Updated on 2026/06/11

写真a

 
SAITO Kenji
 
Organization
Academic Assembly Institute of Science and Technology SEISAN DESIGN KOUGAKU KEIRETU Associate Professor
Graduate School of Science and Technology Advanced Materials Science and Technology Associate Professor
Faculty of Engineering Department of Engineering Associate Professor
Title
Associate Professor
External link

Degree

  • Doctor (Engineering) ( 2007.3   Osaka University )

Research Interests

  • ナノワイヤー

  • 触媒

  • 無機多孔結晶

  • 結晶成長

Research Areas

  • Nanotechnology/Materials / Inorganic/coordination chemistry

  • Nanotechnology/Materials / Energy chemistry

  • Nanotechnology/Materials / Nanomaterials

Research History

  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Associate Professor

    2017.4

  • Niigata University   Faculty of Engineering Department of Engineering   Associate Professor

    2017.4

  • Niigata University   Institute for Research Promotion   Assistant Professor

    2016.4 - 2017.3

  • Niigata University   Headquarters for Strategy and Planning Office for Promoting the Cultivation of Young Researchers   Assistant Professor

    2012.6 - 2016.3

Professional Memberships

Committee Memberships

  •   日本化学会関東支部化学教育協議会幹事  

    2021.4 - 2022.3   

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  •   光化学討論会実行委員  

    2021   

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  •   日本化学会関東支部新潟地域懇談会事務局  

    2019.4 - 2021.3   

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  • 触媒学会   東日本地区代議員  

    2009.4 - 2012.3   

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    Committee type:Academic society

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Papers

  • Solid-State Synthesis of Niobium Carbide Electrocatalyst in the Presence of Vanadium as Suppressor of Energy Input and Greenhouse Gas Emission Reviewed

    Kenji Saito, Takahiro Jinushi, Itsuki Soga

    ACS Omega   9 ( 6 )   7069 - 7074   2024.1

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

    DOI: 10.1021/acsomega.3c09045

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  • Electron Transfer Reduction by Hydrogen Creates Porosity in Tantalate Crystals and Produce Multifunctionality Reviewed

    Kenji Saito, Yuma Takahashi, Daichi Kuwabara, Yoshiki Watanabe

    ACS Applied Materials & Interfaces   15 ( 46 )   53665 - 53670   2023.11

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsami.3c10246

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  • Mechanism of H<sup>+</sup> dissociation–induced O–O bond formation via intramolecular coupling of vicinal hydroxo ligands on low-valent Ru(III) centers

    Yuki Tanahashi, Kosuke Takahashi, Yuta Tsubonouchi, Shunsuke Nozawa, Shin Ichi Adachi, Masanari Hirahara, Eman A. Mohamed, Zaki N. Zahran, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Proceedings of the National Academy of Sciences of the United States of America   118 ( 52 )   2021.12

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1073/pnas.2113910118

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  • Highly Efficient Electrocatalytic Water Oxidation by a Transparent Ordered Mesoporous Film of Intermediate IrOx(OH)y

    Debraj Chandra, Tomohiro Katsuki, Takeshi Masaki, Naoto Abe, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ACS Applied Energy Materials   4 ( 5 )   4355 - 4364   2021.5

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

    DOI: 10.1021/acsaem.0c03125

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  • Concisely Synthesized FeNiWOx Film as a Highly Efficient and Robust Catalyst for Electrochemical Water Oxidation

    Zaki N. Zahran, Eman A. Mohamed, Yuta Tsubonouchi, Manabu Ishizaki, Takanari Togashi, Masato Kurihara, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ACS Applied Energy Materials   4 ( 2 )   1410 - 1420   2021.2

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

    DOI: 10.1021/acsaem.0c02628

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  • Electrocatalytic water splitting with unprecedentedly low overpotentials by nickel sulfide nanowires stuffed into carbon nitride scabbards

    Zaki Zahran, Eman Mohamed, Yuta Tsubonouchi, Manabu Ishizaki, Takanari Togashi, Masato Kurihara, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Energy & Environmental Science   2021

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

    <p>Electrocatalytic water splitting to oxygen and hydrogen has much attention as one of the most promising approaches for sustainable production of hydrogen as a carbon-neutral fuel. To establish efficient electrocatalytic...</p>

    DOI: 10.1039/d1ee00509j

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  • High Potential-Applied Catalyst Behavior of a Mononuclear Ruthenium(II) Complex on a Mesoporous ITO Electrode for Water Oxidation

    Yuta Tsubonouchi, Yuki Tanahashi, Tatsuya Eo, Junichiro Honta, Taisei Sato, Eman A. Mohamed, Zaki N. Zahran, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Journal of The Electrochemical Society   167 ( 16 )   166515 - 166515   2020.12

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    Publishing type:Research paper (scientific journal)   Publisher:The Electrochemical Society  

    DOI: 10.1149/1945-7111/abd3ba

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    Other Link: https://iopscience.iop.org/article/10.1149/1945-7111/abd3ba/pdf

  • Efficient Electrocatalytic Water Oxidation by a Dinuclear Ruthenium(II) Complex with Vicinal Aquo and Hydroxo Groups Adsorbed on a TiO2 Electrode

    Yuki Tanahashi, Sho Nagai, Yuta Tsubonouchi, Masanari Hirahara, Taisei Sato, Eman A. Mohamed, Zaki N. Zahran, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ACS Applied Energy Materials   3 ( 12 )   12172 - 12184   2020.12

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

    DOI: 10.1021/acsaem.0c02242

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  • Molecular aspects, electrochemical properties and water oxidation catalysis on a nanoporous TiO<inf>2</inf> electrode anchoring a mononuclear ruthenium(II) aquo complex Reviewed

    Yuta Tsubonouchi, Tatsuya Eo, Junichiro Honta, Taisei Sato, Eman A. Mohamed, Zaki N. Zahran, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Journal of Photochemistry and Photobiology A: Chemistry   400   2020.9

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jphotochem.2020.112696

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  • Highly Efficient and Selective Electrocatalytic CO2-to-CO Conversion by a Non-heme Iron Complex with an In-Plane N-4 Ligand in Heterogeneous Aqueous Media Reviewed

    Eman A. Mohamed, Zaki N. Zahran, Yuta Tsubonouchi, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ACS APPLIED ENERGY MATERIALS   3 ( 5 )   4114 - 4120   2020.5

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

    DOI: 10.1021/acsaem.9b02548

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  • Multi-potential-step chronocoulospectrometry for electrocatalytic water oxidation by a mononuclear ruthenium aquo complex immobilized on a mesoporous ITO electrode. Reviewed International journal

    Yuta Tsubonouchi, Junichiro Honta, Taisei Sato, Eman A Mohamed, Zaki N Zahran, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Dalton transactions (Cambridge, England : 2003)   49 ( 5 )   1416 - 1423   2020.2

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    A new mononuclear Ru aquo complex [Ru(C8Otpy)(H2dcbpy)(OH2)]2+ with 4,4'-dicarboxy-2,2'-bipyridine (H2dcbpy) and 4'-octyloxy-2,2':6',2''-terpyridine (C8Otpy) ligands was synthesized to investigate electrocatalytic water oxidation by the complex immobilized on a mesoporous indium-doped tin oxide (meso-ITO) electrode using a multi-potential-step chronocoulospectrometric (MPSCCS) technique. UV-visible absorption spectroscopic data indicated that [Ru(C8Otpy)(dcbpy)(OH2)] (RuOH2) is deprotonated to [Ru(C8Otpy)(dcbpy)(OH)]- (RuOH) on the meso-ITO surface even at pH 5.9 of the electrolyte solution. The cyclic voltammogram (CV) of the RuOH/meso-ITO electrode showed a pH-independent redox response at E1/2 = 0.80 V vs. Ag/AgCl in the pH range of 5-12, being assigned to a non-proton-coupled 1e- redox process of RuIIOH/RuIIIOH. The MPSCCS measurement of the RuOH/meso-ITO electrode between 0.2 and 1.5 V vs. Ag/AgCl showed that RuIV species (tentatively RuIVO) exist in a steady state of the electrocatalysis in the initial stage. This suggests that the electrochemical oxidation from RuIVO to RuVO could compete with the water nucleophilic attack for O-O bond formation involved in the rate-determining step under the employed conditions. The possibility that the water nucleophilic attack on RuIVO could also compete with the electrochemical oxidation of RuIVO to RuVO was suggested by the electrocatalytic water oxidation at a low applied potential of 1.4 V prior to the formation potential of RuVO. The MPSCCS measurement at 1.4 V for 1 h showed that RuOH is gradually transformed into an alternative catalyst (most likely RuOx nanoparticles) on the electrode. The MPSCCS technique is promising to reveal the redox reactions and catalytic aspects of molecular catalysts immobilized on an electrode for water oxidation.

    DOI: 10.1039/c9dt04442f

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  • Two Different Multiple Photosynthetic Reaction Centers Using Either Zinc Porphyrinic Oligopeptide-Fulleropyrrolidine or Free-Base Porphyrinic Polypeptide-Li+@C(60)Supramolecular Complexes

    Nathalie Solladie, Shunichi Fukuzumi, Kei Ohkubo, Francis D'Souza, Regis Rein, Kenji Saito, Vincent Troiani, Hongjin Qiu, Suresh Gadde, Tetsuya Hasegawa

    ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY   9 ( 6 )   2020.1

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

    DOI: 10.1149/2162-8777/abaaf5

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  • Characterization and Mechanism of Efficient Visible-Light-Driven Water Oxidation on an in Situ N-2-Intercalated WO3 Nanorod Photoanode Reviewed

    Chandra Debraj, Li Dong, Sato Tetsuya, Tanahashi Yuki, Togashi Takanari, Ishizaki Manabu, Kurihara Masato, Mohamed Eman A, Tsubonouchi Yuta, Zahran Zaki N, Saito Kenji, Yui Tatsuto, Yagi Masayuki

    ACS SUSTAINABLE CHEMISTRY & ENGINEERING   7 ( 21 )   17896 - 17906   2019.11

  • Critical Hammett Electron-Donating Ability of Substituent Groups for Efficient Water Oxidation Catalysis by Mononuclear Ruthenium Aquo Complexes Reviewed

    Watabe Shunsuke, Tanahashi Yuki, Hirahara Masanari, Yamazaki Hirosato, Takahashi Kosuke, Mohamed Eman A, Tsubonouchi Yuta, Zahran Zaki N, Saito Kenji, Yu Tatsuto, Yagi Masayuki

    INORGANIC CHEMISTRY   58 ( 19 )   12716 - 12723   2019.10

  • Facile and sustainable fabrication of transparent mesoporous IrO<sub>x</sub> films formed by nanoparticle assembly for efficient electrocatalytic water oxidation

    Debraj Chandra, Tsubasa Sato, Naoto Abe, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Sustainable Energy &amp; Fuels   3 ( 12 )   3489 - 3497   2019

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

    <p>A new transparent mesoporous IrOx film consisting of small interconnected nanoparticles has been developed by a simple drop-cast method to provide an efficient electrocatalyst film for water oxidation.</p>

    DOI: 10.1039/c9se00731h

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  • Facile and sustainable fabrication of transparent mesoporous IrOx films formed by nanoparticles assembly for efficient electrocatalytic water oxidation Reviewed

    D. Chandra, T. Sato, N. Abe, K. Saito, T. Yui, M. Yagi

    Sustainable Energy Fuels   in press   2019

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  • Critical Hammett electron-donating ability of substituent groups for efficient water oxidation catalysis by mononuclear ruthenium aquo complexes

    S. Watabe, Y. Tanahashi, M. Hirahara, H. Yamazaki, K. Takahashi, E. A. Mohamed, Y. Tsubonouchi, Z. N. Zahran, K. Saito, T. Yui, M. Yagi

    Inorg. Chem.   58   12716 - 12723   2019

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  • An efficient catalyst film fabricated by electrophoretic deposition of cobalt hydroxide for electrochemical water oxidation Reviewed

    Ryouchi Takeuchi, Tetsuya Sato, Takeshi Masaki, Kaoru Aiso, Debraj Chandra, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Journal of Photochemistry and Photobiology A: Chemistry   358   395 - 401   2018.5

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    DOI: 10.1016/j.jphotochem.2017.09.052

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  • Visible Light-Driven Water Oxidation on an In Situ N2-Intercalated WO3 Nanorod Photoanode Synthesized by a Dual-Functional Structure-Directing Agent Reviewed

    Dong Li, Ryouchi Takeuchi, Debraj Chandra, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ChemSusChem   11 ( 7 )   1151 - 1156   2018.4

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    DOI: 10.1002/cssc.201702439

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  • Cover Feature: Visible Light-Driven Water Oxidation on an In Situ N<sub>2</sub> -Intercalated WO<sub>3</sub> Nanorod Photoanode Synthesized by a Dual-Functional Structure-Directing Agent (ChemSusChem 7/2018)

    Dong Li, Ryouchi Takeuchi, Debraj Chandra, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ChemSusChem   11 ( 7 )   1134 - 1134   2018.3

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

    DOI: 10.1002/cssc.201800593

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  • Preparation of Stable Silver Nanoparticles Having Wide Red-To-Near-Infrared Extinction Reviewed

    Kawamura Shiori, Matsubara Kazuki, Sakai Sotaro, Sasaki Kazuhisa, Saito Masataro, Saito Kenji, Yagi Masayuki, Norimatsu Wataru, Sasai Ryo, Kusunoki Michiko, Eguchi Miharu, Yin Shu, Asakura Yusuke, Yui Tatsuto

    GLOBAL CHALLENGES   2 ( 3 )   2018.3

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

    DOI: 10.1002/gch2.201700105

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  • Facile Templateless Fabrication of a Cobalt Oxyhydroxide Nanosheet Film with Nanoscale Porosity as an Efficient Electrocatalyst for Water Oxidation Reviewed

    Chandra Debraj, Tanaka Kou, Takeuchi Ryouchi, Abe Naoto, Togashi Takanari, Kurihara Masato, Saito Kenji, Yui Tatsuto, Yagi Masayuki

    CHEMPHOTOCHEM   2 ( 3 )   332 - 339   2018.3

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/cptc.201700200

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  • Tunable mesoporous structure of crystalline WO3 photoanode towards efficient visible-light-driven water oxidation Reviewed

    D. Chandra, K. Saito, T. Yui, M. Yagi

    ACS Sustainable Chem. Eng.   6 ( 12 )   16838 - 16846   2018

  • Superior Inorganic Ion Cofactors of Tetraborate Species Attaining Highly Efficient Heterogeneous Electrocatalysis for Water Oxidation on Cobalt Oxyhydroxide Nanoparticles Reviewed

    Ryouchi Takeuchi, Tetsuya Sato, Kou Tanaka, Kaoru Aiso, Debraj Chandra, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ACS APPLIED MATERIALS & INTERFACES   9 ( 42 )   36955 - 36961   2017.10

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

    DOI: 10.1021/acsami.7b13817

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  • Mechanistic Insight into Reversible Core Structural Changes of Dinuclear mu-Hydroxoruthenium(II) Complexes with a 2,8-Di-2-pyridyl-1,9,10-anthyridine Backbone Prior to Water Oxidation Catalysis Reviewed

    Masanari Hirahara, Sho Nagai, Kosuke Takahashi, Shunsuke Watabe, Taisei Sato, Kenji Saito, Tatsuto Yui, Yasushi Umemura, Masayuki Yagi

    INORGANIC CHEMISTRY   56 ( 17 )   10235 - 10246   2017.9

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    DOI: 10.1021/acs.inorgchem.7b00978

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  • Morphology Control of Energy-Gap-Engineered Nb2O5 Nanowires and the Regioselective Growth of CdS for Efficient Carrier Transfer Across an Oxide-Sulphide Nanointerface Reviewed

    Tomoki Shinohara, Miyu Yamada, Yuki Sato, Shohei Okuyama, Tatsuto Yui, Masayuki Yagi, Kenji Saito

    SCIENTIFIC REPORTS   7   2017.7

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

    DOI: 10.1038/s41598-017-05292-2

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  • Polymer surfactant-assisted tunable nanostructures of amorphous IrOx thin films for efficient electrocatalytic water oxidation Reviewed

    Debraj Chandra, Tsubasa Sato, Ryouchi Takeuchi, Dong Li, Takanari Togashi, Masato Kurihara, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    CATALYSIS TODAY   290   51 - 58   2017.7

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    DOI: 10.1016/j.cattod.2017.03.009

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  • Dual-Functional Surfactant-Templated Strategy for Synthesis of an In Situ N-2-Intercalated Mesoporous WO3 Photoanode for Efficient Visible-Light-Driven Water Oxidation Reviewed

    Dong Li, Debraj Chandra, Ryouchi Takeuchi, Takanari Togashi, Masato Kurihara, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    CHEMISTRY-A EUROPEAN JOURNAL   23 ( 27 )   6596 - 6604   2017.5

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    DOI: 10.1002/chem.201700088

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  • Light Energy Accumulation from Pyrene Derivative to Tris(bipyridine)ruthenium on Clay Surface Reviewed

    Daiki Morimoto, Haruya Yoshida, Keita Sato, Kenji Saito, Masayuki Yagi, Shinsuke Takagi, Tatsuto Yui

    LANGMUIR   33 ( 15 )   3680 - 3684   2017.4

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

    DOI: 10.1021/acs.langmuir.7b00512

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  • Color tuning of cationic pyrene derivatives on a clay nanosheet: Retardation of gradual redshift on clay Reviewed

    Daiki Morimoto, Keita Sato, Kenji Saito, Masayuki Yagi, Shinsuke Takagi, Tatsuto Yui

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   337   112 - 117   2017.3

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

    DOI: 10.1016/jjphotochem.2017.01.023

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  • Carbonate Ions Induce Highly Efficient Electrocatalytic Water Oxidation by Cobalt Oxyhydroxide Nanoparticles Reviewed

    Kaoru Aiso, Ryouchi Takeuchi, Takeshi Masaki, Debraj Chandra, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    CHEMSUSCHEM   10 ( 4 )   687 - 692   2017.2

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    DOI: 10.1002/cssc.201601494

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  • In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films Reviewed

    Kazuhisa Sasaki, Kazuki Matsubara, Shiori Kawamura, Kenji Saito, Masayuki Yagi, Tatsuto Yui

    JOVE-JOURNAL OF VISUALIZED EXPERIMENTS   ( 119 )   2017.1

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    DOI: 10.3791/55169

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  • Characterization of Interfacial Charge-Transfer Photoexcitation of Polychromium-Oxo-Electrodeposited TiO2 as an Earth-Abundant Photoanode for Water Oxidation Driven by Visible Light Reviewed

    Debraj Chandra, Ryougen Tsuriya, Tsubasa Sato, Daisuke Takama, Naoto Abe, Masashi Kajita, Dong Li, Takanari Togashi, Masato Kurihara, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    CHEMPLUSCHEM   81 ( 10 )   1116 - 1122   2016.10

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    DOI: 10.1002/cplu.201600288

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  • Highly Efficient Electrocatalysis and Mechanistic Investigation of Intermediate IrOx(OH)(y) Nanoparticle Films for Water Oxidation Reviewed

    Debraj Chandra, Daisuke Takama, Takeshi Masaki, Tsubasa Sato, Naoto Abe, Takanari Togashi, Masato Kurihara, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ACS CATALYSIS   6 ( 6 )   3946 - 3954   2016.6

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    DOI: 10.1021/acscatal.6b00621

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  • In-situ synthesis of gold nanoparticles without cohesion in the interlayer space of layered titanate transparent films Reviewed

    K. Sasaki, K. Matsubara, S. Kawamura, K. Saito, M. Yagi, T. Yui

    J. Vis. Exp.   e55169   1 - 10   2016

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  • Synthesis of copper nanoparticles within the interlayer space of titania nanosheet transparent films Reviewed

    Kazuhisa Sasaki, Kazuki Matsubara, Shiori Kawamura, Kenji Saito, Masayuki Yagi, Wataru Norimatsu, Ryo Sasai, Tatsuto Yui

    JOURNAL OF MATERIALS CHEMISTRY C   4 ( 7 )   1476 - 1481   2016

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

    DOI: 10.1039/c5tc03152d

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  • Photocatalytic reduction of nitrate ions to dinitrogen over layered perovskite BaLa4Ti4O15 using water as an electron donor Reviewed

    Marie Oka, Yugo Miseki, Kenji Saito, Akihiko Kudo

    APPLIED CATALYSIS B-ENVIRONMENTAL   179   407 - 411   2015.12

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    DOI: 10.1016/j.apcatb.2015.05.037

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  • Spectroelectrochemical investigation of electrocatalytic water oxidation by a mononuclear ruthenium complex in a homogeneous solution Reviewed

    Junichiro Honta, Syouhei Tajima, Taisei Sato, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   313   126 - 130   2015.12

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    DOI: 10.1016/j.jphotochem.2015.06.010

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  • Emission amplification of Ru(bpy)(3)(2+) via energy transfer from pyrene derivatives on synthesized clay Reviewed

    Keita Sato, Satomi Hagiwara, Daiki Morimoto, Kenji Saito, Masayuki Yagi, Shinsuke Takagi, Tatsuto Yui

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   313   9 - 14   2015.12

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    DOI: 10.1016/j.jphotochem.2015.05.015

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  • Influence of chloro substituent on photoisomerization, redox reactions and water oxidation catalysis of mononuclear ruthenium complexes Reviewed

    Kosuke Takahashi, Xiaohong Zhang, Masanari Hirahara, Taisei Sato, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   313   117 - 125   2015.12

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    DOI: 10.1016/j.jphotochem.2015.05.029

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  • Intercrystal Self-Assembly for the Design of High-Quality Nickel Molybdate Nanocrystals Reviewed

    Kenji Saito, Shotaro Kazama, Yuki Sato, Tatsuto Yui, Masayuki Yagi

    INORGANIC CHEMISTRY   54 ( 18 )   8869 - 8871   2015.9

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    DOI: 10.1021/acs.inorgchem.5b00625

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  • New Series of Dinuclear Ruthenium(II) Complexes Synthesized Using Photoisomerization for Efficient Water Oxidation Catalysis Reviewed

    Masanari Hirahara, Sho Nagai, Kosuke Takahashi, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    INORGANIC CHEMISTRY   54 ( 15 )   7627 - 7635   2015.8

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    DOI: 10.1021/acs.inorgchem.5b01264

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  • Mechanisms and Factors Controlling Photoisomerization Equilibria, Ligand Exchange, and Water Oxidation Catalysis Capabilities of Mononuclear Ruthenium(II) Complexes Reviewed

    Masanari Hirahara, Tomoya Hakamata, Aaron B. League, Mehmed Z. Ertem, Kosuke Takahashi, Sho Nagai, Keisuke Inaba, Hirosato Yamazaki, Kenji Saito, Tatsuto Yui, Christopher J. Cramer, Masayuki Yagi

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY   ( 23 )   3892 - 3903   2015.8

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    DOI: 10.1002/ejic.201500642

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  • Open Pore Architecture of an Ordered Mesoporous IrO2 Thin Film for Highly Efficient Electrocatalytic Water Oxidation Reviewed

    Debraj Chandra, Naoto Abe, Daisuke Takama, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    CHEMSUSCHEM   8 ( 5 )   795 - 799   2015.3

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    DOI: 10.1002/cssc.201402911

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  • Sustainable Synthesis of Niobia Thin Films with Open Mesopore Channels Reviewed

    Kenji Saito, Yuki Sato, Shohei Okuyama, Kazuki Matsubara, Tatsuto Yui, Masayuki Yagi

    INORGANIC CHEMISTRY   54 ( 5 )   2171 - 2175   2015.3

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  • Remarkable Stimulation of Emission Quenching on a Clay Surface Reviewed

    Keita Sato, Kazuki Matsubara, Satomi Hagiwara, Kenji Saito, Masayuki Yagi, Shinsuke Takagi, Tatsuto Yui

    LANGMUIR   31 ( 1 )   27 - 31   2015.1

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    DOI: 10.1021/la504597t

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  • Facile and simple fabrication of an efficient nanoporous WO3 photoanode for visible-light-driven water splitting Reviewed

    Xiaohong Zhang, Debraj Chandra, Masashi Kajita, Hidehito Takahashi, Li Dong, Akinori Shoji, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   39 ( 35 )   20736 - 20743   2014.12

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    DOI: 10.1016/j.ijhydene.2014.06.062

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  • Unique and facile solvothermal synthesis of mesoporous WO3 using a solid precursor and a surfactant template as a photoanode for visible-light-driven water oxidation Reviewed

    Dong Li, Debraj Chandra, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    NANOSCALE RESEARCH LETTERS   9   2014.10

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    DOI: 10.1186/1556-276X-9-542

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  • The KCaSrTa5O15 photocatalyst with tungsten bronze structure for water splitting and CO2 reduction Reviewed

    Tomoaki Takayama, Kentaro Tanabe, Kenji Saito, Akihide Iwase, Akihiko Kudo

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   16 ( 44 )   24417 - 24422   2014

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    DOI: 10.1039/c4cp03892d

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  • Visible-light-driven water oxidation at a polychromium-oxo-electrodeposited TiO2 electrode as a new type of earth-abundant photoanode Reviewed

    Masashi Kajita, Kenji Saito, Naoto Abe, Akinori Shoji, Kazuki Matsubara, Tatsuto Yui, Masayuki Yagi

    CHEMICAL COMMUNICATIONS   50 ( 10 )   1241 - 1243   2014

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    DOI: 10.1039/c3cc47764a

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  • A visible light responsive rhodium and antimony-codoped SrTiO3 powdered photocatalyst loaded with an IrO2 cocatalyst for solar water splitting Reviewed

    Rikako Asai, Hiroaki Nemoto, Qingxin Jia, Kenji Saito, Akihide Iwase, Akihiko Kudo

    CHEMICAL COMMUNICATIONS   50 ( 19 )   2543 - 2546   2014

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    DOI: 10.1039/c3cc49279f

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  • Crystallization of Tungsten Trioxide Having Small Mesopores: Highly Efficient Photoanode for Visible-Light-Driven Water Oxidation Reviewed

    Debraj Chandra, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   52 ( 48 )   12606 - 12609   2013.11

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    DOI: 10.1002/anie.201306004

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  • Monoclinic Ag2Mo2O7 Nanowire: A New Ag-Mo-O Nanophotocatalyst Material Reviewed

    Kenji Saito, Shotaro Kazama, Kazuki Matsubara, Tatsuto Yui, Masayuki Yagi

    INORGANIC CHEMISTRY   52 ( 15 )   8297 - 8299   2013.8

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    DOI: 10.1021/ic401236b

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  • Arrangement effect of the di-μ-oxo dimanganese catalyst and Ru(bpy) 32+ photoexcitation centers adsorbed on mica for visible-light-derived water oxidation Reviewed

    Masanari Hirahara, Hirosato Yamazaki, Satoshi Yamada, Kazuki Matsubara, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Catalysis Science and Technology   3 ( 7 )   1776 - 1781   2013.7

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    DOI: 10.1039/c3cy00010a

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  • Fabrication of highly crystalline SnNb2O6 shell with a visible-light response on a NaNbO3 nanowire core Reviewed

    Kenji Saito, Akihiko Kudo

    Inorganic Chemistry   52 ( 10 )   5621 - 5623   2013.5

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    DOI: 10.1021/ic4002175

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  • Diameter-dependent photocatalytic performance of niobium pentoxide nanowires Reviewed

    Kenji Saito, Akihiko Kudo

    DALTON TRANSACTIONS   42 ( 19 )   6867 - 6872   2013

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    DOI: 10.1039/c3dt32924k

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  • Adsorptive and Kinetic Properties on Photocatalytic Hydrogenation of Aromatic Ketones upon UV Irradiated Polycrystalline Titanium Dioxide: Differences between Acetophenone and Its Trifluoromethylated Derivative Reviewed

    Shigeru Kohtani, Eito Yoshioka, Kenji Saito, Akihiko Kudo, Hideto Miyabe

    JOURNAL OF PHYSICAL CHEMISTRY C   116 ( 33 )   17705 - 17713   2012.8

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    DOI: 10.1021/jp3056174

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  • Photocatalytic Reduction of Carbon Dioxide over Ag Cocatalyst-Loaded ALa(4)Ti(4)O(15) (A = Ca, Sr, and Ba) Using Water as a Reducing Reagent Reviewed

    Kosuke Iizuka, Tomoaki Wato, Yugo Miseki, Kenji Saito, Aldhiko Kudo

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   133 ( 51 )   20863 - 20868   2011.12

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    DOI: 10.1021/ja207586e

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  • Multiple photosynthetic reaction centers composed of supramolecular assemblies of a zinc porphyrin dendrimer with pyridylnaphthalenediimide Reviewed

    Shunichi Fukuzumi, Kei Ohkubo, Kenji Saito, Yukiyasu Kashiwagi, Tony Khoury, Maxwell J. Crossley

    JOURNAL OF PORPHYRINS AND PHTHALOCYANINES   15 ( 11-12 )   1292 - 1298   2011.11

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    DOI: 10.1142/S1088424611004178

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  • Molten Salt Treatment of Sodium Niobate Nanowires Affording Valence Band-Controlled (AgNbO3)-(NaNbO3) Nanowires Invited Reviewed

    Kenji Saito, Kazunori Koga, Akihiko Kudo

    NANOSCIENCE AND NANOTECHNOLOGY LETTERS   3 ( 5 )   686 - 689   2011.10

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    DOI: 10.1166/nnl.2011.1226

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  • Multiple photosynthetic reaction centres using zinc porphyrinic oligopeptide-fulleropyrrolidine supramolecular complexes Reviewed

    Shunichi Fukuzumi, Kenji Saito, Kei Ohkubo, Vincent Troiani, Hongjin Qiu, Suresh Gadde, Francis D'Souza, Nathalie Solladie

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   13 ( 38 )   17019 - 17022   2011

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    DOI: 10.1039/c1cp22364j

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  • Multiple photosynthetic reaction centres composed of supramolecular assemblies of zinc porphyrin dendrimers with a fullerene acceptor Reviewed

    Shunichi Fukuzumi, Kenji Saito, Kei Ohkubo, Tony Khoury, Yukiyasu Kashiwagi, Mark A. Absalom, Suresh Gadde, Francis D&apos;Souza, Yasuyuki Araki, Osamu Ito, Maxwell J. Crossley

    CHEMICAL COMMUNICATIONS   47 ( 28 )   7980 - 7982   2011

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    DOI: 10.1039/c1cc11725d

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  • Lithium niobate nanowires for photocatalytic water splitting Reviewed

    Kenji Saito, Kazunori Koga, Akihiko Kudo

    DALTON TRANSACTIONS   40 ( 15 )   3909 - 3913   2011

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    DOI: 10.1039/c0dt01844a

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  • InBO3 Photocatalyst with Calcite Structure for Overall Water Splitting Reviewed

    Qingxin Jia, Yugo Miseki, Kenji Saito, Hisayoshi Kobayashi, Akihiko Kudo

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   83 ( 10 )   1275 - 1281   2010.10

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    DOI: 10.1246/bcsj.20100137

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  • Photocatalytic hydrogenation of acetophenone derivatives and diaryl ketones on polycrystalline titanium dioxide Reviewed

    Shigeru Kohtani, Eito Yoshioka, Kenji Saito, Akihiko Kudo, Hideto Miyabe

    CATALYSIS COMMUNICATIONS   11 ( 13 )   1049 - 1053   2010.7

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    DOI: 10.1016/j.catcom.2010.04.022

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  • Niobium-Complex-Based Syntheses of Sodium Niobate Nanowires Possessing Superior Photocatalytic Properties Reviewed

    Kenji Saito, Akihiko Kudo

    INORGANIC CHEMISTRY   49 ( 5 )   2017 - 2019   2010.3

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    DOI: 10.1021/ic902107u

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  • Solar hydrogen production over novel metal sulfide photocatalysts of AGa(2)In(3)S(8) (A = Cu or Ag) with layered structures Reviewed

    Hiroshi Kaga, Kenji Saito, Akihiko Kudo

    CHEMICAL COMMUNICATIONS   46 ( 21 )   3779 - 3781   2010

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    DOI: 10.1039/b927362j

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  • Solar Water Splitting Using Powdered Photocatalysts Driven by Z-Schematic Interparticle Electron Transfer without an Electron Mediator Reviewed

    Yasuyoshi Sasaki, Hiroaki Nemoto, Kenji Saito, Akihiko Kudo

    JOURNAL OF PHYSICAL CHEMISTRY C   113 ( 40 )   17536 - 17542   2009.10

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    DOI: 10.1021/jp907128k

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  • Controlled Synthesis of TT Phase Niobium Pentoxide Nanowires Showing Enhanced Photocatalytic Properties Reviewed

    Kenji Saito, Akihiko Kudo

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   82 ( 8 )   1030 - 1034   2009.8

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    DOI: 10.1246/bcsj.82.1030

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  • Sensitization of NaMO3 (M: Nb and Ta) Photocatalysts with Wide Band Gaps to Visible Light by Ir Doping Reviewed

    Akihide Iwase, Kenji Saito, Akihiko Kudo

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   82 ( 4 )   514 - 518   2009.4

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    DOI: 10.1246/bcsj.82.514

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  • Nanocrystalline CaZrTi2O7 Photocatalyst Prepared by a Polymerizable Complex Method in the Presence of Cs2CO3 Flux for Water Splitting Reviewed

    Yugo Miseki, Kenji Saito, Akihiko Kudo

    CHEMISTRY LETTERS   38 ( 2 )   180 - 181   2009.2

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    DOI: 10.1246/cl.2009.180

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  • Synthesis, Characterization, Redox Properties, and Photodynamics of Donor-Acceptor Nanohybrids Composed of Size-Controlled Cup-Shaped Nanocarbons and Porphyrins Reviewed

    Masataka Ohtani, Kenji Saito, Shunichi Fukuzumi

    CHEMISTRY-A EUROPEAN JOURNAL   15 ( 36 )   9160 - 9168   2009

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  • Bis-ortho-diynyl-arene C(60) adducts on SnO(2) films for photoelectrochemical cells Reviewed

    Kenji Saito, Arno S. Rettenbacher, Dennis W. Smith, Shunichi Fukuzumi

    JOURNAL OF MATERIALS CHEMISTRY   18 ( 27 )   3237 - 3241   2008

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    DOI: 10.1039/b717906e

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  • Nondestructive formation of supramolecular nanohybrids of single-walled carbon nanotubes with flexible porphyrinic polypeptides Reviewed

    Kenji Saito, Vincent Troiani, Hongjin Qiu, Nathalie Solladie, Takao Sakata, Hirotaro Mori, Mitsuo Ohama, Shunichi Fukuzumi

    JOURNAL OF PHYSICAL CHEMISTRY C   111 ( 3 )   1194 - 1199   2007.1

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    DOI: 10.1021/jp065615i

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  • Nanostructural control of cup-stacked carbon nanotubes with 1-benzyl-1,4-dihydronicotinamide dimer via photoinduced electron transfer Reviewed

    Kenji Saito, Masataka Ohtani, Shunichi Fukuzumi

    CHEMICAL COMMUNICATIONS   ( 1 )   55 - 57   2007

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    DOI: 10.1039/b614181a

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  • Organic solar cells. Supramolecular composites of porphyrins and fullerenes organized by polypeptide structures as light harvesters Reviewed

    Taku Hasobe, Kenji Saito, Prashant V. Kamat, Vincent Troiani, Hongjin Qiu, Nathalie Solladie, Kil Suk Kim, Jong Kang Park, Dongho Kim, Francis D'Souza, Shunichi Fukuzumi

    JOURNAL OF MATERIALS CHEMISTRY   17 ( 39 )   4160 - 4170   2007

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    DOI: 10.1039/b706678c

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  • Electron-transfer reduction of cup-stacked carbon nanotubes affording cup-shaped carbons with controlled diameter and size Reviewed

    Kenji Saito, Masataka Ohtani, Shunichi Fukuzumi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   128 ( 44 )   14216 - 14217   2006.11

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    DOI: 10.1021/ja064300d

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  • Stereoselective preparation, structures, and reactivities of phosphine-bridged mixed-metal trinuclear and pentanuclear complexes with tris[2-(diphenylphosphino)ethyl]phosphine Reviewed

    S Aizawa, K Saito, T Kawamoto, E Matsumoto

    INORGANIC CHEMISTRY   45 ( 12 )   4859 - 4866   2006.6

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    DOI: 10.1021/ic060277l

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  • An extremely long-lived charge-separated state of zinc tetraphenylporphyrin coordinated with pyridylnaphthalene-diimide Reviewed

    Kenji Saito, Yukiyasu Kashiwagi, Kei Ohkubo, Shunichi Fukuzumi

    JOURNAL OF PORPHYRINS AND PHTHALOCYANINES   10 ( 12 )   1371 - 1379   2006

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    DOI: 10.1142/S1088424606000740

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  • Preparation of mixed-metal polynuclear complexes by stepwise phosphine-bridging reaction Reviewed

    S Aizawa, T Kawamoto, K Saito

    CHEMISTRY LETTERS   33 ( 10 )   1286 - 1287   2004.10

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    DOI: 10.1246/cl.2004.1286

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  • Stepwise selective oxidation of tris(2-(diphenylphosphino)ethyl)phosphine on thiolato palladium(II) complexes Reviewed

    S Aizawa, T Kawamoto, K Saito

    INORGANICA CHIMICA ACTA   357 ( 7 )   2191 - 2194   2004.5

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    DOI: 10.1016/j.ica.2003.11.041

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MISC

  • Niobium-based oxide semiconductor nanowires possessing superior photocatalytic properties

    Kenji Saito, Akihiko Kudo

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   240   2010.8

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  • Non-destructive extraction of semiconducting single walled carbon nanotubes by wrapping with flexible porphyrin polypeptides and the supramolecular photodynamics

    Kenji Saito, Vincent Troiani, Hongjin Qiu, Nathalie Solladié, Takao Sakata, Hirotaro Mori, Yasuyuki Arakr, Osamu Ito, Shunichi Fukuzumi

    ECS Transactions   2 ( 12 )   157 - 165   2007

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    DOI: 10.1149/1.2408962

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Awards

  • Excellent Presentation Award

    2008  

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  • 優秀講演賞(学術)

    2008   日本化学会  

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    Country:Japan

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Research Projects

  • Synthesis of porous crystal catalyst of d0 transition metal oxide

    Grant number:19K05203

    2019.4 - 2022.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    Saito Kenji

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    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    A particular metal ion included as a constituent in a nonporous inorganic solid was chemically substituted with the smallest proton for forging a new path to obtain a new porous functional crystal. Cu5Ta11O30, one of two synthetic precursors, was subjected to the solvothermal treatment to form Cu-free H5Ta11O30. The hydroxyl groups on its surface are suggested to be involved in hydrogen generation observed when heating in a vacuum. As the H-D exchange of the group occurs in D2O, H5Ta11O30 will be the catalyst for D2 generation. On the other hand, we synthesized another functional solid with larger crystalline pores, K1-xHxNb5O13, which is obtained by substituting the K site of KNb5O13 with proton via the Ag-substituted intermediate. The porosity and photocatalytic ability were assessed.

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  • Nonclassical crystal growth of transition metal phosphide

    Grant number:16K04885

    2016.4 - 2019.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    Saito Kenji

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    Grant amount:\4810000 ( Direct Cost: \3700000 、 Indirect Cost:\1110000 )

    Objective of this research project was to develop a liquid-phase synthesis method of molybdenum phosphide (MoP) that is known to show excellent catalytic performance of electrochemical hydrogen evolution reaction (E-HER), through non-classical crystal growth mechanism (oriented aggregation) in which small crystals are combined together to grow larger crystals. By screening the reactants and the synthetic precursors, MoP was obtained by a liquid-phase method eventually. The particle size of the MoP was ca. 200 nm, which is much smaller than that prepared from solid state reaction (ca. 10 μm). The MoP obtained shows smaller overpotential for E-HER than the bulky counterpart.

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  • Design of high-perfomance nanophotocatalyst material through intercrystal self-assembly

    Grant number:26790012

    2014.4 - 2016.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Young Scientists (B)

    Awarding organization:Japan Society for the Promotion of Science

    SAITO Kenji

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    Oriented aggregation, known as a non-classical pathway for crystal growth mechanism, rarely occurs as single mechanism. The previous work demonstrated the possibility by controlling dissolution rates of the starting materials, and which afforded a high-quality inorganic crystal. Thus we tried to found the guiding principle for routine use. The kinetic control of the reaction system invoked single crystallization of NiMoO4-0.75H2O nanowire, which showed higher capacitor performance than that for conventional NiMoO4 hydrate nanowire, through the oriented aggregation.

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  • ナノ細線状半導体光触媒システムの開発

    Grant number:09152873

    2009 - 2012

    Research category:戦略的な研究開発の推進/戦略的創造研究推進事業/さきがけ

    Awarding organization:科学技術振興機構

    齊藤 健二

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    本研究では、水分解または犠牲試薬存在下で水素や酸素生成反応に活性を示す粉末光触媒の高機能化法の確立を目指し、金属錯体を基盤とした合成法を適用して種々の構成元素からなるナノ細線状半導体光触媒群を創製します。本合成法の汎用性を明らかにするだけでなく、ナノワイヤーの高次組織化過程を理解することで、光触媒反応に有利な機能の創発を実現します。

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  • Construction of electron mediating element-combined water splittingsystem that mimics natural photosynthesis

    Grant number:20750113

    2008 - 2009

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Young Scientists (B)

    Awarding organization:Japan Society for the Promotion of Science

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    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    Z scheme water splitting was examined by the combination of H_2 and O_2 evolving photocatalysts of Ru/SrTiO_3 : Rh and BiVO_4, respectively, in the presence of a water-soluble copper(II) complex as an electron mediator at neutral pH under visible light irradiation, to afford H_2 and O_2 with relatively high efficiency. To enhance the photocatalytic property, nanowire-shaped semiconductor photocatalyst was also developed by the reaction of the niobium complex and trioctylamine, because the nanowire generally possesses high surface area, leading to the enhanced adsorption of the mediator on the photocatalyst. Sodium niobate nanowire was employed as a photocatalyst for overall water splitting under UV light irrafiation to show photocatalytic activity for the first time.

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  • 水を還元剤とした硝酸イオンの還元反応に活性な光触媒の開発

    Grant number:20037061

    2008 - 2009

    System name:科学研究費助成事業

    Research category:特定領域研究

    Awarding organization:日本学術振興会

    工藤 昭彦, 齊藤 健二

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    Grant amount:\3800000 ( Direct Cost: \3800000 )

    ZnIn_2S_4(x=1)光触媒を用い,還元剤として機能するホスフィン酸ナトリウム存在下での硝酸イオンの還元反応における助触媒効果を検討した.助触媒未担持でも本還元反応が進行し,還元生成物として亜硝酸およびアンモニウムイオンが得られた.生成量は亜硝酸イオンの方が多かった.ホスフィン酸ナトリウムを還元剤としてPdおよびNi助触媒を光電着法で触媒上に担持したところ,硝酸イオンの還元に使われた反応電子量は未担持に比べて飛躍的に向上し,Pdでは亜硝酸が,Niではアンモニウムイオンの生成量が多くなった.そこで両助触媒の共担持効果を調べたところ,亜硝酸イオンは得られず,アンモニウムイオンの生成量が向上した.これは,Pd上で硝酸イオンから亜硝酸イオンへの還元反応が優位に進行し,その亜硝酸イオンが近傍のNi上で効率よくアンモニウムイオンへ変換されたためであると考えられる.硝酸イオンの還元反応は,水の還元反応と競争的に進行しているが,全ての系において水の還元よりも硝酸イオンの還元反応の方が優位に進行していることは特筆すべき点である.
    次に,NiとPdを共担持したZnGa_xIn_<2(1-x)>S_4光触媒を用いた硝酸イオンの還元反応におけるGaの置換量(x)依存性を調べた.その結果,亜硝酸イオンは全ての組成において生成せず,アンモニウムイオンの生成量は光触媒のバンドギャップの狭窄化,つまり吸収光量の増加に伴って単調に増加し,ZnIn_2S_4組成で最高活性を示した,以上のように,当研究室オリジナルの金属酸化物および硫化物光触媒を用いることにより,可視光照射下における硝酸イオンの還元反応が進行することを明らかにした.

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  • 二酸化炭素還元のための可視光応答性光触媒の開発

    Grant number:19028060

    2007

    System name:科学研究費助成事業

    Research category:特定領域研究

    Awarding organization:日本学術振興会

    工藤 昭彦, 斎藤 健二

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    Grant amount:\2000000 ( Direct Cost: \2000000 )

    NiをドーピングしたZnS光触媒が,正孔捕捉剤存在下,可視光照射下でCO_2還元反応に活性を示す光触媒であることを初めて見いだした。NiドーピングZnS光触媒は,可視光照射下でほぼ定常的にH_2とHCOOHを生成した。一般に,光触媒反応ではPtなど助触媒が必要であるが,この反応において助触媒は不要であり,光触媒自身が活性点を有していることが特徴である。カットオフフィルターを用いたNiドーピングZnSによるHCOOH生成反応の波長依存性より,HCOOHが生成し始める波長と吸収スペクトルの立ち上がりが一致した。このことから,NiドーピングZnSによるCO_2還元反応は,Niのドナー準位から伝導帯へのエネルギーギャップ励起によって進行していることが明らかとなった。一方,(ZnGa_2S_4)-(Znln_2S_4)複合体が,正孔捕捉剤存在下,可視光照射下でのCO_2還元反応に活性な光触媒であることを初めて見いだした。主なCO_2還元生成物として,COとHCOOHの両方が得られた。CO_2還元反応の活性は用いる正孔捕捉剤の種類に大きく依存しており,NaPH_20_2を用いた場合に最も高い活性を示した。また,基盤となるZnIn_2S_4ではほとんどCO_2還元反応が進行しないが,それにGaを10%置換したZnGa_<0.2>In_<1.8><S_4>を用いた場合は,CO_2還元反応の活性が飛躍的に向上した。Znln_2S_4にGaが置換されることで,CO_2還元反応に対するドライビングフォースが増加し,活性点が形成されたため活性が飛躍的に向上したと考えられる。

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Teaching Experience

  • リメディアル演習

    2024
    Institution name:新潟大学

  • 触媒化学

    2023
    Institution name:新潟大学

  • 統合化学入門

    2023
    Institution name:新潟大学

  • インターンシップ

    2023
    Institution name:新潟大学

  • 機能材料工学実験II

    2021
    Institution name:新潟大学

  • 論文輪講I

    2020
    -
    2024
    Institution name:新潟大学

  • 技術英語I

    2020
    -
    2024
    Institution name:新潟大学

  • 論文輪講II

    2020
    -
    2024
    Institution name:新潟大学

  • 技術英語II

    2020
    -
    2024
    Institution name:新潟大学

  • 材料科学実験II

    2019
    Institution name:新潟大学

  • ナノ材料化学特論

    2018
    Institution name:新潟大学

  • 材料科学概論

    2018
    Institution name:新潟大学

  • 工学リテラシー入門(化学材料分野)

    2018
    Institution name:新潟大学

  • 化学実験

    2018
    Institution name:新潟大学

  • 応用無機材料化学

    2017
    Institution name:新潟大学

  • 卒業研究

    2017
    Institution name:新潟大学

  • 卒業研修

    2017
    Institution name:新潟大学

  • 技術英語

    2017
    -
    2022
    Institution name:新潟大学

  • 電気化学

    2017
    -
    2022
    Institution name:新潟大学

  • 論文輪講

    2017
    -
    2022
    Institution name:新潟大学

  • 機能材料工学実験I

    2017
    Institution name:新潟大学

  • 基礎無機化学

    2017
    Institution name:新潟大学

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