide Reduction Reviewed

Ryo Kuriki, Chandana Sampath, Kumara Ranasinghe, Yasuomi Yamazaki, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda

J. Phys. Chem. C. 122 ( 29 ) 16795 - 16802 2018.6

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

We have previously developed photocatalytic CO, reduction systems using graphitic carbon nitride (g-C3N4) and a Ru(II) mononuclear complex (e.g., trans(Cl)-[Ru-II{4,4'-(H2PO3)(2) bpy}(2)(CO)(2)Cl-2] bpy = 2,2'-bipyridine, abbreviated as RuP) hybrids and demonstrated its high activities under visible light (lambda > 400 nm). To understand the excited-state dynamics of C3N4 and electron-transfer process to RuP, here we examined the photophysical properties of g-C3N4 as well as mesoporous g-C3N4 (mpg-C3N4) by means of time-resolved emission and/or time-resolved infrared absorption (TR-IR) spectroscopy. The emission decay measurements showed that g-C3N4 (as well as mpg-C3N4) has at least three emissive excited states with different lifetimes (g-C3N4; 1.3 +/- 0.4, 3.9 +/- 0.9, and 15 +/- 4 ns at 269 nm photoexcitation) in aqueous suspension. These excited states were not quenched upon addition of a hole scavenger (e.g., disodium dihydrogen ethylenediamine tetraacetate dehydrate) and/or an electron acceptor (RuP), even though photochemical electron-transfer processes from/to g-C3N4 has been experimentally confirmed by photocatalytic reactions. On the other hand, TR-IR spectroscopy clearly indicated that mobile electrons photogenerated in mpg-C3N4, which are shallowly trapped and/or free electron in the conduction band, are able to move into RuP with a timescale of a few picoseconds. These results suggest that main emission centers and reaction sites (including charge-transfer interfaces) are separately located in the C3N4 materials, and that electron transfer from C3N4 to RuP progresses through less- or non-luminescent sites, in which mobile electrons exist with a certain lifetime.

DOI： 10.1021/acs.jpcc.8b03996

Homogeneous Electron Doping into Non-Stoichiometric Strontium Titanate Improves Its Photocatalytic Activity for Hydrogen and Oxygen Evolution Reviewed

Shunta Nishioka, Junji Hyodo, Junie Jhon, M. Vequizo, Shunsuke Yamashita, Hiromu Kumagai, Koji Kimoto, Akira Yamakata, Yoshihiro Yamazaki, Kazuhiko Maeda

ACS Catal. 8 ( 8 ) 7190 - 7200 2018.6

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Water splitting using a semiconductor photocatalyst has been extensively studied as a means of solar-to-hydrogen energy conversion. Powder-based semiconductor photocatalysts, in particular, have tremendous potential in cost mitigation due to system simplicity and scalability. The control and implementation of powder-based photocatalysts are, in reality, quite complex. The identification of the semiconductorphotocatalytic activity relationship and its limiting factor has not been fully solved in any powder-based semiconductor photocatalyst. In this work, we present systematic and quantitative evaluation of photocatalytic hydrogen and oxygen evolution using a model strontium titanate powder/aqueous solution interface in a half reaction. The electron density was controlled from 10(16) to 1(02)0 cm(3) throughout the strontium titanate powder by charge compensation with oxygen nonstoichiometry (the amount of oxygen vacancy) while maintaining its crystallinity, chemical composition, powder morphology, and the crystal and electronic structure of the surface. The photocatalytic activity of hydrogen evolution from aqueous methanol solution was stable and enhanced by 40-fold by the electron doping. The enhancement was correlated well with increased Delta absorbance, an indication of prolonged lifetime of photoexcited electrons, observed by transient absorption spectroscopy. Photocatalytic activity of oxygen evolution from aqueous silver nitrate solution was also enhanced by 3-fold by the electron doping. Linear correlation was found between the photocatalytic activity and the degree of surface band bending, Delta Phi, above 1.38 V. The band bending, potential downhill for electronic holes, enlarges the total flux of photoexcited holes toward the surface, which drives the oxygen evolution reaction.

DOI： 10.1021/acscatal.8b01379

Fabrication of robust TiO2 thin films by atomized spray pyrolysis deposition for photoelectrochemical water oxidation Reviewed

Chandana Sampath Kumara Ranasinghe, Junie Jhon M. Vequizo, Akira Yamakata

Journal of Photochemistry and Photobiology A: Chemistry 358 320 - 326 2018.5

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier B.V.

Photoelectrodes are highly essential for the photoelectrochemical water splitting process and development of novel fabrication techniques is vital for further enhancement of activity. In this study, we successfully fabricated highly active TiO2 thin films by using novel atomized spray pyrolysis deposition (ASPD) technique. The ASPD technique utilizes a unique atomization process to produce highly fine aerosols which resulted in a highly crystalline TiO2 nanostructure. The deposition process was optimized by controlling deposition temperatures and precursor amounts. XRD and SEM studies confirmed the formation of anatase TiO2 phase and a highly interconnected nano-flakes on FTO substrate at 550 °C. The photoelectrochemical activity of the optimized thin films showed a photocurrent density of ∼5 mA cm−2 at 1.0 V (vs. Ag/AgCl) in 0.1 M Na2SO4 (aq) under 375 nm (150 mW cm−2) illumination. This photocurrent was much higher than the two other anatases TiO2 thin films fabricated by conventional spray pyrolysis deposition (SPD) using the same precursor and anatase TiO2 powder (particle size ∼21 nm). Transient IR absorption study revealed that the SPD powder based thin films have deeply trapped electrons, whereas ASPD thin films consisted with only free and/or shallowly trapped electrons. Higher crystallinity and enhanced electron conductivity of the TiO2 thin films fabricated by ASPD are responsible for this stable and high photoelectrochemical activity.

DOI： 10.1016/j.jphotochem.2017.09.006

Role of CoOx cocatalyst on Ta3N5 photocatalysts studied by transient visible to mid-infrared absorption spectroscopy Reviewed

Junie Jhon M. Vequizo, Mirabbos Hojamberdiev, Katsuya Teshima, Akira Yamakata

Journal of Photochemistry and Photobiology A: Chemistry 358 315 - 319 2018.5

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier B.V.

Tantalum nitride (Ta3N5) photocatalysts attract considerable attention owing to their visible light absorption below 600 nm and suitable band structures for reduction and oxidation of water to generate hydrogen and oxygen gas. Herein, we investigated the effects of CoOx on the dynamics of photogenerated charge carriers in Ta3N5 powder photocatalysts by using microsecond to millisecond transient visible to mid-IR absorption spectroscopy. Transient absorption measurements revealed that most of the electrons in Ta3N5 are deeply trapped at the defects, most likely originating from oxygen vacancies and reduced Ta species. Two important roles of CoOx were elucidated: effective capture of holes to prolong electron lifetime and reduction of defects as recombination centers, which further elongates the lifetime of both electrons and holes.

DOI： 10.1016/j.jphotochem.2017.09.005

Structural changes of water molecules during photoelectrochemical water oxidation on TiO2 thin film electrodes Reviewed

Chandana Sampath Kumara Ranasinghe, Akira Yamakata

Physical Chemistry Chemical Physics 20 ( 5 ) 3388 - 3394 2018.2

Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry

Behaviors of photogenerated charge carriers and structural changes of water molecules on TiO2 photoelectrodes were investigated by using time-resolved visible to mid-IR absorption spectroscopy. From the spectra measured in the visible to NIR region, it was shown that the lifetime of trapped electrons and holes becomes longer upon applying more positive potentials. This result was reasonably explained by the enhancement of the upward band bending at the water/TiO2 interface. On the other hand, from the spectra measured in the mid-IR region, structural changes of the water molecules were observed. When a TiO2 electrode was photoexcited at the potential where the water oxidation starts, a new absorption peak appeared at 3620 cm-1 with a slight decrease in the intensity of hydrogen-bonded water. This new peak was assigned to the isolated O-H band of water molecules. Usually, TiO2 surfaces exhibit super-hydrophilic properties with strong hydrogen-bonding
however, the obtained result was opposite. Therefore, the appearance of this isolated O-H band was ascribed to the cleavage of the hydrogen-bonding networks resulting from the production of reaction intermediates such as OH radicals or H2O2. The intensity of the isolated O-H decreases when applying more positive potentials, where the O2 evolution proceeds more efficiently. This could be ascribed to the rapid consumption of the reaction intermediates. At these potentials, the intensity of hydrogen-bonded water was also further decreased.

DOI： 10.1039/c7cp06646e

Oxygen induced enhancement of NIR emission in brookite TiO2 powders: Comparison with rutile and anatase TiO2 powders Reviewed

Junie Jhon M. Vequizo, Sunao Kamimura, Teruhisa Ohno, Akira Yamakata

Physical Chemistry Chemical Physics 20 ( 5 ) 3241 - 3248 2018.2

Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry

Brookite TiO2 attracts considerable attention in photocatalysis owing to its superior performance in several photocatalytic reactions. In this work, we investigated the behavior of charge carriers in brookite, rutile, and anatase TiO2 by using photoluminescence (PL) and transient absorption (TA) spectroscopies. PL measurements revealed that brookite TiO2 exhibits a visible and a NIR emission at ∼520 nm and ∼860 nm, respectively. Addition of methanol vapor quenched both the visible and NIR emissions by the hole-consuming reaction of methanol. However, exposure to O2 shows curious behaviors: the visible emission was quenched but the NIR emission was enhanced. These results can be accounted for by the enhancement of upward band bending resulting in the effective separation of electrons and holes into the bulk and the surface, respectively. Furthermore, the shallowly trapped electrons, which are responsible for visible PL, are consumed by O2
hence, the visible emission is quenched. However, in the case of NIR emission, the deeply trapped electrons are responsible and they are mainly located at the surface defects. The O2 adsorption promotes the hole accumulation at the surface and then assists the recombination of these deeply trapped electrons, resulting in the enhancement of the NIR emission. We also found that the lifetime of NIR emission (τ1 = 43 ± 0 ns and τ2 = 589 ± 1 ns) was much longer than that of visible emission (τ1 = 15 ± 0 ns and τ2 = 23 ± 0 ns), since the mobility of these deeply trapped electrons to encounter with holes is lower than that of the shallowly trapped electrons. However, even for this slow NIR emission, the actual lifetime of the deeply trapped electrons estimated by TA (1.5 ± 0.0 μs and 17 ± 0 μs) was one or two orders of magnitude longer, confirming that non-radiative recombination is dominant and it is much slower than radiative recombination: TAS and PL provide detailed information on the radiative and non-radiative recombination processes. The PL of anatase and rutile TiO2 powders was also measured and the difference from brookite TiO2 was discussed.

DOI： 10.1039/c7cp06975h

Visible-light CO2 reduction over a ruthenium(ii)-complex/C3N4 hybrid photocatalyst: The promotional effect of silver species Reviewed

Kazuhiko Maeda, Daehyeon An, Chandana Sampath Kumara Ranasinghe, Tomoki Uchiyama, Ryo Kuriki, Tomoki Kanazawa, Daling Lu, Shunsuke Nozawa, Akira Yamakata, Yoshiharu Uchimoto, Osamu Ishitani

Journal of Materials Chemistry A 6 ( 20 ) 9708 - 9715 2018

Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry

Hybrid photocatalysts constructed with a mononuclear Ru(ii)-complex (RuP), silver nanoparticles, and carbon nitride nanosheets (NS-C3N4) photocatalyze CO2 reduction to selectively form formate under visible light. The structure of the nanoparticulate silver species, which worked as promoters for the reaction, was characterized by X-ray diffraction, UV-VIS diffuse reflectance spectroscopy, high-resolution transmission microscopy, and X-ray absorption fine-structure spectroscopy. The silver promoters were loaded on the surface of NS-C3N4 by an impregnation method from an aqueous solution containing AgNO3 or an in situ photodeposition method. Impregnation of NS-C3N4 with 2.0 wt% Ag followed by reduction with H2 at 473 K (further modified with RuP) resulted in the highest photocatalytic activity, giving a turnover number of 5700 (based on RuP), which was the greatest value among the formate-generating hybrid systems with a mononuclear complex. While the optimized photocatalyst contained highly dispersed Ag2O-like nanoclusters as the major silver species, experimental results suggested that highly dispersed Ag0 species are more important for enhancing CO2 reduction activity, that is, the obtained experimental results led us to conclude that there are two major factors affecting activity: one is the feature size of silver species (smaller is better), and the other is the oxidation state of silver (metallic is better).

DOI： 10.1039/c8ta03245a

Nitrogen/fluorine-codoped rutile titania as a stable oxygen-evolution photocatalyst for solar-driven Z-scheme water splitting Reviewed

Akinobu Miyoshi, Junie Jhon M. Vequizo, Shunta Nishioka, Yuma Kato, Muneaki Yamamoto, Shunsuke Yamashita, Toshiyuki Yokoi, Akihide Iwase, Shunsuke Nozawa, Akira Yamakata, Tomoko Yoshida, Koji Kimoto, Akihiko Kudo, Kazuhiko Maeda

Sustainable Energy & Fuels 2 2025 - 2035 2018

Engaging the flux-grown La1-xSrxFe1-yTiyO3 crystals in visible-light-driven photocatalytic hydrogen generation Reviewed

Mirabbos Hojamberdiev, Kenta Kawashima, Mahesh Kumar, Akira Yamakata, Kunio Yubuta, Aleksander Gurlo, Masashi Hasegawa, Kazunari Domen, Katsuya Teshima

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 42 ( 44 ) 27024 - 27033 2017.11

Language：English Publishing type：Research paper (scientific journal) Publisher：PERGAMON-ELSEVIER SCIENCE LTD

Perovskite LaFeO3 is regarded as one of the promising photocatalysts for solar splitting of water to hydrogen and oxygen due to its suitable band edge positions, visible light absorbance, and high chemical stability. To further improve its photocatalytic performance of LaFeO3, the effects of solute concentration in the KCl-flux growth and partial A- and B-site substitution are investigated in this work. Controlling the solute concentration in the range of 1-20 mol% is crucial to grow phase-pure LaFeO3 crystals with idiomorphic shape. With increasing the solute concentration, the flux-based growth route gradually changes to a solid state-based growth route because of a decrease in solubility and an increase in the crystallization core number. The La1-xSrxFe1-yTiyO3 (x,y = 0,0; 0,0.15; 0.15,0; 0.1125,0.0375; 0.0375,0.1125; and 0.075,0.075) crystals were also synthesized by a KCl-flux method to explore the effect of partial Sr2+-to-La3+ and/or Ti4+-to-Fe2-4+ substitution on photocatalytic performance of LaFeO3. The Sr2+ Ti4+ co-substitution is found to enhance the photocatalytic performance of LaFeO3 as compared with the corresponding individual substitution (Sr2+ or Ti4+). The highest photocatalytic hydrogen generation rate (83.2 mu mol h(-1)) was observed for Pt-photodeposited La0.925SF0.075Fe0.925Ti0.075O3 crystals in 5-h reaction due to the improvement of both bulk properties and photoactivity and the reduction in both grain boundaries and lattice defects stemmed from the Sr2+-Ti4+ co-substitution and KCl flux growth. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.ijhydene.2017.09.036

Cation-dependent restructure of the electric double layer on CO-covered Pt electrodes: Difference between hydrophilic and hydrophobic cations Reviewed

Akira Yamakata, Masatoshi Osawa

JOURNAL OF ELECTROANALYTICAL CHEMISTRY 800 19 - 24 2017.9

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE SA

Structural changes in water layers on a CO-covered Pt electrode triggered by rapid pulsed laser heating of the interface are studied using potential transient measurements. When the laser energy density is below 20 mJ cm(-2), the water layers undergo a change in orientation, which causes a negative shift in the rest potential that recovers within 20 ps with the cooling of the interface. In contrast, when the laser intensity exceeds 20 mJ cm(-2), the CO is desorbed and the rest potential first experiences a positive shift, which is followed by a negative shift. This positive shift is caused by replacement of the CO by water and subsequent restructuring of the water layer. The restructuring rate depends strongly on the electrolyte cation: the rest potential reaches a maximum value within 100 ps for hydrophilic cations such as H+ and Li+, whereas it takes >10 ms for hydrophobic cations such as Et4N+ and Bu4N+. Surface-enhanced IR absorption measurements suggest that the water molecules around the hydrophobic cations are more strongly hydrogen-bonded than those around the hydrophilic cations. Because the restructuring involves a reforming of the hydrogen-bonding network at the electric double layer, Et4N+ and Bu4N+, which have more strongly hydrogen-bonded hydration shells, require more time than H+ and Li+. (C) 2016 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jelechem.2016.12.034

Elucidating the impact of A-site cation change on photocatalytic H-2 and O-2 evolution activities of perovskite-type LnTaON(2) (Ln = La and Pr) Reviewed

Mirabbos Hojamberdiev, Maged F. Bekheet, Judy N. Hart, Junie Jhon M. Vequizo, Akira Yamakata, Kunio Yubuta, Aleksander Gurlo, Masashi Hasegawa, Kazunari Domen, Katsuya Teshima

PHYSICAL CHEMISTRY CHEMICAL PHYSICS 19 ( 33 ) 22210 - 22220 2017.9

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

Transition metal (oxy) nitrides with perovskite-type structures have been regarded as one of the promising classes of inorganic semiconductor materials that can be used in solar water splitting systems for the production of hydrogen as a renewable and storable energy carrier. The performance of transition metal (oxy) nitrides in solar water splitting is strongly influenced by the crystal structure-related dynamics of photogenerated charge carriers. Here, we have systematically assessed the influence of A-site cation exchange on the visible-light-induced photocatalytic H-2 and O-2 evolution activities, photoanodic response, and dynamics of photogenerated charge carriers of perovskite-type LnTaON(2) (Ln = La and Pr). The structural refinement results reveal the orthorhombic Imma and Pnma structures for LaTaON2 and PrTaON2, respectively; the latter has a more distorted crystal structure from the ideal cubic perovskite due to the smaller size of Pr3+ cations. Compared with LaTaON2, PrTaON2 exhibits lower photocatalytic H-2 and O-2 gas evolution activities and photoanodic response owing to an excessive amount of intrinsic defects associated with anionic vacancies and reduced tantalum species stemming from a long high-temperature nitridation process under reductive NH3 atmosphere. Transient absorption signals evidence the faster decay of photogenerated electrons (holes) in Pt (CoOx)-loaded LaTaON2 than that in Pt (CoOx)-loaded PrTaON2, consistent with the photocatalytic and photoelectrochemical performance of the two photocatalysts. This study suggests that in addition to selecting a suitable A-site cation, it is prerequisite to synthesize LnTaON(2) (Ln = La and Pr) crystals with a low defect density to improve their photo-conversion efficiency for solar water splitting.

DOI： 10.1039/c7cp03714g

Interfacial Manipulation by Rutile TiO2 Nanoparticles to Boost CO2 Reduction into CO on a Metal-Complex/Semiconductor Hybrid Photocatalyst Reviewed

Keisuke Wada, Chandana Sampath Kumara Ranasinghe, Ryo Kuriki, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda

ACS APPLIED MATERIALS & INTERFACES 9 ( 28 ) 23869 - 23877 2017.7

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Metal-complex/semiconductor hybrids have attracted attention as photocatalysts for visible-light CO2 reduction, and electron transfer from the metal complex to the semiconductor is critically important to improve the performance. Here rutile TiO2 nanoparticles having 5-10 nm in size were employed as modifiers to improve interfacial charge transfer between semiconducting carbon nitride nanosheets (NS-C3N4) and a supramolecular Ru(II)-Re(I) binuclear complex (RuRe). The RuRe/TiO2/NS-C3N4 hybrid was capable of photocatalyzing CO2 reduction into CO with high selectivity under visible light (lambda > 400 nm), outperforming an analogue without TiO2 by a factor of 4, in terms of both CO formation rate and turnover number (TON). The enhanced photocatalytic activity was attributed primarily to prolonged lifetime of free and/or shallowly trapped electrons generated in TiO2/NS-C3N4 under visible-light irradiation, as revealed by transient absorption spectroscopy. Experimental results also indicated that the TiO2 modifier served as a good adsorption site for RuRe, which resulted in the suppression of undesirable desorption of the complex, thereby contributing to the improved photocatalytic performance. This study presents the first successful example of interfacial manipulation in a metal-complex/semiconductor hybrid photocatalyst for improved visible-light CO2 reduction to produce CO.

DOI： 10.1021/acsami.7b07484

Solar-driven Z-scheme water splitting using tantalum/nitrogen co-doped rutile titania nanorod as an oxygen evolution photocatalyst Reviewed

Akinobu Nakada, Shunta Nishioka, Junie Jhon M. Vequizo, Kanemichi Muraoka, Tomoki Kanazawa, Akira Yamakata, Shunsuke Nozawa, Hiromu Kumagai, Shin-ichi Adachi, Osamu Ishitani, Kazuhiko Maeda

JOURNAL OF MATERIALS CHEMISTRY A 5 ( 23 ) 11710 - 11719 2017.6

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

A visible-light-driven water-splitting system that involves two-step photoexcitation (Z-scheme) was constructed using rutile TiO2 nanorod doped with Ta and N (TiO2:Ta/N) as an O-2 evolution photocatalyst. The Ta-doped TiO2 nanorods, prepared by a solvothermal synthesis, underwent nitridation to possess visible-light absorption under mild conditions, even at 623 K under an ammonia flow. The TiO2: Ta/N powders modified with a RuO2 cocatalyst were active under visible light up to 540 nm for water oxidation for producing O-2 in the presence of reversible electron acceptors (IO3- or Fe3+), while TiO2: N exhibited negligible activity. The results of time-resolved infrared absorption spectroscopy indicated that co-doping Ta with N into TiO2 prolonged the lifetime of photogenerated free electrons, leading to high photocatalytic activity. Simultaneous H-2 and O-2 evolution via water splitting was achieved using a combination of RuO2-modified TiO2: Ta/N, Ru-loaded SrTiO3:Rh and an Fe3+/Fe2+ redox couple under visible-light irradiation (lambda > 420 nm) and under AM 1.5G simulated sunlight.

DOI： 10.1039/c6ta10541f

Trapping-Induced Enhancement of Photocatalytic Activity on Brookite TiO2 Powders: Comparison with Anatase and Rutile TiO2 Powders Reviewed

Junie Jhon M. Vequizo, Hironori Matsunaga, Tatsuya Ishiku, Sunao Karnimura, Teruhisa Ohno, Akira Yamakata

ACS CATALYSIS 7 ( 4 ) 2644 - 2651 2017.4

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Brookite TiO2 is a promising material for active photocatalysts. However, the principal mechanism that determines the distinctive photocatalytic activity between anatase, rutile, and brookite TiO2 has not yet been hilly elucidated. Therefore, in this work, we studied the behavior of photogenerated electrons and holes in these TiO2 powders by using femtosecond to millisecond time-resolved visible to mid-IR absorption spectroscopy. We found that most of the photogenerated electrons in brookite TiO2 are trapped at powder defects within a few ps. This electron trapping decreases the number of surviving free electrons, but it extends the lifetime of holes as well as the trapped electrons because the probability of electrons to encounter holes is decreased by this electron-trapping. As a result, the number of surviving holes increases, which is beneficial for photocatalytic oxidation. In contrast, the reactivity of electrons is decreased to some extent by trapping, but they still remain active for photocatalytic reductions. Electron trapping also takes place on anatase and rutile TiO2 powders, but the trap-depth in anatase is too shallow to extend the lifetime of holes and that of rutile is too deep than the thermal energy (kT) at room temperature for the electron consuming reactions. As a result of the moderate depth of the electron trap in brookite, both electrons and holes are reactive for photocatalytic,reductions and oxidations. These results have clearly demonstrated that the presence of an appropriate depth of the electron trap can effectively contribute to enhance the overall photocatalytic activity.

DOI： 10.1021/acscatal.7b00131

The contrasting effect of the Ta/Nb ratio in (111)-layered B-site deficient hexagonal perovskite Ba5Nb4-xTaxO15 crystals on visible-light-induced photocatalytic water oxidation activity of their oxynitride derivatives Reviewed

Mirabbos Hojamberdiev, Maged F. Bekheet, Ehsan Zahedi, Hajime Wagata, Junie Jhon M. Vequizo, Akira Yamakata, Kunio Yubuta, Aleksander Gurlo, Kazunari Domen, Katsuya Teshima

DALTON TRANSACTIONS 45 ( 31 ) 12559 - 12568 2016.8

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

The effect of the Ta/Nb ratio in the (111)-layered B-site deficient hexagonal perovskite Ba5Nb4-xTaxO15 (0 <= x <= 4) crystals grown by a KCl flux method on visible-light-induced photocatalytic water oxidation activity of their oxynitride derivatives BaNb1-xTaxO2N (0 <= x <= 1) was investigated. The Rietveld refinement of X-ray data revealed that all Ba5Nb4-xTaxO15 samples were well crystallized in the space group P (3) over bar m1 (no. 164). Phase-pure BaNb1-xTaxO2N (0 <= x <= 1) porous structures were obtained by nitridation of the flux-grown oxide crystals at 950 degrees C for 20, 25, 30, 35, and 40 h, respectively. The absorption edge of BaNb1-xTaxO2N (0 <= x <= 1) was slightly shifted from 720 to 690 nm with the increasing Ta/Nb ratio. The O-2 evolution rate gradually progressed and reached the highest value (127.24 mu mol in the first 2 h) with the Ta content up to 50 mol% but decreased at 75 and 100 mol% presumably due to the reduced specific surface area and high density of structural defects, such as grain boundaries acting as recombination centers, originated from high-temperature nitridation for prolonged periods. Transient absorption spectroscopy provided evidence for the effect of the Ta/Nb ratio on the behavior and energy states of photogenerated charge carriers, indicating a direct correlation with photocatalytic water oxidation activity of BaNb1-xTaxO2N.

DOI： 10.1039/c6dt02095j

Photocatalytic property of metal ion added SrTiO3 to Overall H2O splitting Reviewed

Yoshihisa Sakata, Yoshiko Miyoshi, Tatsuya Maeda, Kohki Ishikiriyama, Yuki Yamazaki, Hayao Imamura, Yeilin Ham, Takashi Hisatomi, Jun Kubota, Akira Yamakata, Kazunari Domen

APPLIED CATALYSIS A-GENERAL 521 227 - 232 2016.7

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The effects of the metal ion addition to SrTiO3 to the overall H2O splitting were investigated to improve the photocatalytic activity. The addition of metal ions was carried out by impregnation method. The preparation condition of metal ion added SrTiO3 was examined with applying Na+ ion as additive and SrTiO3 prepared by polymerizable complex method. The photocatalytic activity was markedly improved by the addition of Na+ ion and calcined above 1173 K. The preferable state of the photocatalyst was Na ion (2 atm%) added SrTiO3 obtained by calcination at 1273 K and the photocatalytic activity with a Rh0.3Cr1.7O3 (Rh:0.3 wt%) co-catalyst was 16 mmol/h for H-2 and 8 mmol/h for O-2 production. The apparent quantum yield (AQY) was 16% under the irradiation of 360 nm. The photocatalytic performance of Na+ ion added various SrTiO3 and the effects of various metal ion addition to SrTiO3 to the photocatalytic activity of the overall H2O splitting were investigated to discuss the influence of the added metal ions to the photocatalytic activity. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.apcata.2015.12.013

Enhancement of photoelectrochemical activity of SnS thin-film photoelectrodes using TiO2, Nb2O5, and Ta2O5 metal oxide layers Reviewed

Junie Jhon M. Vequizo, Masanori Yokoyama, Masaya Ichimura, Akira Yamakata

APPLIED PHYSICS EXPRESS 9 ( 6 ) 067101 2016.6

Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD

Tin sulfide (SnS) fine photoelectrodes fabricated by three-step pulsed electrodeposition were active for H-2 evolution. The incident-photon-conversion-efficiency increases from 900 nm and offers a good fit with the absorption spectrum. The activity was enhanced by 3.4, 3.0, and 1.8 times compared to bare SnS by loading Nb2O5, TiO2, and Ta2O5, respectively. Nb2O5 was most efficient because its conduction band is low enough to facilitate effective electron transfer from SnS; it also has sufficiently high potential for H-2 evolution. The overall activity is determined by the competitive interfacial electron transfer between SnS/metal-oxide and metal-oxide/water. Therefore, constructing appropriate heterojunctions is necessary for further improving photoelectrochemical systems. (C) 2016 The Japan Society of Applied Physics

DOI： 10.7567/APEX.9.067101

酸化チタン光触媒のキャリアーダイナミクス－粉末におけるアナターゼとルチルの特異的な挙動－ Reviewed

山方啓

光化学 47 ( 1 ) 25 - 32 2016.4

Dynamics of Photogenerated Charge Carriers on Ni- and Ta-Doped SrTiO3 Photocatalysts Studied by Time-Resolved Absorption and Emission Spectroscopy Reviewed

Akira Yamakata, Masayuki Kawaguchi, Ryosuke Murachi, Masahiro Okawa, Itaru Kamiya

JOURNAL OF PHYSICAL CHEMISTRY C 120 ( 15 ) 7997 - 8004 2016.4

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The behavior of photogenerated charge carriers on SrTiO3 photocatalysts doped with transition metals (such as Ni and Ta) was examined by time-resolved visible to mid-IR absorption and emission spectroscopy. When SrTiO3 was co-doped with Ni and Ta, the catalyst absorbed visible light and exhibited photocatalytic activity undervisible light irradiation. However, activity under UV light was decreased significantly compared to that before doping. The results of time-resolved measurements showed that monodoping of Ni or Ta accelerated the recombination but co-doping Ni with Ta increased the lifetime of charge carriers compared to those without doping. Furthermore, electrons excited by a visible laser pulse had longer lifetimes compared to those excited by a UV laser pulse. Time-resolved photoluminescence measurements suggested that doped Ni cations act as recombination centers, giving a luminescence peak at similar to 8000 cm(-1) due to the downward d-d transition at Ni2+. However, the lifetime of the emission was much shorter than that of free or shallowly trapped electrons. These results suggest that recombination at the Ni cations is not the dominant process. In addition, the reactivity of photogenerated electrons was decreased dramatically by doping; electrons did not react with exposed O-2, although holes maintained reactivity with MeOH. These results confirm that the decrease in the steady-state activity of doped SrTiO3 under UV light irradiation is responsible for the decrease in reactivity of photogenerated electrons.

DOI： 10.1021/acs.jpcc.6b01494

Nature-Inspired, Highly Durable CO2 Reduction System Consisting of a Binuclear Ruthenium(II) Complex and an Organic Semiconductor Using Visible Light Reviewed

Ryo Kuriki, Hironori Matsunaga, Takuya Nakashima, Keisuke Wada, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 138 ( 15 ) 5159 - 5170 2016.4

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

A metal-free organic semiconductor of mesoporous graphitic carbon nitride (C3N4) coupled with a Ru(II) binuclear complex (RuRu') containing photosensitizer and catalytic units selectively reduced CO2 into HCOOH under visible light (lambda > 400 nm) in the presence of a suitable electron donor with high durability, even in aqueous solution. Modification of C3N4 with Ag nano particles resulted in a RuRu'/Ag/C3N4 photocatalyst that exhibited a very high turnover number (>33000 with respect to the amount of RuRu'), while maintaining high selectivity for HCOOH production (87-99%). This turnover number was 30 times greater than that reported previously using C3N4 modified with a mononuclear Ru(II) complex, and by far the highest among the metal-complex/semiconductor hybrid systems reported to date. The results of photocatalytic reactions, emission decay measurements, and time-resolved infrared spectroscopy indicated that Ag nanoparticles on C3N4 milliseconds from the conduction band of C3N4, which were transferred to photocatalytic CO2 reduction driven by two-step photoexcitation of C3N4 and Ag/C3N4 hybrid photocatalyst worked efficiently in water containing a proper nature of C3N4 and low solubility of CO2 in an aqueous environment. collected electrons having lifetimes of several the excited state of RuRu', thereby promoting RuRu'. This study also revealed that the RuRu'/electron donor, despite the intrinsic hydrophobic nature of C3N4 and low solubility of CO2 in an aqueous environment.

DOI： 10.1021/jacs.6b01997

KCl flux-induced growth of isometric crystals of cadmium-containing early transition-metal (Ti4+, Nb5+, and Ta5+) oxides and nitridability to form their (oxy)nitride derivatives under an NH3 atmosphere for water splitting application Reviewed

Mirabbos Hojamberdiev, Hajime Wagata, Kunio Yubuta, Kenta Kawashima, Junie Jhon M. Vequizo, Akira Yamakata, Shuji Oishi, Kazunari Domen, Katsuya Teshima

APPLIED CATALYSIS B-ENVIRONMENTAL 182 626 - 635 2016.3

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

In this study, we have attempted to experimentally validate the results of previous theoretical calculations predicting the possible formation of the CdTiO3-xNy, CdNbO2N, and CdTaO2N phases by applying conventional one- and two-step fabrication methods under an NH3 flow. For the two-step method, CdTiO3, Cd2Nb2O2, and Cd2Ta2O7 crystals were first grown by a KCl flux method, and the effects of solute concentration and cooling rate on the crystal growth were studied. The formability of their (oxy)nitride derivatives was investigated by changing the nitridation temperature (750-950 degrees C) and time (1-10 h) of oxide precursors. It was found that the CdTiO3-xNy, CdNbO2N, and CdTaO2N phases cannot be formed by the applied conventional methods due to the low volatilization temperature of cadmium and the susceptibility of titanium and niobium to reduction under an NH3 atmosphere. Under high-temperature NH3 atmosphere, only Cd2Ta2O2 was fully converted to single-phase Ta3N5. The results from the photocatalytic O-2 evolution test of bare and CoOx-loaded Ta3N5 crystalline structures, converted from Cd2Ta2O2 (Cd-Ta3N5) and Na2CO3-treated Ta2O3 (Na-Ta3N5) and Cd2Ta2O2 (Na-Cd-Ta3N5) crystals by nitridation at 850 degrees C for 20h under an NH3 flow, revealed that the CoOx-loaded Ta3N5 showed more than two times higher O-2 evolution rate (655 mu mol), whereas the CoOx-loaded Cd-Ta3N5 and Na-Cd-Ta3N5 exhibited nearly four (501 mu mol) and three (422 mu mol) times higher O-2 evolution rates at 5 h compared with their bare counterparts. An improved photocatalytic activity for O-2 evolution is related to the higher density of nucleation centers of CoOx nanoparticles in the form of dangling bonds in porous Ta3N5 structures and long-lived photogenerated holes, as attested by time-resolved absorption spectroscopy. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/bj.apcatb.2015.10.002

Transient Absorption and FT-IR Analysis of the Carrier Dynamics of TiO2 Photocatalysts

Vequizo Junie Jhon, Matsunaga Hironori, Okamura Shou, Ohno Teruhisa, Yamakata Akira

表面科学学術講演会要旨集 36 ( 0 ) 217 - 217 2016.1

Language：English Publisher：The Surface Science Society of Japan

The behavior of photocarriers in anatase, rutile, and brookite TiO<sub>2</sub> was studied by using transient absorption and FT-IR spectroscopy. In anatase, free electrons survive > 1 ms. In contrast, most of the electrons in rutile are deeply trapped at the defects. In brookite, some of the electrons are deeply trapped, but some also survive in the conduction band. FT-IR results revealed that the rate of charge accumulation is faster in anatase but slower in rutile and brookite.

DOI： 10.14886/sssj2008.36.0_217

Flux-mediated doping of SrTiO3 photocatalysts for efficient overall water splitting Reviewed

Yeilin Ham, Takashi Hisatomi, Yosuke Goto, Yosuke Moriya, Yoshihisa Sakata, Akira Yamakata, Jun Kubota, Kazunari Domen

JOURNAL OF MATERIALS CHEMISTRY A 4 ( 8 ) 3027 - 3033 2016

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

SrTiO3 is a photocatalyst that is well known for its activity for the overall water splitting reaction under UV light irradiation. In this study, the effects of SrCl2 flux treatments and Al doping on the photocatalytic properties of SrTiO3 were investigated. The SrTiO3, which showed an apparent quantum efficiency of 30% at 360 nm in the overall water splitting reaction, the highest value reported so far, was prepared by SrCl2 flux treatments in alumina crucibles. Scanning electron microscopy and X-ray diffractometry revealed that the flux-treated SrTiO3 consisted of well-crystalline particles with a cubic shape reflecting the perovskite-type structure. Inductively coupled plasma optical emission spectroscopy revealed that Al ions from the alumina crucibles were incorporated into the SrTiO3 samples. The SrTiO3 that was treated with SrCl2 flux in Al-free conditions showed a marginal improvement in photocatalytic activity despite the high crystallinity and the clear crystal habit. Doping SrTiO3 with Al improved the photocatalytic activity even without SrCl2 treatment. These results suggested that Al doping was a principal factor in the dramatic improvement in the water splitting activity of the flux-treated SrTiO3. The effects of flux treatments and Al doping on the morphology and water splitting activity of SrTiO3 were discussed separately.

DOI： 10.1039/c5ta04843e

Femto-second time-resolved absorption study on photocatalysts

Matsunaga Hironori, Vequizo Junie Jhon, Yamakata Akira

Abstract of annual meeting of the Surface Science of Japan 36 218 - 218 2016

Behavior of photogenerated charge carriers on metal-particle loaded photocatalysts studied by time-resolved absorption spectroscopy

Yamakata Akira

Abstract of annual meeting of the Surface Science of Japan 36 216 - 216 2016

Morphology-sensitive trapping states of photogenerated charge carriers on SrTiO3 particles studied by time-resolved visible to Mid-IR absorption spectroscopy: The effects of molten salt flux treatments Reviewed

Akira Yamakata, Ham Yeilin, Masayuki Kawaguchi, Takashi Hisatomi, Jun Kubota, Yoshihisa Sakata, Kazunari Domen

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 313 168 - 175 2015.12

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE SA

The effects of the morphology-change of SrTiO3 particles on the behavior of photogenerated charge carriers are studied by time-resolved absorption (TA) spectroscopy from the visible to mid-IR region. In the case of as-purchased defect-rich commercial SrTiO3 particles, most of the charge carriers are deeply trapped, showing a transient absorption peak at 11,000 cm(-1). Scanning electron microscopy reveals that the irregular-shaped primary particles are heavily aggregated and that the photocatalytic activity for the water splitting reaction is negligibly small. However, when this powder is flux-treated by SrCl2, fine cubic SrTiO3 crystals exposing well-defined surfaces are formed and the photocatalytic activity is greatly improved. TA measurements show that the spectral shape is changed dramatically: the number of deeply trapped electrons is reduced, and that of shallowly trapped electrons producing the absorption band at 2500 cm(-1) is increased. The change in electron trap depth, observed upon flux treatment, is due to the decrease in the number of defects. We also found that further flux treatment in an Al2O3 crucible (i) induces Al doping into SrTiO3, (ii) enhances the photocatalytic activity, (iii) changes the spectral shape, and (iv) prolongs the lifetime of shallowly trapped electrons. The increase in photocatalytic activity is presumably due to the change in lifetime. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jphotochem.2015.05.016

Distinctive Behavior of Photogenerated Electrons and Holes in Anatase and Rutile TiO2 Powders Reviewed

Akira Yamakata, Junie Jhon M. Vequizo, Hironori Matsunaga

JOURNAL OF PHYSICAL CHEMISTRY C 119 ( 43 ) 24538 - 24545 2015.10

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

TiO2 powders have been widely used for photocatalysts; however, why anatase shows higher activity than ruffle has been a long-standing question. Here, we have elucidated the difference in the behavior of photogenerated electrons and holes by time-resolved visible to mid-IR absorption spectroscopy. In anatase TiO2, a considerable number of free electrons survive longer than 1 ms, but they are deeply trapped within a few picoseconds in the case of ruffle TiO2. The longer lifetime of free electrons is responsible for the higher activity for reduction processes on anatase TiO2. However, deep electron trapping in ruffle TiO2 elongates lifetime of holes and promotes multihole processes such as water oxidation. However, the low reactivity of deeply trapped electrons fails to increase the overall activity. These peculiar behaviors of electrons and holes are induced by defects on the powder particles and less sensitive to the physical properties such as particle size and specific surface area.

DOI： 10.1021/acs.jpcc.5b09236

NH3-Assisted Flux Growth of Cube-like BaTaO2N Submicron Crystals in a Completely Ionized Nonaqueous High-Temperature Solution and Their Water Splitting Activity Reviewed

Mirabbos Hojamberdiev, Kunio Yubuta, Junie Jhon M. Vequizo, Akira Yamakata, Shuji Oishi, Kazunari Domen, Katsuya Teshima

CRYSTAL GROWTH & DESIGN 15 ( 9 ) 4663 - 4671 2015.9

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

As the 600 nm-class photocatalyst, BaTaO2N is one of the promising candidates of the perovskite-type oxynitride family for photocatalytic water splitting under visible light. The oxynitrides are routinely synthesized by nitriding corresponding oxide precursors under a high-temperature NH3 atmosphere, causing an increase in the defect density and a decrease in photocatalytic activity. To improve the photo catalytic activity by reducing the defect density and improving the crystallinity, we here demonstrate an NH3-assisted KCl flux growth approach for the direct synthesis of BaTaO2N crystals. The effects of various fluxes, solute concentration, and reaction time and temperature on the phase evolution and morphology transformation of the BaTaO2N crystals were systematically investigated. By changing the solute concentration from 10 to 50 mol %, it was found that phase-pure BaTaO2N crystals could only be grown with the solute concentrations of >= 10 mol % using the KCl flux, and the solute concentration of 10 mol % was solely favorable to directly grow cube-like BaTaO2N crystals with an average size of about 125 nm and exposed {100} and {110} faces at 950 degrees C for 10 h. The time- and temperature-dependent experiments were also performed to postulate the direct growth mechanisms of cube-like BaTaO2N submicron crystals. The BaTaO2N crystals modified with Pt and CoOx nanopartides showed a reasonable H-2 and O-2 evolution, respectively, due to a lower defect density and higher crystallinity achieved by an NH3-assisted KCl flux method.

DOI： 10.1021/acs.cgd.5b00927

NH3-Assisted Flux-Mediated Direct Growth of LaTiO2N Crystallites for Visible-Light-Induced Water Splitting Reviewed

Kenta Kawashirna, Mirabbos Hojamberdiev, Hajirne Wagata, Kunio Yubuta, Junie Jhon M. Vequizo, Akira Yamakata, Shuji Oishi, Kazunari Domen, Katsuya Teshima

JOURNAL OF PHYSICAL CHEMISTRY C 119 ( 28 ) 15896 - 15904 2015.7

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Photocatalytic overall water splitting on (oxy)nitrides under visible light is one of the interesting approaches to fulfill the growing demand for clean and renewable energy. The improvement of the fabrication method is however important for reducing the defect density of (oxy)nitride crystals. The present study aims to investigate the direct growth of the LaTiO2N (LTON) crystallites with less defect density by an NH3-assisted flux method and to demonstrate the visible-light-induced photocatalytic water oxidation activity in relation to their crystallite morphology. Single-phase LaTiO2N crystallites (average size of 120 +/- 39 nm) in round shape with smooth surface and high crystallinity were grown by an NH3-assisted flux method using the KCl flux with the solute concentration of 5 mol % at 950 degrees C for 10 h. The photocatalytic water oxidation activity of bare and CoOx-loaded LaTiO2N crystallites grown directly by an NH3-assisted flux method (1-step-LTON) was evaluated under visible light by comparing with the LaTiO2N crystallites fabricated by a two-step method (2-step-LTON), converting La2Ti2O7 to LaTiO2N by high-temperature nitridation. Within the first 2 h of the photocatalytic water oxidation half-reaction, the O-2 evolution rates of bare and CoOx-loaded 1-step-LTON crystallites were 82 mu mol.h-(1) and 204 mu mol.h(-1), respectively, which are much higher than that of bare and CoOx-loaded 2-step-LTON crystallites (37 mu mol.h(-1) and 177 mu mol.h(-1)) due to less defect density of the LaTiO2N crystallites achieved by a direct fabrication route using KCl flux. An NH3-assisted flux growth is a promising route for the direct fabrication of the LaTiO2N crystallites with less defect density that is beneficial for the enhancement of photocatalytic water oxidation half-reaction.

DOI： 10.1021/acs.jpcc.5b03718

時間分解可視中赤外分光法を用いた光励起キャリアーの反応活性評価

山方啓, 久保田純, 堂免一成

触媒 115 52 - 54 2015.3

Behavior and Energy State of Photogenerated Charge Carriers in Single-Crystalline and Polycrystalline Powder SrTiO3 Studied by Time-Resolved Absorption Spectroscopy in the Visible to Mid-Infrared Region Reviewed

Akira Yamakata, Junie Jhon M. Vequizo, Masayuki Kawaguchi

JOURNAL OF PHYSICAL CHEMISTRY C 119 ( 4 ) 1880 - 1885 2015.1

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The effects of defects on the behavior of photogenerated charge carriers in SrTiO3 (STO) are studied by time-resolved absorption spectroscopy from the visible to mid-IR region. In the case of defect-free single-crystalline STO, free and shallowly trapped electrons are dominant, but they recombine within 50 ns. By contrast, in the case of defect-rich powder STO, the electron lifetime is much longer than 1 ms. The transient absorption spectra show that most of the charge carriers in powder STO are trapped in the defects, which elongates their lifetime. We found that these trapped carriers are nevertheless reactive toward O-2 or CH3OH that depends on the trap depth. The steady-state photocatalytic activity is strongly correlated with the lifetime and the reactivity of the trapped charge carriers: the energy state of electrons can be deduced from the spectral shape, especially in the mid-IR region.

DOI： 10.1021/jp510647b

Surface-enhanced IR absorption spectroscopy of the KcsA potassium channel upon application of an electric field Reviewed

Akira Yamakata, Hirofumi Shimizu, Shigetoshi Oiki

PHYSICAL CHEMISTRY CHEMICAL PHYSICS 17 ( 33 ) 21104 - 21111 2015

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

Surface-enhanced IR absorption spectroscopy (SEIRAS) is a powerful tool for studying the structure of molecules adsorbed on an electrode surface (ATR-SEIRA). Coupled with an electrochemical system, structural changes induced by changes in the electric field can be detected. All the membrane proteins are subjected to the effect of membrane electric field, but conformational changes at different membrane potentials and their functional relevance have not been studied extensively except for channel proteins. In this contribution, background information of potential-dependent functional and structural changes of a prototypical channel, the KcsA channel, is summarized, and SEIRAS applied to the KcsA channel under the application of the potential is shown. The potassium channels allow K+ to permeate selectively through the structural part called the selectivity filter, in which dehydrated K+ ions interact with backbone carbonyls. In the absence of K+, the selectivity filter undergoes conformational changes to the non-conductive collapsed conformation. To apply the electric field, the KcsA channels were fixed on the gold surface in either upside or reverse orientation. The SEIRA spectrum in K+ or Na+ solution revealed both backbone structural changes and local changes in the OCO-carboxylate groups. Upon application of the negative electric field, the spectrum of OCO was enhanced only in the K+ solution. These results indicate that the negative electric field accumulates local K+ concentration, which turned the collapsed filter to the conductive conformation. ATR-SEIRA serves as an unprecedented experimental system for examining membrane proteins under an electric field.

DOI： 10.1039/c5cp02681d

Behavior and Energy States of Photogenerated Charge Carriers on Pt- or CoOx-Loaded LaTiO2N Photocatalysts: Time-Resolved Visible to Mid-Infrared Absorption Study Reviewed

Akira Yamakata, Masayuki Kawaguchi, Naoyuki Nishimura, Tsutomu Minegishi, Jun Kubota, Kazunari Domen

JOURNAL OF PHYSICAL CHEMISTRY C 118 ( 41 ) 23897 - 23906 2014.10

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Femtosecond to second time-resolved visible to mid-infrared absorption spectroscopy was applied to investigate the behavior of photogenerated electrons and holes on a Pt- or CoOx-loaded LaTiO2N photocatalyst. CoOx-loaded catalyst exhibits the highest activity for water oxidation under visible light (<600 nm) excitation, and the quantum efficiency reaches up to 30%. Transient absorption spectra suggest that most of the photoexcited electrons in LaTiO2N lose activity by deep trapping in the mid-gap states created at 0.74 eV (6000 cm1) below the conduction band. In this case, Pt loading was not so effective for H-2 evolution because the loaded Pt could not effectively capture the trapped electrons from LaTiO2N. The electron transfer was slow, proceeding in 0100 mu s, and was thus ineffective. However, in the case of CoOx loading, we have clearly observed, for the first time, that the holes are captured rapidly by CoOx in a few picoseconds, and the lifetimes of electrons are dramatically prolonged to the second region. This implies that the photogenerated holes and electrons are separated effectively in CoOx and LaTiO2N, respectively. Furthermore, the electron trap becomes shallower, its depth decreasing from 0.74 eV (6000 cm1) to 0.49 eV (4000 cm1) upon CoOx loading, suggesting that the reactivity of the trapped electrons increases. These perturbations of electrons and holes are what cause the dramatic increase in photocatalytic activity. We expected that coloading of Pt and CoOx would further increase the activity, but it was significantly reduced. It was demonstrated that the undesirable process of recombination is accelerated under high loading and coloading.

DOI： 10.1021/jp508233z

電極界面におけるイオンの水和殻崩壊過程の時間分解赤外分光観察 Reviewed

山方啓, 大澤雅俊, 森田明弘

Electrochemistry 電気化学および工業物理化学 82 ( 9 ) 771 - 776 2014.9

Behavior of Photogenerated Charge Carriers on Several Photocatalysts Studied by Time-resolved IR Absorption Spectroscopy. Reviewed

天野史章, 山方啓

触媒 56 ( 2 ) 88 - 94 2014.4

Properties of N-H Local Vibration Modes in GaAsN Grown by Chemical Beam Epitaxy

Kazuma Ikeda, Akira Yamakata, Koushiro Demizu, Nobuaki Kojima, Oshio Ohshita, Masafumi Yamaguchi

2014 IEEE 40TH PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) 1821 - 1824 2014

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

The structural and electrical properties of N-H complexes in GaAsN grown by chemical beam epitaxy are summarized. Using local vibration mode spectroscopy, some of the vibration frequencies are shown to be the same as those in the material grown by liquid encapsulated Czochralski and metal organic chemical vapor deposition, while no vibration modes are common to those in the material grown by molecular beam epitaxy. The dependencies of the vibration frequencies on measurement temperatures and annealing temperatures, and polarization of the vibration directions are studied to understand the structural properties of N-H complexes. The As source flow rate affects ratios of the defect densities, which indicate that those defects have different formation processes. The charge excitations by irradiation light indicate that the charge relaxation processes caused by those defects are in the orders of micro seconds.

DOI： 10.1109/PVSC.2014.6925276

Effect of Particle Size on the Photocatalytic Activity of WO3 Particles for Water Oxidation Reviewed

Fumiaki Amano, Eri Ishinaga, Akira Yamakata

JOURNAL OF PHYSICAL CHEMISTRY C 117 ( 44 ) 22584 - 22590 2013.11

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The particle size of a photocatalyst is one of the factors that determine the photon utilization efficiency. Here, we report the effects of the particle size on the photocatalytic activity of tungsten trioxide (WO3) for water oxidation to evolve molecular oxygen in the presence of sacrificial silver nitrate. For the water oxidation, the photocatalytic activity of large aggregates consisting of particles with a small specific surface area (3 m(2) g(-1)) was greater than that of fine particles with a larger specific surface area (11 m(2) g(-1)). Transient infrared absorption spectra revealed that the recombination of photoexcited electrons in the large particles was slower than that in the fine particles. It was found that the fast recombination in the fine particles mostly occurred on the surface. The photocatalytic activity for water oxidation increased with increasing particle size for spherical diameters smaller than 200 nm. These results showed that large particles with a low surface area-to-volume ratio were suitable for photocatalytic oxygen evolution, which requires long-lived holes, because the surface recombination of photogenerated electrons and holes occurred less frequently.

DOI： 10.1021/jp408446u

Real-Time Observation of the Destruction of Hydration Shells Reviewed

Akira Yamakata, Eiji Soeta, Tatsuya Ishiyama, Masatoshi Osawa, Akihiro Morita

J. Am. Chem. Soc. 135 ( 40 ) 977 - 988 2013.10

Real-Time Observation of the Destruction of Hydration Shells under Electrochemical Force Reviewed

Akira Yamakata, Eiji Soeta, Tatsuya Ishiyama, Masatoshi Osawa, Akihiro Morita

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 135 ( 40 ) 15033 - 15039 2013.10

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Major alteration or even destruction of the hydration shell around interacting molecules and ions in solution is an important process that determines how hydrated substances interact. Therefore, the direct observation of structural changes in hydration shells around solutes in close contact with other solutes or surfaces is important for understanding chemical processes that take place in solution. In the work described in this paper, time-resolved IR absorption measurements were performed to study the interaction of hydrated Na+ or tetrapropylammonium cation (Pr4N+) with a hydrophobic CO-covered Pt surface; the adsorption force between cations and the surface was controlled by using an electrochemical system. We found that the hydrophobic hydration shell of Pr4N+ is initially stabilized on the hydrophobic surface, but application of a strong force to the cation approaching CO destroys the water layers between them. This process is rather slow, taking a few hundred milliseconds. Hydrophilic Na+ behaves quite differently from Pr4N+ due to the different structure of its hydration shell. These experimental results are supported by molecular dynamics simulations.

DOI： 10.1021/ja408326d

Photocatalytic activity of titania particles calcined at high temperature: Investigating deactivation Reviewed

Fumiaki Amano, Masashi Nakata, Kenji Asami, Akira Yamakata

Chemical Physics Letters 579 111 - 113 2013.7

Language：English Publishing type：Research paper (scientific journal)

We examined the effect of high temperature calcination on the photocatalytic activity and photoexcited electron behavior of rutile TiO 2 with a small specific surface area. Photocatalytic activity for H2 evolution was significantly decreased by calcination at temperatures higher than 500 C, although the specific surface area showed little change. This deactivation was attributed to fast charge carrier recombination. Samples deactivated by high temperature calcination were reduced by hydrogen at 500 or 700 C, increasing both the density of long-lived charge carriers and photocatalytic activity. These results suggest that density of oxygen vacancies is an important factor for photocatalytic reactivity. © 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.cplett.2013.06.038

Structural changes of the KcsA potassium channel upon application of the electrode potential studied by surface-enhanced IR absorption spectroscopy Reviewed

Akira Yamakata, Hirofumi Shimizu, Masatoshi Osawa, Shigetoshi Oiki

CHEMICAL PHYSICS 419 224 - 228 2013.6

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Structural changes of the KcsA potassium channel fixed on gold electrode surface in the upright orientation were studied by surface-enhanced IR absorption spectroscopy (SEIRAS). Measurements were performed at neutral pH, where the activation gate is kept closed. Band intensities were enhanced for the asymmetric (1565 cm(-1)) and symmetric (1405 cm(-1)) OCO-carboxylate groups at negative electrode potentials in the K+ solution, but not in the Na+ solution. Even for the reverse-oriented channel, the enhanced OCO-carboxylate band was evident at negative potential. When TBA was loaded in the central cavity, the K+-specific OCO band was not elicited. These results indicate that the negative electrode potential renders the local K+ concentration accumulated at the vicinity of the electrode surface, and the KcsA channel bathed in high K+ changes conformation of the selectivity filter from the collapsed to the open, and OCO-carboxylate groups (D80 and E71) in the back of the filter were rearranged. Crown Copyright (C) 2013 Published by Elsevier B. V. All rights reserved.

DOI： 10.1016/j.chemphys.2013.02.035

Electronically cross-linked PbS quantum dot networks using polymers as surface ligands Reviewed

Wei Lü, Yue Yang, Akira Yamakata, Itaru Kamiya

Nano 8 ( 2 ) 1350013.1-1350013.7 2013.4

Language：English Publishing type：Research paper (scientific journal)

Bilayer structures of colloidal PbS quantum dots (QDs) with different sizes are fabricated by two methods: chemical bond anchoring and electrostatic adsorption. Unlike the sample prepared by chemical bond anchoring, we find that the electronic connection between different layers is suppressed in the samples prepared by electrostatic adsorption with charged polyelectrolytes. To clarify the electronic coupling between the QDs and the polyelectrolytes, QDs directly stabilized by charged polyelectrolytes were synthesized. Transmission electron microscopy investigation shows that cross-linked QD networks are formed. Time-resolved photoluminescence measurements indicate that the carrier lifetimes of QDs in networks were greatly reduced. The photoluminescence peak energy increases with a third root of the excitation power. All these observations can be consistently explained considering spatially separated photoexcited carriers in a type-II band alignment. The abnormal behaviors of electrostatic adsorption sample are discussed based on these results. © 2013 World Scientific Publishing Company.

DOI： 10.1142/S1793292013500136

Cobalt-Modified Porous Single-Crystalline LaTiO2N for Highly Efficient Water Oxidation under Visible Light Reviewed

Fuxiang Zhang, Akira Yamakata, Kazuhiko Maeda, Yosuke Moriya, Tsuyoshi Takata, Jun Kubota, Katsuya Teshima, Shuji Oishi, Kazunari Domen

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 134 ( 20 ) 8348 - 8351 2012.5

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Highly efficient water oxidation utilizing visible photons of up to 600 nm is a crucial step in artifical photosynthesis. Here we present a highly active photocatalyst for visible-light-driven water oxidation, consisting of single-crystalline meso- and macroporous LaTiO2N (LTON) with a band gap of 2.1 eV, and earth-abundasnt cobalt oxide (CoOx) as a cocatalyst. The optimized CoOx/LTON had a high quantum efficiency of 27.1 +/- 2.6% at 440 nm, which substantially exceeds the values reported for previous particulate photocatalysts with a 600-nm absorption edge.

DOI： 10.1021/ja301726c

Infrared Spectroscopic Study of the Potential Change at Cocatalyst Particles on Oxynitride Photocatalysts for Water Splitting by Visible Light Irradiation Reviewed

Xuwang Lu, Athula Bandara, Masao Katayama, Akira Yamakata, Jun Kubota, Kazunari Domen

JOURNAL OF PHYSICAL CHEMISTRY C 115 ( 48 ) 23902 - 23907 2011.12

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Visible light-induced changes in Pt/(Ga1-xZnx)(Ni1-xOx), Pt/TaON, and Pt/LaTiO2N powder photocatalysts were investigated using infrared spectroscopy with adsorbed CO probe molecules on Pt cocatalysts. Among these photocatalyst materials, only the (Ga1-xZnx)(N1-xOx) photocatalyst has achieved overall water splitting with visible-light irradiation, although all of these materials have suitable band gaps for the reaction. For Pt/(Ga1-xZnx)(N1-xOx) and Pt/TaON, the C-O stretching vibrations of adsorbed CO on Pt shifted to a lower frequency under visible light irradiation. However, no frequency shift was observed for Pt/LaTiO2N. This lower-frequency shift indicates a negative electronic potential shift of the Pt cocatalysts, which results in hydrogen evolution. Differences in the light intensity dependence of the potential shifts of these photocatalysts were observed, and the involvement of a different recombination mechanism of photoexcited carriers in these photocatalysts will be discussed. These results clarify some of the reasons for the activities of various photocatalytic materials for overall water splitting.

DOI： 10.1021/jp207484q

Effect of Photoexcited Electron Dynamics on Photocatalytic Efficiency of Bismuth Tungstate Reviewed

Fumiaki Amano, Akira Yamakata, Kohei Nogami, Masatoshi Osawa, Bunsho Ohtani

JOURNAL OF PHYSICAL CHEMISTRY C 115 ( 33 ) 16598 - 16605 2011.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Photoexcited carrier dynamics of bismuth tungstate (Bi(2)WO(6)) photocatalysts was investigated by time-resolved infrared (IR) absorption spectroscopy. Monotonic absorption at the mid-IR region, which is attributable to absorption by photoexcited electrons, was monitored as a function of time delay from the microsecond to millisecond range after photoexcitation. Bi(2)WO(6) particles with different crystalline content were prepared by hydrothermal reaction at several temperatures and used to elucidate the relation between density of photoexcited carriers and steady-state photocatalytic efficiency. Photocatalytic efficiency was tested using two reactions: oxidative decomposition of acetic acid in an aqueous solution (reaction 1) and oxidative decomposition of acetaldehyde in air (reaction 2). Crystallization of Bi(2)WO(6) particles suppressed the fast recombination of photoexcited electrons and holes within 1 its. In the case of crystallized particles, the density of the photoexcited electron increased with an increase in the crystalline content, and the photocatalytic efficiency for reaction 1 strongly depended on the crystalline content, indicating that photoexcited electrons remaining in the submillisecond time range significantly affect the reaction rate. On the other hand, photocatalytic efficiency for reaction 2 showed a proportional relation with specific surface area rather than crystalline content. The difference in a decisive factor depending on reaction condition is considered to be the slower rate of reaction of photoexcited electrons with molecular oxygen, which might occur within a time range between 200 mu s and 3 ms over Bi(2)WO(6).

DOI： 10.1021/jp2051257

Potential-Dependent Recombination Kinetics of Photogenerated Electrons in n- and p-Type GaN Photoelectrodes Studied by Time-Resolved IR Absorption Spectroscopy Reviewed

Akira Yamakata, Masaaki Yoshida, Jun Kubota, Masatoshi Osawa, Kazunari Domen

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 133 ( 29 ) 11351 - 11357 2011.7

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Recombination kinetics of photogenerated electrons in n-type and p-type GaN photoelectrodes active for H-2 and O-2 evolution, respectively, from water was examined by time-resolved IR absorption (TR-IR) spectroscopy. Illumination of a GaN film with UV pulse (355 nm and 6 ns in duration) gives transient interference spectra in both transmittance and reflection modes. Simulation shows that the interference spectra are caused by photogenerated electrons. We observed that recombination in the microsecond region is greatly affected by the applied potentials, the lifetime becoming longer at negative and positive potentials for n- and p-type GaN electrodes, respectively. There is a good correlation between potential dependence of the steady-state reaction efficiency and that of the number of surviving electrons in the millisecond region. We also performed potential jump measurement to examine the shift in Fermi level by photogenerated charge carriers. In the case of n-type GaN, the electrode potential jumps to the negative side by accumulation of electrons in the bulk. However, in the case of p-type GaN, the electrode potential first jumps to the negative side within 20,us and gradually shifts to the positive side in a few milliseconds, while the number of charge carriers is constant at >0.2 ms. This two-step process is ascribed to electron transport from the bulk to the surface of GaN, because the electrode potential is sensitive to the number of electrons in the bulk. The results confirm that TR-IR combined with potential jump measurement provides useful information for understanding the behavior of charge carriers in photo electrochemical systems.

DOI： 10.1021/ja203639q

Quantum Dots and Wells for Novel Light-Energy Conversions

YAMAKATA Akira

触媒 53 ( 3 ) 201 - 201 2011.4

Structure and Behavior of Water at the Electrochemical Interface Studied by Surface-Enhanced Infrared Absorption Spectroscopy Reviewed

Masatshi Osawa, Akira Yamakata

BUNSEKI KAGAKU 60 ( 1 ) 1 - 9 2011.1

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：JAPAN SOC ANALYTICAL CHEMISTRY

How do water molecules behave at the electrochemical interface (the charged electrode-electrolyte interface)? This is one of the most fundamental and important questions in electrochemistry, and has been discussed extensively since the first proposal of the electric double layer model by Helmholtz in 1853. In the 1960s, a general consensus was reached that water molecules orient along the electric field at the interface and change the orientation depending on the applied potential (i.e., surface charge). However, details had long been unclear. Recent developments of computational theoretical chemistry and in situ surface analytical techniques have enabled a further detailed study of the interface at a molecular level and renewed our understanding. Recent progresses has been reviewed in the manuscript by focusing on experimental data provided by surface-enhanced infrared absorption spectroscopy (SEIRAS).

DOI： 10.2116/bunsekikagaku.60.1

Destruction of the Water Layer on a Hydrophobic Surface Induced by the Forced Approach of Hydrophilic and Hydrophobic Cations Reviewed

Akira Yamakata, Masatoshi Osawa

JOURNAL OF PHYSICAL CHEMISTRY LETTERS 1 ( 9 ) 1487 - 1491 2010.5

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Structural change of the water layers is the primary step for the direct interactions among the hydrated substances in aqueous solutions. We have studied how the water layers on a solid surface is destroyed by the approach of several hydrophilic and hydrophobic cations, which are used as model substances. The combined use of electrochemical system and IR spectroscopy enables the study of the destruction process of water layers during the close contact among them. We have observed for the first time that hydrophilic cations cause greater destruction of the interfacial water structure than hydrophobic cations. This result is ascribed to the different orientations of water molecules around the cations; H-bonds around hydrophilic cations expand toward the outer hydration shells, while they are closed inside the primary shell in the case of hydrophobic cations. These different orientations of water molecules cause different effects on the interfacial water structures.

DOI： 10.1021/jz100424e

Correlation between Photoexcited Electron Lifetimes and Photocatalytic Activities of Bismuth Tungstate Particles Reviewed

AMANO Fumiaki, YAMAKATA Akira, NOGAMI Kohei, OSAWA Masatoshi, OHTANI Bunsho

触媒 52 ( 2 ) 128 - 130 2010.3

Dynamics of photogenerated charge carriers on photocatalysts for the water splitting reaction : relation between the carrier dynamics and the steady state reactions Reviewed

YAMAKATA Akira

分光研究 = Journal of the spectroscopical research of Japan 59 ( 1 ) 12 - 19 2010.2

ATR-SEIRAS Investigation of the Fermi Level of Pt Cocatalyst on a GaN Photocatalyst for Hydrogen Evolution under Irradiation Reviewed

Masaaki Yoshida, Akira Yamakata, Kazuhiro Takanabe, Jun Kubota, Masatoshi Osawa, Kazunari Domen

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 131 ( 37 ) 13218 - 13219 2009.9

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The interaction of photogenerated carries in GaN photocatalyst with Pt cocatalyst for hydrogen evolution under irradiation was investigated from in situ ATR-SEIRAS measurement by following the CO vibrational frequency. After irradiation, the CO frequency shifted higher, indicating that the Fermi Level of Pt particles was positively shifted by the photogenerated holes. Thereafter, a Lower frequency peak appeared, indicating that the Fermi level of some Pt particles was negatively shifted to the hydrogen evolution potential by photogenerated electrons, which is the essential function of cocatalysis for hydrogen evolution.

DOI： 10.1021/ja904991p

Photoexcited processes on metal surfaces : from gas/solid toward liquid/solid interfaces Reviewed

YAMAKATA Akira, OSAWA Masatoshi

Photochemistry 40 ( 2 ) 78 - 84 2009.8

Destruction of the hydration shell around tetraaolkylammonium ions at the electrochemical interface Reviewed

Akira Yamakata, Masatoshi Osawa

Journal of the American Chemical Society 131 ( 20 ) 6892 - 6893 2009.5

Language：English Publishing type：Research paper (scientific journal)

The structure and behavior of the hydration shells around tetraethyl-, -propyl-, and -butylammonium ions (Et4N+, Pr4N+, and Bu4N+, respectively) at a CO-covered Pt electrode was studied by surface-enhanced IR absorption spectroscopy. Selective concentration of cations at the electrochemical interface by controlling the applied potential facilitates the observation of the hydration shells without interference from hydrated anions. We report for the first time that the hydration shells around Pr4N+ and Bu4N+ are decomposed at sufficiently negative potentials because of the strong electrostatic attraction with the surface. On the other hand, the hydration shell around Et4N+, the smallest ion, is more stable and does not decompose in the potential range examined. The difference in the stability can be ascribed to the difference in the size of the central cation. On the other hand, the hydration shells are easily deconstructed on a bare Pt surface because of the stronger interaction with the surface. Copyright © 2009 American Chemical Society.

DOI： 10.1021/ja8100374

Acceleration of electrolysis of water by the adsorption of 4, 4'-bipyridine on Ag electrode : creation of reaction center by organic molecules Reviewed

UCHIDA Taro, YAMAKATA Akira, SASAKI Youichi, OSAWA Masatoshi

觸媒 = Catalyst 51 ( 2 ) 129 - 131 2009.3

Electrocatalytic Reactions Studied by Time-resolved Surface-enhanced Infrared Spectroscopy Reviewed

SAMJESKE Gabor, YAMAKATA Akira, UCHIDA Taro, OSAWA Masatoshi

Journal of the Surface Science Society of Japan 30 ( 2 ) 68 - 74 2009.2

Visible Light Responsive Pristine Metal Oxide Photocatalyst: Enhancement of Activity by Crystallization under Hydrothermal Treatment Reviewed

Fumiaki Amano, Akira Yamakata, Kohei Nogami, Masatoshi Osawa, Bunsho Ohtani

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 130 ( 52 ) 17650 - + 2008.12

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Photocatalytic activities of amorphous and crystal bismuth tungstate (Bi(2)WO(6))were investigated using oxidative decomposition of gaseous acetaldehyde under visible light irradiation (>400 nm). Here, for the first time, negligible photocatalytic activity of amorphous Bi(2)WO(6) owing to the fast recombination of electron-hole pairs and the high quantum efficiency of Bi(2)WO(6) crystallites under visible light were demonstrated by action spectrum analysis and time-resolved infrared absorption measurements. Crystallization of the amorphous phase provided a red shift of the photoabsorption edge and marked increase in the lifetime of photoexcited electrons, resulting in an increase of photocatalytic activity.

DOI： 10.1021/ja807438z

Dynamics of the Electric Double Layer of CO-covered Pt Electrode Reviewed

YAMAKATA Akira, OSAWA Masatoshi

J. Surf. Sci. Soc. Jpn. 29 ( 9 ) 526 - 531 2008.9

Language：Japanese Publisher：The Surface Science Society of Japan

The dynamics of the water molecules on a CO-covered Pt electrode has been studied by laser-induced potential transient measurements. This is a model system to elucidate the behavior of water molecules in the electric double layer during electrochemical reactions. At the potentials where CO is stably adsorbed, the Pt surface is negatively charged and water molecules are oriented pointing the hydrogen atoms toward the surface. The laser irradiation heats the interface and disturbs the orientation of water, which induces a potential jump toward the negative direction. We found that the amplitude of the potential jump on the CO-covered surface is much larger than on the CO-free surface. The finding suggests that the water molecules are more flexible on the CO-covered surface due to the weaker water-CO interaction than water-Pt interaction. Stronger laser pulse irradiation additionally induces the desorption of CO, which result in the adsorption of water with the hydrogen atom pointing toward the surface and induces a positive potential shift. The potential shift takes ∼70 microseconds to reach the maximum, which becomes slower as the electric field becomes intense. The intense field and hydrogen-bonded cations affect water structure in a long range and the collective motion of the water layers.

DOI： 10.1380/jsssj.29.526

Hydrogen evolution reaction catalyzed by proton-coupled redox cycle of 4,4 '-bipyridine monolayer adsorbed on silver electrodes Reviewed

Taro Uchida, Hirokazu Mogami, Akira Yamakata, Yoichi Sasaki, Masatoshi Osawa

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 130 ( 33 ) 10862 - + 2008.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The proton-coupled redox cycle of 4,4'-bipyridine monolayer adsorbed on an Ag electrode catalytically enhances hydrogen evolution reactions in basic and neutral solutions. The specific adsorption via one Wend facilitates electrochemical formation of an unstable N,N-dihydro bipyridine and its decomposition yields H(2).

DOI： 10.1021/ja803446s

Dynamics of double-layer restructuring on a platinum electrode covered by CO: Laser-induced potential transient measurement Reviewed

Akira Yamakata, Masatoshi Osawa

JOURNAL OF PHYSICAL CHEMISTRY C 112 ( 30 ) 11427 - 11432 2008.7

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The dynamic behavior of water molecules on CO-covered Pt electrode has been studied by laser induced temperature jump method. A 532-nm laser pulse quickly heats up the interface (Delta T approximate to 90 K) and perturbs the orientation of water, which results in a negative jump of the rest potential. The potential is relaxed with cooling the substrate (similar to 20 mu s). This behavior is identical to that on the CO-free surface, but the amplitude of the negative jump is more than 30 times larger on the CO-covered surface. This large difference can be ascribed to the differences in the electric field at the interface and also in the interactions of water-Pt and water-CO; water is more flexible on CO. At high laser power densities exceed a threshold, the negative potential jump is followed by a slightly slower (similar to 70 mu s) irreversible potential shift toward the positive direction. Infrared reflection absorption spectroscopy and picosecond two-pulse correlation experiments reveal that the subsequent positive shift arises from thermally activated desorption of CO. Adsorption of water and restructuring of the electric double layer after CO desorption is responsible to the positive shift. The rate of restructuring becomes slower as the initial potential becomes lower due to the increase in the electric field and the number of hydrated cations. The intense field and the hydrogen-bonding affect water structure in a long-range and enhance the collective motion of the water layers.

DOI： 10.1021/jp8018149

Surface-enhanced infrared absorption spectroscopic studies of adsorbed nitrate, nitric oxide, and related compounds 1: Reduction of adsorbed NO on a platinum electrode Reviewed

Kou Nakata, Akinori Okubo, Katsuaki Shimazu, Akira Yamakata, Shen Ye, Masatoshl Osawa

LANGMUIR 24 ( 8 ) 4352 - 4357 2008.4

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Surface-enhanced infrared absorption spectroscopy (SEIRA) was used to examine the adsorption state of nitrogen monoxide (nitric oxide, NO) and the reduction of the adsorbed species. The SEIRA spectra gave two distinct bands at 1723-1733 and 1575-1607 cm(-1) with an additional weak band at 1656-1676 cm(-1) at 0.20 V, the frequencies of which are slightly dependent on the surface coverage. The former two bands are attributed to the on-top and bridged NO, respectively. While the on-top NO stably remained on the surface in the potential range of 0.05-0.60 V, the bridged NO decreased in its intensity with increasing electrode potential. The reduction of the adsorbed NO obeys first-order kinetics with respect to the adsorbed NO. The rate constants are 2.24 +/- 0.03 and 0.24 +/- 0.09 s(-1) at -0.10 V for the on-top and bridged NO, respectively. Tafel slopes obtained from the potential dependence of the rate constant indicate that the rate-determining step is the first electron-transfer process.

DOI： 10.1021/la703394z

Surface-enhanced infrared absorption spectroscopic studies of adsorbed nitrate, nitric oxide, and related compounds 2: Nitrate ion adsorption at a platinum electrode Reviewed

Kou Nakata, Yota Kayama, Katsuaki Shimazu, Akira Yamakata, Shen Ye, Masatoshi Osawa

LANGMUIR 24 ( 8 ) 4358 - 4363 2008.4

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The adsorbed species formed from the nitrate ion were examined using surface-enhanced infrared absorption spectroscopy (SEIRAS). The main band was observed at 1547-1568cm(-1) at 0.2 V in 0.01 M NaNO3 + 0.1 MHClO4. Although this band is close to that assigned to the adsorbed NO in the literature, it is assigned to the N=O stretching vibration of the chelating bidentate form of nitrate for the following reasons. (i) Nitrate gives a single band, while NO has three bands independent of the coverage. (ii) The band intensity remained constant in the potential range from 0.1 to 0.6 V. while that of the bridged NO at around 1600 cm(-1) decreased in this range. (iii) The rate constants for the reduction and/or desorption at negative potentials are about 3 times higher than those of the bridged NO. (iv) The adsorbed species from nitrate is replaced with CO more easily than the bridged NO.

DOI： 10.1021/la703476m

Structure of water at the electrified platinum-water interface: A study by surface-enhanced infrared absorption spectroscopy Reviewed

Masatoshi Osawa, Minoru Tsushima, Hirokazu Mogami, Gabor Samjeske, Akira Yamakata

JOURNAL OF PHYSICAL CHEMISTRY C 112 ( 11 ) 4248 - 4256 2008.3

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Surface-enhanced infrared absorption spectroscopy in the attenuated total reflection mode is used to examine the structure of water on a polycrystalline Pt electrode in H2SO4 and HClO4 as a function of applied potential. The electrode surface covered with CO is used as the reference in recording spectra, which enables us to obtain the absolute infrared spectrum of the interfacial water layer (monolayer or bilayer) in contact with the surface with negligible interference from the bulk water. The spectrum of the interfacial water is largely different from that of bulk water and changes around the potential of zero charge of the electrode. The spectral changes are ascribed to the potential-dependent reorientation of water molecules from a weakly hydrogen-bonded oxygen-up orientation at the negatively charged surface to a strongly hydrogen-bonded nearly flat orientation at the positively charged surface in agreement with theoretical simulations reported in the literature. Clear experimental evidence of the formation of a stable ice-like structured water on the positively charged surface is reported.

DOI： 10.1021/jp710386g

表面増強赤外吸収分光法による電極界面の超高速ダイナミクスの追跡 Reviewed

山方啓, 大澤雅俊

Electrochemistry 電気化学および工業物理化学 : denki kagaku 76 ( 3 ) 208 - 213 2008.3

固液界面の水分子の構造とエネルギー移動ダイナミクス Reviewed

山方啓

分光研究 57 ( 1 ) 23 - 24 2008

Time-resolved infrared absorption study of nine TiO2 photocatalysts Reviewed

Akira Yamakata, Taka-aki Ishibashi, Hiroshi Onishi

CHEMICAL PHYSICS 339 ( 1-3 ) 133 - 137 2007.10

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Electron kinetics of nine TiO2 catalysts were compared in a microsecond time domain. Each catalyst was band-gap excited with an UV light pulse, and electron-induced absorption of mid infrared light was observed as a function of time delay. The probability of electron-hole recombination in the bulk, electron attachment to adsorbed oxygen, and hole attachment to adsorbed methoxy species was estimated. (C) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.chemphys.2007.05.010

How the Molecules Reach the Reaction Center? Reviewed

YAMAKATA AKIRA

触媒 = Catalysts & Catalysis 48 ( 8 ) 611 - 611 2006.12

Laser-induced potential jump at the electrochemical interface probed by picosecond time-resolved surface-enhanced infrared absorption spectroscopy Reviewed

A Yamakata, T Uchida, J Kubota, M Osawa

JOURNAL OF PHYSICAL CHEMISTRY B 110 ( 13 ) 6423 - 6427 2006.4

Language：English Publisher：AMER CHEMICAL SOC

Picosecond time-resolved surface-enhanced infrared absorption spectroscopy (SEIRAS) has been used for the first time to examine the potential jump at the electrochemical interface induced by a visible pulse irradiation. The potential dependent shift of the C-O stretching vibration of CO adsorbed on a Pt electrode was utilized to monitor the potential jump. A 6-cm(-1) red-shift was observed with a time delay of similar to 200 ps with respect to a visible pump-pulse irradiation (532 nm, 35 ps duration, 3 mJ cm(-2)). The observed red-shift is ascribed to the heating of the in-plane frustrated translational mode of CO and the negative shift of potential. These two contributions can be separated with the aid of the transient of the background reflectivity of the electrode surface. The heating of water layers near the surface is mainly responsible for the potential jump through the orientation change of water molecules. This method is promising as a tool to examine ultrafast electrode dynamics.

DOI： 10.1021/jp060387d

Adsorbed structures of 4,4 '-bipyridine on Cu(111) in acid studied by STM and IR Reviewed

YX Diao, MJ Han, LJ Wan, K Itaya, T Uchida, H Miyake, A Yamakata, M Osawa

LANGMUIR 22 ( 8 ) 3640 - 3646 2006.4

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The adsorption of 4,4'-bipyridine (BiPy) on Cu(111) has been investigated in 0.1 M HClO4 by cyclic voltammetry, electrochemical scanning tunneling microscopy (STM), and surface-enhanced infrared adsorption spectroscopy (SEIRAS). Cyclic voltammetry showed the double layer region extending from -0.2 to 0.26 V and a pair of redox waves superposing on hydrogen evolution wave at more negative potentials. Diprotonated BiPy, BiPyH22+, is adsorbed flat on the Cu(111) (1 x 1) surface and forms a well-ordered monolayer with a (3 x 4) symmetry in the double-layer potential region. At more negative potential, BiPyH22+ is reduced to its monocation radical, BiPyH2 center dot+, and forms another well-ordered structure in which the radicals are stacked in molecular rows with a face-to-face self-dimer as the building unit. The SEIRA spectra of both BiPyH22+ and BiPyH2 center dot+ are dominated by gerade modes which should be IR-inactive for the centrosymmetric species. The breakdown of the selection rule of IR absorption is ascribed to the vibronic coupling associated with charge transfer between BiPyH22+ and the surface and between the radicals.

DOI： 10.1021/la052765w

Study on photogenerated charge carriers dynamics in sulfur-doped titanium dioxide by transient IR absorption Reviewed

Kan Takeshita, Akira Yamakata, Taka-aki Ishibashi, Hiroshi Onishi, Kazumoto Nishijima, Teruhisa Ohno

J. photochem. Photobiol. B. Chemistry 117 269 - 275 2006.4

Transient IR absorption study of charge carriers photogenerated in sulfur-doped TiO2 Reviewed

K Takeshita, A Yamakata, T Ishibashi, H Onishi, K Nishijima, T Ohno

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 177 ( 2-3 ) 269 - 275 2006.1

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE SA

Sulfur-doped TiO2 was prepared by two methods; one was simple oxidation annealing of TiS2, the other was mixing of titanium isopropoxide and thiourea. These two sulfur-doped TiO2, preparations showed fairly different photocatalytic activity under visible light. The dynamics of photogenerated charge carriers were studied by the transient absorption measurement in the region of mid-IR. In both samples, excitation by 532 nm pulse led to photocarrier generation to the same extent. Nevertheless, the reactivity of the photocarriers was totally different. Photogenerated electrons and holes transferred to reactant gas in the latter sample, whereas they did not in the former sample. We attributed the different carrier behavior to the difference in the distribution of S atoms or particle size. These observations can explain the difference in capability of photocatalysis under visible light. (c) 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jphotochem.2005.06.006

Potential oscillations in galvanostatic electrooxidation of formic acid on platinum: A time-resolved surface-enhanced infrared study Reviewed

G Samjeske, A Miki, S Ye, A Yamakata, Y Mukouyama, H Okamoto, M Osawa

JOURNAL OF PHYSICAL CHEMISTRY B 109 ( 49 ) 23509 - 23516 2005.12

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The mechanism of temporal potential oscillations that occur during galvanostatic formic acid oxidation on a Pt electrode has been investigated by time-resolved surface-enhanced infrared absorption spectroscopy (SEIRAS). Carbon monoxide (CO) and formate were found to adsorb on the surface and change their coverages synchronously with the temporal potential oscillations. Isotopic solution exchange (from (HCOOH)-C-13 to (HCOOH)-C-12) and potential step experiments revealed that the oxidation of formic acid proceeds dominantly through adsorbed formate and the decomposition of formate to CO2 is the rate-determining step of the reaction. Adsorbed CO blocks the adsorption of formate and also suppresses the decomposition of formate to CO2, which raises the potential to maintain the applied current. The oxidative removal of CO at a high limiting potential increases the coverage of formate and accelerates the decomposition of formate, resulting in a potential drop and leading to the formation of CO. This cycle repeats itself to give the sustained temporal potential oscillations. The oscillatory dynamics can be explained by using a nonlinear rate equation originally proposed to explain the decomposition of formate and acetate on transition metal surfaces in UHV.

DOI： 10.1021/jp055220j

Time-Resolved IR Absorption Study on Solid Surfaces Reviewed

YAMAKATA AKIRA, OSAWA MASATOSHI

触媒 = Catalysts & Catalysis 47 ( 5 ) 334 - 340 2005.8

Time-resolved infrared absorption study of photochemical reactions over metal oxides Reviewed

A Yamakata, T Ishibashi, K Takeshita, H Onishi

TOPICS IN CATALYSIS 35 ( 3-4 ) 211 - 216 2005.7

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER/PLENUM PUBLISHERS

The present account describes how photochemical reactions over metal oxides are traced by time-resolved infrared (IR) absorption spectroscopy. The ac-coupled amplification of the IR signal allows detection of transient absorbance changes as small as 10(-6) with a time resolution of 50 ns. Band-gap excited electrons in TiO2 and NaTaO3 present a structureless absorption of IR light from 3000 to 1000 cm(-1). Reaction-perturbed decay of this absorption evidences the assignment to photoexcited electrons, not to holes. The efficiency of the water splitting reaction on NaTaO3-based catalysts correlates with the quantity of electrons detected by the IR absorption. A short-lived intermediate state of 2-propanol oxidation on TiO2 is identified by its vibrational band at 1640 cm(-1) superposed on the structureless absorption of electrons. Ru dye (N3) on a TiO2 film is irradiated with a 532-nm light pulse to simulate dye-sensitized solar cells. The neutralization rate of dye cations and the decay rate of electrons injected in the film are quantified, leading to a three-state model which describes the relaxation of injected electrons. These results demonstrate the ability of this method in tracing photochemical kinetics over metal oxides.

DOI： 10.1007/s11244-005-3826-0

Carrier dynamics in TiO2 and Pt/TiO2 powders observed by femtosecond time-resolved near-infrared spectroscopy at a spectral region of 0.9-1.5 mu m with the direct absorption method Reviewed

K Iwata, T Takaya, H Hamaguchi, A Yamakata, TA Ishibashi, H Onishi, H Kuroda

JOURNAL OF PHYSICAL CHEMISTRY B 108 ( 52 ) 20233 - 20239 2004.12

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Femtosecond time-resolved near-infrared spectra of TiO2 and Pt/TiO2 powders are measured at the wavelength region of 0.9-1.5 mum with the direct absorption method. Broad absorption bands of charge carriers, mainly free and trapped electrons, are observed for TiO2 and Pt/TiO2. The absorption band shape changes with a time constant of 160 A after the photoirradiation, which most probably reflects the trapping of the generated free electrons. Population decay curves of the carriers after 1 ps, obtained for three different pump light powers, are well-explained by the second-order decay kinetics with a common second-order rate constant, indicating nongeminate recombination of the electron-hole pairs. When Pt is loaded to TiO2, an additional decaying process of 2.3 ps is observed. This decay component represents the transfer of generated electrons from TiO2 to Pt, which is consistent with the known increase of overall catalytic activities by the Pt cocatalyst.

DOI： 10.1021/jp047531k

In situ surface-enhanced infrared study of hydrogen bond pairing of complementary nucleic acid bases at the electrochemical interface Reviewed

Y Sato, H Noda, F Mizutani, A Yamakata, M Osawa

ANALYTICAL CHEMISTRY 76 ( 18 ) 5564 - 5569 2004.9

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Surface-enhanced infrared absorption spectroscopy with a Kretschmann-type attenuated total reflection configuration has been used to study hydrogen-bonded pairing between 6-amino-8-purinethiol, a thiol-derivatized adenine, immobilized on a gold electrode surface, and thymidine, a complimentary base derivative of adenine, in 0. 1 M NaClO4 aqueous solution as a function of applied potential. 6-Amino-8-purinethiol is adsorbed on a gold surface via a sulfur atom to form a S-Au bond. Nearly half of the adsorbed molecules are protonated, and the long axis of the adenine moiety is tilted from the surface normal at open circuit potential. As the potential increases, the acid-base equilibrium is shifted toward the unprotonated form and the adenine moiety is reoriented toward a nearly perpendicular configuration. The hydrogen bond interaction between the adsorbed 6-amino-8purinethiol with thymidine in solution is greatly affected by the protonation and orientation of the adenine moiety and is controllable by the applied potential. Due to steric hindrance, an adenine-thymine-type hydrogen bond pair is formed only at potentials more positive than 0. 1 V (vs SCE) where the unprotonated adenine moiety is perpendicularly oriented.

DOI： 10.1021/ac049303s

Effect of annealing temperature on back electron transfer and distribution of deep trap sites in dye-sensitized TiO2, studied by time-resolved infrared spectroscopy Reviewed

K Takeshita, Y Sasaki, M Kobashi, Y Tanaka, S Maeda, A Yamakata, TA Ishibashi, H Onishi

JOURNAL OF PHYSICAL CHEMISTRY B 108 ( 9 ) 2963 - 2969 2004.3

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The effect of annealing temperature on electron dynamics in Ru complex-sensitized TiO2 films was studied by highly sensitive measurement of transient IR absorption. The amount of electron injection and the back electron transfer rate were not influenced to a large extent by annealing temperature, but the distribution of deep trap sites was considerably influenced. The difference in solar cell efficiency due to annealing temperature was mainly attributed to the difference in the nature of deep trap sites. By extending the probe light window from the mid-IR (1000-4000 cm(-1)) to the near-IR (-10000 cm(-1)) region, we investigated deep trap sites directly and found that electrons in deep trap sites have absorption in the near-IR region whose peak locates around 7500 cm(-1). As a whole, the electron dynamics in the films annealed at higher than 400 degreesC were considerably different compared with those in the films annealed at lower than 400 degreesC.

DOI： 10.1021/jp035416o

Photodynamics of NaTaO3 catalysts for efficient water splitting Reviewed

A Yamakata, T Ishibashi, H Kato, A Kudo, H Onishi

JOURNAL OF PHYSICAL CHEMISTRY B 107 ( 51 ) 14383 - 14387 2003.12

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Electrons photoexcited in catalysts based on NaTaO3 were observed by time-resolved infrared (IR) absorption spectroscopy. The electrons excited by 266-nm pump pulse exhibited a monotonic absorption of mid-IR light. The recombination kinetics of the excited electrons with holes was monitored in a vacuum as a function of time delay ranging from 100 ns to 1 s. When the Na content and La dopant were optimized to achieve high activity in the steady-state reaction of water splitting, the recombinative decay was hindered to increase the amount of electrons. The electrons were transferred to NiO ultrafine particles, loaded as a cocatalyst, within 1 mus following the pulse excitation. Exposing the catalysts to water vapor affected the electron decay and efficient electron transfer to water via the cocatalyst was evidenced.

DOI： 10.1021/jp036473k

Effects of water addition on the methanol oxidation on Pt/TiO2 photocatalyst studied by time-resolved infrared absorption spectroscopy Reviewed

A Yamakata, TA Ishibashi, J Onishi

JOURNAL OF PHYSICAL CHEMISTRY B 107 ( 36 ) 9820 - 9823 2003.9

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The reaction kinetics of electrons photoexcited in a Pt/TiO2 catalyst were observed by time-resolved infrared absorption in the presence of methanol-water vapor mixtures. The recombinative decay of the electrons was completed in microseconds on the catalyst exposed to a vacuum. The decay was suspended in the catalyst exposed to pure methanol vapor due to an effective hole-consuming reaction by adsorbed methoxy species. The suspension was released as partial water pressure was increased, indicating that the holes reacted with the methoxy species without the aid of adsorbed water or hydroxyl species. The excess electrons remaining in the catalyst were consumed by adsorbed water in a time domain of 0.1 s. The water-induced promotion of the methanol oxidation reaction described in the literature was interpreted with these results.

DOI： 10.1021/jp034997e

Time-Resolved Infrared Absorption Study of Reaction Intermediate on Pt/TiO_2 Photocatalyst Reviewed

YAMAKATA Akira, ISHIBASHI Taka-aki, ONISHI Hiroshi

J. Surf. Sci. Soc. Jpn. 24 ( 9 ) 563 - 567 2003.9

Language：Japanese Publisher：The Surface Science Society of Japan

Oxidation of 2-propanol to acetone on a Pt/TiO<Sub>2</Sub> photocatalyst by UV pulse irradiation was observed by time-resolved IR spectroscopy (TR-IR). The hole transfer to the 2-propanol, which triggers the oxidation, was completed within 0.5 μs. Transient vibrational spectra showed a new band at 1640 cm<Sup>−1</Sup>, which appeared immediately after the irradiation. This band gradually transformed to a band at 1700 cm<Sup>−1</Sup>, which was assigned to the C=O stretching mode of acetone, the product of 2-propanol oxidation. Thus, the band at 1640 cm<Sup>−1</Sup> was suggested to be the reaction intermediate that transforms to acetone. We discussed the origin of this band using density functional calculation, and an acceptable agreement was obtained with the anion radical of acetone adsorbed on the catalyst.

DOI： 10.1380/jsssj.24.563

Effects of accumulated electrons on the decay kinetics of photogenerated electrons in Pt/TiO2 photocatalyst studied by time-resolved infrared absorption spectroscopy Reviewed

A Yamakata, TA Ishibashi, H Onishi

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 160 ( 1-2 ) 33 - 36 2003.8

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE SA

The effects of accumulated electrons on the decay kinetics of photogenerated electrons in Pt/TiO2 photocatalyst were examined using time-resolved infrared (TR-IR) absorption spectroscopy. When the catalyst was irradiated by a UV pulse in the presence of methanol gas, the lifetime of the electrons was drastically elongated through the effective hole-consuming reaction by the adsorbed methoxy groups. When the catalyst was further irradiated by a second UV pulse in the presence of these long-lived electrons, the number of electrons generated by the second pulse was smaller than that generated by the first pulse though these pulse energies were the same. By increasing the interval between these two pulses, the number of electrons generated by the second pulse was gradually restored to equal that generated by the first pulse. These changes were ascribed to the enhancement of the rate of electron-hole recombination due to the long-lived electrons. (C) 2003 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S1010-6030(03)00217-X

Microsecond kinetics of photocatalytic oxidation on Pt/TiO2 traced by vibrational spectroscopy Reviewed

A Yamakata, T Ishibashi, H Onishi

CHEMICAL PHYSICS LETTERS 376 ( 5-6 ) 576 - 580 2003.7

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

2-Propanol oxidation to acetone was examined by time-resolved infrared spectroscopy on a Pt/TiO2 photocatalyst in an aqueous solution. Holes generated by the band-gap excitation were found to attach to the adsorbed reactant within the first 0.5 mus. Subsequent rearrangement of atoms in the hole-attached reactant was observed on a series of time-resolved vibrational spectra. The C=O stretching band of a reaction intermediate to be converted to acetone appeared at time delays of 0-20 mus. The observed wavenumber of the intermediate, 1640 cm(-1), was compared with theoretically predicted C=O stretching frequencies of possible species. An acceptable agreement was obtained with the anion radical of acetone adsorbed on the catalyst. (C) 2003 Elsevier B.V. All rights reserved.

DOI： 10.1016/S0009-2614(03)01034-0

Photophysics and electron dynamics in dye-sensitized semiconductor film studied by time-resolved mid-IR spectroscopy Reviewed

Kan Takeshita, Yutaka Sasaki, Masahiro Kobashi, Yuki Tanaka, Shuichi Maeda, Akira Yamakata, Taka-Aki Ishibashi, Hiroshi Onishi

Journal of Physical Chemistry B 107 ( 17 ) 4156 - 4161 2003.5

Language：English Publishing type：Research paper (scientific journal)

Photophysics and electron dynamics in dye-sensitized semiconductor film were studied by transient mid-IR spectroscopy, in particular on the nano- to millisecond time scale. As sensitizers, a Ru complex and 9-phynol xanthane derivatives were used. We simultaneously observed electrons injected into the conduction band of a semiconductor and the change of vibration bands due to formation of a cation of a dye molecule. The transient absorption components derived from these two species decayed differently. From this observation, we found that injected electrons decay through two paths
one was back electron transfer, and the other was decay to deep trap sites that cannot be detected by mid-IR light. We could also estimate the amount of electron injection for different dye-sensitized TiO2. Our transient mid-IR spectroscopy in long time scale introduces a semi-new approach to the slow dynamics in dye-sensitized semiconductors including back electron transfer.

DOI： 10.1021/jp0275645

Kinetics of the photocatalytic water-splitting reaction on TiO2 and Pt/TiO2 studied by time-resolved infrared absorption spectroscopy Reviewed

A Yamakata, T Ishibashi, H Onishi

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL 199 ( 1-2 ) 85 - 94 2003.5

Language：English Publisher：ELSEVIER SCIENCE BV

The present account describes how the water-splitting reaction on TiO2 (P-25) and Pt/TiO2 catalysts is traced by time-resolved infrared (IR) absorption spectroscopy. The ac-coupled amplification of the IR signal allows detection of transient absorbance-change as small as 10(-6) with a time-resolution of 50 ns. The TiO2 or Pt/TiO2 catalyst irradiated by a 355 run UV-pulse at time = 0 presents a transient IR absorption which monotonically increases in intensity with decreasing wavenumber from 3000 to 1000 cm(-1). Photogenerated electrons trapped in shallow mid-gap states are proposed to cause the absorption. The decay kinetics of the electrons traced by monitoring the IR absorbance at 2000 cm(-1) is sensitive to vapor atmospheres. The electrons recombine with the complementary holes along a multi-exponential rate law in the catalysts placed in a vacuum. Dioxygen arriving from the gas-phase captures the electrons at delay time of 10-100 mus following the UV irradiation. In the presence of water vapor, holes in the TiO2 catalyst are captured by an adsorbed reactant (probably hydroxyl species) within 2 mus and the recombination is obstructed thereafter. The excess electrons cannot transfer to another adsorbate to be reduced (probably proton) and hence reduce the catalyst itself. On the Pt/TiO2 catalyst exposed to water, the electron transfer takes place at 10 mus or later, following the hole transfer completed within 2 mus. The hole transfer on Pt/TiO2 is insensitive to the pressure of water vapor whereas the rate of the electron transfer is enhanced with the increasing pressure at 1-10Torr. Transient response of an adsorbate vibration is also observed. The O-H stretching band of an adsorbed hydroxyl species at 3677 cm-1 thermally shifted to the low-wavenumber side, when the TiO2 catalyst is irradiated by the UV-pulse. (C) 2003 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S1381-1169(03)00021-9

Photophysics and electron dynamics in dye-sensitized semiconductor film studied by time-resolved mid-IR spectroscopy Reviewed

K Takeshita, Y Sasaki, M Kobashi, Y Tanaka, S Maeda, A Yamakata, T Ishibashi, H Onishi

JOURNAL OF PHYSICAL CHEMISTRY B 107 ( 17 ) 4156 - 4161 2003.5

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Photophysics and electron dynamics in dye-sensitized semiconductor film were studied by transient mid-IR spectroscopy, in particular on the nano- to millisecond time scale. As sensitizers, a Ru complex and 9-phynol xanthane derivatives were used. We simultaneously observed electrons injected into the conduction band of a semiconductor and the change of vibration bands due to formation of a cation of a dye molecule. The transient absorption components derived from these two species decayed differently. From this observation, we found that injected electrons decay through two paths; one was back electron transfer, and the other was decay to deep trap sites that cannot be detected by mid-IR light. We could also estimate the amount of electron injection for different dye-sensitized TiO(2). Our transient mid-IR spectroscopy in long time scale introduces a semi-new approach to the slow dynamics in dye-sensitized semiconductors including back electron transfer.

DOI： 10.1021/jp0275645

Studies on the electron transfer reaction between TiO_2 and adsorbed dyes by time-resolved infrared spectroscopy

TAKESHITA Kan, SASAKI Yutaka, KOBASHI Masahiro, TANAKA Yuki, MAEDA Shuichi, YAMAKATA Akira, ISHIBASHI Taka-aki, ONISHI Hiroshi

触媒 45 ( 2 ) 181 - 183 2003.3

Electron-and Hole-transfer from TiO_2 Particles to Adsorbates Studied by Time-Resolved Infrared Absorption Spectroscopy Reviewed

YAMAKATA Akira, ISHIBASHI Takaki, ONISHI Hiroshi

J. Surf. Sci. Soc. Jpn. 24 ( 1 ) 46 - 52 2003.1

Language：Japanese Publisher：The Surface Science Society of Japan

Behavior of the electrons and holes photogenerated in TiO<Sub>2</Sub> particles was observed by time-resolved infrared absorption spectroscopy in the presence of oxygen, water, and methanol vapor. The electrons photogenerated by a band-gap excitation displayed a structureless, broad absorption of IR light from 3000 to 900 cm<Sup>−1</Sup>, which was assigned to the intra-conduction-band transition and/or excitation from mid-gap traps to the conduction band. This electron-induced absorption was probed as a function of time delay after the photoexcitation. Electron decay caused by the recombination with holes and by the charge-transfer reactions with adsorbates were kinetically analyzed. The electron decay was accelerated in the presence of oxygen gas due to an electron-capture reaction at the interface, whereas was decelerated in methanol vapor due to an effective hole-capture by methoxy groups. On platinized TiO<Sub>2</Sub> particles exposed to water vapor, a hole-capture reaction completed within 2 μs after band-gap excitation, whereas the electron-capture reaction occurred in 10 μs or later. These results demonstrate the effectiveness of this method to identify individual steps of photo-induced reactions at interfaces.

DOI： 10.1380/jsssj.24.46

Pressure dependence of electron- and hole-consuming reactions in photocatalytic water splitting on Pt/TiO2 studied by time-resolved IR absorption spectroscopy Reviewed

A Yamakata, T Ishibashi, H Onishi

INTERNATIONAL JOURNAL OF PHOTOENERGY 5 ( 1 ) 7 - 9 2003

Language：English Publishing type：Research paper (scientific journal) Publisher：PHOTOENERGY CENTER AIN SHAMS UNIV,

The decay kinetics of photogenerated electrons in the water splitting reaction on a Pt/TiO2 photocatalyst was studied by time-resolved IR absorption spectroscopy. The decay of the photogenerated electrons within 2 mus was decelerated when the catalyst was exposed to water vapor. The holes were consumed by the reaction with water instead of by the recombination with the electrons. On the other hand, the decay at 10-900 mus was accelerated by the exposure. The electrons were consumed by the reaction with water. The rate of the hole-consuming reaction was independent of the pressure of water vapor, whereas that of the electron-consuming reaction increased with the pressure from 1 to 10 Torr. The different pressure dependences indicate different reactants involved in the oxidative and reductive reactants.

DOI： 10.1155/s1110662x03000047

Time-resolved infrared absorption study of electron- and hole-capture reactions on photoexcited Pt/TiO2 in the presence of methanol-water vapor mixture Reviewed

A Yamakata, TA Ishibashi, H Onishi

SCIENCE AND TECHNOLOGY IN CATALYSIS 2002 145 157 - 160 2003

Language：English Publishing type：Research paper (scientific journal) Publisher：KODANSHA LTD

The decay kinetics of electrons and holes photogenerated in Pt/TiO2 was studied by time-resolved infrared absorption spectroscopy in methanol vapor, water vapor, and a mixture of the two. The holes were exhausted within 50 ns in the presence of methanol and it was concluded that they attached directly to methanol-derived adsorbates without the aid of water-derived hydroxyl radicals.

DOI： 10.1016/s0167-2991(03)80184-2

Microscopic identification of a bimolecular reaction intermediate Reviewed

Hiroshi Uetsuka, Akira Sasahara, Akira Yamakata, Hiroshi Onishi

Journal of Physical Chemistry B 106 ( 44 ) 11549 - 11552 2002.11

Language：English Publishing type：Research paper (scientific journal)

How a molecule impinging from an ambient phase attaches to and reacts with a preadsorbed reactant was studied by scanning tunneling microscopy (STM). A carboxylate (RCOO-) chemisorbed on a TiO2(110) surface was exchanged by another carboxylate (R′COO-) via an SN2-like mechanism when the RCOO--covered TiO2 surface was exposed to R′COOH vapor at room temperature or below. An R′COOH impinging from the gas phase was temporarily bound to a preadsorbed RCOO- yielding a bimolecular intermediate. The trapped R′COOH was inserted into the monolayer and dissociated to produce an adsorbed R′COO-. One of the carboxylates (RCOO- or R′COO-) was then pushed out of the monolayer to restore the intermediate and released to the vapor phase. The individual reaction steps were resolved using time-lapse imaging.

DOI： 10.1021/jp026253r

Microscopic identification of a bimolecular reaction intermediate Reviewed

H Uetsuka, A Sasahara, A Yamakata, H Onishi

JOURNAL OF PHYSICAL CHEMISTRY B 106 ( 44 ) 11549 - 11552 2002.11

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

How a molecule impinging from an ambient phase attaches to and reacts with a preadsorbed reactant was studied by scanning tunneling microscopy (STM). A carboxylate (RCOO-) chemisorbed on a TiO2(110) surface was exchanged by another carboxylate (R'COO-) via an S(N)2-like mechanism when the RCOO--covered TiO2 surface was exposed to R'COOH vapor at room temperature or below. An R'COOH impinging from the gas phase was temporarily bound to a preadsorbed RCOO- yielding a bimolecular intermediate. The trapped R'COOH was inserted into the monolayer and dissociated to produce an adsorbed R'COO-. One of the carboxylates (RCOO- or R'COO-) was then pushed out of the monolayer to restore the intermediate and released to the vapor phase. The individual reaction steps were resolved using time-lapse imaging.

DOI： 10.1021/jp026253r

Electron- and hole-capture reactions on Pt/TiO2 photocatalyst exposed to methanol vapor studied with time-resolved infrared absorption spectroscopy Reviewed

Akira Yamakata, Taka-Aki Ishibashi, Hiroshi Onishi

Journal of Physical Chemistry B 106 ( 35 ) 9122 - 9125 2002.9

Language：English Publishing type：Research paper (scientific journal)

The decay kinetics of photogenerated electrons in a Pt/TiO2 catalyst has been studied by time-resolved infrared absorption (TR-IR) spectroscopy. The electron decay was drastically affected by exposure to methanol vapor, and the electron-hole pair recombination was prevented. A certain fraction of the electrons remained beyond 1 s and slowly decayed from ∼1-9 s. The prevented recombination was interpreted with the effective capture of the holes. The extent of the hole capture was insensitive to the pressure of methanol vapor. An irreversibly adsorbed methoxy groups was proposed to capture the holes on the basis of the steady-state FT-IR spectra of the catalyst exposed to methanol vapor of different pressures. However, the slow decay of the electrons exhibited a positive-order response to the methanol pressure. Undissociated methanol physisorbed and equilibrated with the gas phase, which was identified in the steady-state spectra, should play a key role in the electron capture process. Possible mechanisms of the process are discussed.

DOI： 10.1021/jp025993x

Electron- and hole-capture reactions on Pt/TiO2 photocatalyst exposed to methanol vapor studied with time-resolved infrared absorption spectroscopy Reviewed

A Yamakata, T Ishibashi, H Onishi

JOURNAL OF PHYSICAL CHEMISTRY B 106 ( 35 ) 9122 - 9125 2002.9

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The decay kinetics of photogenerated electrons in a Pt/TiO2 catalyst has been studied by time-resolved infrared absorption TR-IR) spectroscopy. The electron decay was drastically affected by exposure to methanol vapor, and the electron-hole pair recombination was prevented. A certain fraction of the electrons remained beyond 1 s and slowly decayed from similar to 1-9 s. The prevented recombination was interpreted with the effective capture of the holes. The extent of the hole capture was insensitive to the pressure of methanol vapor. An irreversibly adsorbed methoxy groups was proposed to capture the holes on the basis of the steady-state FT-IR spectra of the catalyst exposed to methanol vapor of different pressures. However, the slow decay of the electrons exhibited a positive-order response to the methanol pressure. Undissociated methanol physisorbed and equilibrated with the gas phase, which was identified in the steady-state spectra, should play a key role in the electron capture process. Possible mechanisms of the process are discussed.

DOI： 10.1021/jp025993x

Time-resolved infrared absorption studies of surface OH groups on TiO2 particles irradiated by UV pulses Reviewed

A Yamakata, T Ishibashi, H Onishi

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 75 ( 5 ) 1019 - 1022 2002.5

Language：English Publishing type：Research paper (scientific journal) Publisher：CHEMICAL SOC JAPAN

The shift of vibrational frequency of surface OH groups on TiO2 particles induced by UV pulse irradiation has been studied by time-resolved IR absorption spectroscopy. By the UV irradiation of the TiO2 particles, the absorption intensity at 3696 cm(-1) was decreased and that at 3654 cm(-1) was increased. These changes were gradually recovered on a millisecond time scale. The transient changes were interpreted by a small (<0.1 cm(-1)) shift of a v(O-H) band at 3677 cm(-1). The temperature jump triggered by the UV pulse caused the shift.

DOI： 10.1246/bcsj.75.1019

時間分解赤外分光法を用いた二酸化チタン上の光励起電子と吸着分子への電荷移動反応の観察 Reviewed

山方啓, 石橋孝章, 大西洋

触媒 43 ( 6 ) 396 - 398 2001.9

Water- and oxygen-induced decay kinetics of photogenerated electrons in TiO2 and Pt/TiO2: A time-resolved infrared absorption study Reviewed

A Yamakata, T Ishibashi, H Onishi

JOURNAL OF PHYSICAL CHEMISTRY B 105 ( 30 ) 7258 - 7262 2001.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Electrons photogenerated in TiO2 and Pt/TiO2 catalysts were observed by time-resolved IR absorption spectroscopy. Transient IR absorption of an identical spectrum appeared on TiO2 and Pt/TiO2 irradiated by a 355 nm pump pulse. The absorption was attributed to optical transition of photogenerated electrons trapped in shallow midgap states. Electron- and hole-consuming reactions of adsorbates controlled the decay kinetics of the electrons competing with the electron-hole recombination. On TiO2, O-2 from the gas-phase captured the electrons and accelerated the decay rate at a delay time of 10-100 mus. In water vapor, holes reacted with surface hydroxyls within 2 mus, and the recombination decay of the electrons was obstructed. When Pt/TiO2 was exposed to water, the oxidation and reduction steps of the water splitting reaction affected the decay kinetics in different time domains. Photogenerated holes oxidized water within 2 mus, whereas electrons reduced water at 10-900 mus.

DOI： 10.1021/jp010802w

Time-resolved infrared absorption spectroscopy of photogenerated electrons in platinized TiO2 particles Reviewed

A Yamakata, T Ishibashi, H Onishi

CHEMICAL PHYSICS LETTERS 333 ( 3-4 ) 271 - 277 2001.1

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Kinetics of photogenerated electrons in platinized TiO2 (P-25) particles were observed by time-resolved infrared (IR) absorption spectroscopy with AC-coupled detection of cw probe light. The sample irradiated by UV pulse (355 nm and 10 ns) gave transient absorption which monotonously increased in intensity with decreasing wavenumber from 3000 to 900 cm(-1). Photogenerated electrons trapped in shallow mid-gap states were proposed to originate the transient absorption. The decay kinetics of the trapped electrons were fitted to a multi-exponential formula with six lifetimes ranging from 1 x 10(-7) to 3 x 10(-1) s. (C) 2001 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0009-2614(00)01374-9

Transport channels of X-ray beamlines at SPring-8

Goto, S, Ohashi, H, Takeshita, K, Yabashi, M, Yamakata, A, Asano, Y, Ishikawa, T

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment 467 2001

Transport channels of X-ray beamlines at SPring-8

Akira Yamakata

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 2001

Exchange reaction of formate with gas-phase acetic acid on Ni(110) Reviewed

A Yamakata, J Kubota, JN Kondo, C Hirose, K Domen, F Wakabayashi, K Tamaru

SURFACE SCIENCE 433 210 - 214 1999.8

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The exchange reaction of formate with gas-phase acetic acid on Ni(110) was studied by time resolved infrared reflection absorption spectroscopy. It was found that the preadsorbed for mate was replaced ill the acetate by the introduction of acetic acid on formate-full covered Ni(110), originated from the post-exposed acetic acid. Acetate was also replaced in formate by the introduction of formic acid on acetate-full covered Ni(110). These exchange reactions took place from 240 to 300 K, where decomposition of neither formate nor acetate was observed. Thus, it was confirmed that the preadsorbed formate or acetate was desorbed as formic or acetic acid accompanied by the transfer of hydrogen atoms from post-introduced acetic or formic acid. The activation energy of the exchange reaction of formate with post-introduced acetic acid was estimated to be 17 +/- 2 kJ mol(-1). The small activation energy of the exchange reaction is discussed on the basis of adsorption assisted desorption. (C) 1999 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0039-6028(99)00468-9

In situ observation of the exchange reaction of formate with molecular formic acid on Ni(110) Reviewed

A Yamakata, J Kubota, JN Kondo, C Hirose, K Domen, F Wakabayashi, K Tamaru

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL 141 ( 1-3 ) 73 - 82 1999.5

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The exchange reaction of adsorbed formate on Ni(110) with formic acid in gas phase was studied by the time-resolved infrared reflection absorption spectroscopy (TR-IRAS). It was found that the pre-adsorbed deuterated formate (DCOO(a)) was changed to HCOO(a) in the presence of HCOOD(g) at the temperature region from 240 to 300 K. In such a temperature region, the formate was stable on the surface in vacuum and the decomposition of formate was not observed. It was suggested that the pre-adsorbed DCOO(a) was desorbed as DCOOD accepting deuterium atom from HCOOD. The activation energy of the exchange reaction was estimated to be 23 +/- 2 kJ mol(-1). The reaction order with respect to formic acid pressure was 0.3 +/- 0.1, while that as to the coverage of DCOO(a), was unity. Taking into account all the experimental results, the exchange of pre-adsorbed formate with post-exposed formic acid is suggested to proceed via forming a hydrogen-bonded intermediate complex on the formate's site, because all the sites were already occupied by formate. The small activation energy of the exchange reaction is discussed on the basis of 'adsorption-assisted desorption'. We propose that when desorption and adsorption are coupled, the activation energy of the exchange reaction should be described as a sum of the potential energy profiles of a desorbing and an adsorbing molecule. (C) 1999 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S1381-1169(98)00251-9

Exchange reaction of adsorbed formate with gaseous formic acid on Ni(110) studied by time-resolved Fourier transform infrared reflection absorption spectroscopy Reviewed

A Yamakata, J Kubota, JN Kondo, C Hirose, K Domen, F Wakabayashi, K Tamaru

JOURNAL OF PHYSICAL CHEMISTRY B 102 ( 22 ) 4401 - 4403 1998.5

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The dynamic behavior of adsorbed formate on Ni(110) in the presence of gaseous formic acid was studied by time-resolved infrared reflection absorption spectroscopy. The preadsorbed formate (DCOO(a)) was replaced by the postexposed formic acid (HCOOD) to form HCOO(a) on Ni(110) in the temperature region between 230 and 300 K, where the formate was stable under vacuum and no decomposition of formate was observed. It was confirmed that the preadsorbed DCOO(a) desorbed as DCOOD accompanied by formation of HCOO(a) via the deuterium atom transfer from HCOOD.

DOI： 10.1021/jp981192b

The IRAS Study of the Exchange Reaction of Formate with Gaseous Formic Acid on Ni(110) Reviewed

YAMAKATA Akira, KUBOTA Jun, NOMURA Junko, HIROSE Chiaki, DOMEN Kazunari, WAKABAYASHI Fumitaka

J. Surf. Sci. Soc. Jpn. 19 ( 7 ) 441 - 445 1998

Publisher：The Surface Science Society of Japan

The exchange reaction of formate (DCOO(a)) with gaseous formic acid (HCOOD) on Ni(110) was investigated below the decomposition temperature of formate (340 K) by means of time-resolved infrared reflection absorption spectroscopy (TR-IRAS). When HCOOD gas was admitted on DCOO(a)-covered Ni(110) at 300 K, the pre-adsorbed DCOO(a) was replaced by HCOO(a). Similar replacement was also observed by introducing H<SUP>12</SUP> COOH gas onto H-<SUP>13</SUP>COO(a)-covered Ni(110). In such a temperature region from 240 to 300 K, no decomposition of formate was observed. Thus it was confirmed that those pre-adsorbed formate desorbed as formic acid accompanied by the transfer of hydrogen (deuterium) atom from post-introduced formic acid. The kinetics of the exchange reaction is investigated and the mechanism of that is also discussed.

DOI： 10.1380/jsssj.19.441

An IRAS Study of the Decomposition of Formate Adsorbed on Ni(110) Reviewed

YAMAKATA Akira, KUBOTA Jun, NOMURA Junko, HIROSE Chiaki, DOMEN Kazunari, WAKABAYASHI Fumitaka

Journal of the Surface Science Society of Japan 18 ( 7 ) 417 - 423 1997.7

Language：Japanese Publisher：日本表面科学会

The decomposition of the surface formate on Ni(110) was studied by temperature programmed desorption (TPD) and timeresolved infrared reflection absorption spectroscopy (TR-IRAS). It was observed that dehydration proceeded simultaneously with dehydrogenation. The rate-determining step of dehydration was found to be the C-H bond cleavage of formate as is the case of dehydrogenation by analysis of the kinetic isotope effect using HCOO(a) and DCOO(a). These results suggest that the rate-determining steps of dehydration and dehydrogenation are common. We propose a mechanism in which the CO₂(a) species formed via the C-H bond cleavage of formate acts as the intermediate not only for dehydrogenation but also for dehydration; dehydration takes place by dissociation of the C-O bond of CO₂(a).

DOI： 10.1380/jsssj.18.417

In situ observation of the dehydration of formate on Ni(110) Reviewed

A Yamakata, J Kubota, JN Kondo, C Hirose, K Domen, F Wakabayashi

JOURNAL OF PHYSICAL CHEMISTRY B 101 ( 26 ) 5177 - 5181 1997.6

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

The dehydration of formate adsorbed on Ni(110) has been studied by the direct observation of the CO(a) produced on the surface by means of time-resolved infrared reflection absorption spectroscopy (TR-IRAS). By the quantitative analysis of the temperature-programmed desorption and TR-IRAS results, it was found that the dehydration proceeds simultaneously with the dehydrogenation. The primary kinetic isotope effect (k(H)/k(D)) using HCOO(a) and DCOO(a) was observed not only in the dehydrogenation but also in the dehydration (k(H)/k(D) = 3.3 at 300 K). This result suggests that the rate-determining step (RDS) is the C-H bond dissociation in both processes. These suggestions let us propose a possible mechanism of the dehydration of formate on Ni(110); the RDS of the dehydration is the C-H bond dissociation which is the same as that of the dehydrogenation, and the produced CO2(a) is the precursor of the production of CO(a) and O(a).

DOI： 10.1021/jp9703418

Isotope exchange reaction of formate with molecular hydrogen on Ni(110) by IRAS Reviewed

A Yamakata, J Kubota, JN Kondo, K Domen, C Hirose

JOURNAL OF PHYSICAL CHEMISTRY 100 ( 46 ) 18177 - 18182 1996.11

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

Kinetics of the CH/CD isotope exchange reaction of formate (HCOO(a)/DCOO(a)) on Ni(110) with gaseous D-2/H-2 was investigated below the decomposition temperature (360 K) by infrared reflection absorption spectroscopy (IRAS). The apparent activation energies of HCOO(a) --> DCOO (a) and DCOO(a) --> HCOO(a) reactions were derived as 52 +/- 5 and 58 +/- 5 kJ . mol(-1), respectively. A half-order dependence of the reaction rate on hydrogen pressure was observed, suggesting that the rate-determining step was the reaction of the adsorbed formate with reversibly adsorbed hydrogen atom. The reaction of HCOO(a) with D-2 was 2.1 +/- 0.3 times faster than that of DCOO(a) with H-2 at 300 K, and the origin of the isotope effect is discussed.

DOI： 10.1021/jp9611986

SFG study of formic acid on a Pt(110)-(1x2) surface Reviewed

N Watanabe, K Iwatsu, A Yamakata, T Ohtani, J Kubota, JN Kondo, A Wada, K Domen, C Hirose

SURFACE SCIENCE 357 ( 1-3 ) 651 - 655 1996.6

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Infrared-visible sum frequency generation (IR-vis SFG) spectroscopy, infrared reflection absorption spectroscopy (IRAS), and temperature programmed desorption (TPD) spectroscopy were used to investigate the systems prepared by the adsorption of formic acid (HCOOH) onto a Pt(110)-(1 X 2) reconstructed surface. In the SFG spectra, we observed that several vibrational bands which can be assigned to the CH strerching, the OH stretching and combination modes of formic acid adsorbed in multilayers show a strong dose temperature dependence. From the IRAS measurements, it was found that the formic acid adsorbed in multilayers forms the chain structure which is called the alpha-crystalline form. By combining the results of the dose temperature dependence of SFG spectra with that of IRAS spectra, we conclude that the length of the chain, the orientation of the chain axis, and the size of the single crystalline region of formic acid strongly depend on the dose temperature. Furthermore, we found that the SFG signal of the C-H stretching band shows the intensity oscillation during the exposure to formic acid.

DOI： 10.1016/0039-6028(96)00239-7

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