Kyushu University Academic Staff Educational and Research Activities Database
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Kosei Yamauchi Last modified date:2021.06.01

Assistant Professor / Inorganic and Analytical Chemistry
Department of Chemistry
Faculty of Sciences

Graduate School
Undergraduate School

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Homepage of Coordination Chemistry Laboratory .
Academic Degree
Dr. Sci.
Field of Specialization
Coordination Chemistry
Research Interests
  • Studies on the visible-light-induced water-splitting reactions catalyzed by coordination compounds
    keyword : H2-evolving catalyst, O2-evolving catalyst, Water-splitting, Hydrogen energy, Metal complexes
Academic Activities
1. Kosei Yamauchi, Saya Tanaka, Masayuki Kobayashi, Chettiyam Veettil Suneesh, and Ken Sakai, Molecular Systems Driving Photochemical and Thermal H2 Production from Water, Kyushu University Global-COE program Science for Molecular Systems Journal, 2012, 5, 52-55., 2012.03.
1. Keita Koshiba, Kosei Yamauchi, Ken Sakai, A Nickel Dithiolate Water Reduction Catalyst Providing Ligand-Based Proton-Coupled Electron-Transfer Pathways, Angewandte Chemie - International Edition, 10.1002/anie.201700927, 56, 15, 4247-4251, 2017.03, A nickel pyrazinedithiolate ([Ni(dcpdt)2]2−; dcpdt=5,6-dicyanopyrazine-2,3-dithiolate), bearing a NiS4 core similar to the active center of [NiFe] hydrogenase, is shown to serve as an efficient molecular catalyst for the hydrogen evolution reaction (HER). This catalyst shows effectively low overpotentials for HER (330–400 mV at pH 4–6). Moreover, the turnover number of catalysis reaches 20000 over the 24 h electrolysis with a high Faradaic efficiency, 92–100 %. The electrochemical and DFT studies reveal that diprotonated one-electron-reduced species forms at pH < 6.4 via ligand-based proton-coupled electron-transfer (PCET) pathways, leading to electrocatalytic HER without applying the highly negative potential required to generate low-valent nickel intermediates. This is the first example of catalysts exhibiting such behavior..
1. Kosei Yamauchi, Ken Sakai, PHOTOCHEMICAL HYDROGEN PRODUCTION FROM WATER CATALYZED BY ROBUST MOLECULAR CATALYSTS, 41st International Conference on Coordination Chemistry (ICCC41), 2014.07.
2. Kosei Yamauchi, Ken Sakai, Photochemical Hydrogen Production from Water Promoted by Robust Platinum(II) Molecular Catalysts, 1st International Symposium on Chemical Energy Conversion Processes (ISCECP-1), 2013.07.
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Membership in Academic Society
  • The Chemical Society of Japan (CSJ)
  • Japan Society of Coordination Chemistry
  • The Photofunctional Complexes Research Association, Japan