Water Oxidation Using a Particulate BaZrO3-BaTaO2N Solid-Solution Photocatalyst That Operates under a Wide Range of Visible Light

Authors

  • Prof. Dr. Kazuhiko Maeda,

    Corresponding author
    1. Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8550 (Japan)
    2. Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012 (Japan)
    • Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8550 (Japan)
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  • Prof. Dr. Kazunari Domen

    Corresponding author
    1. Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
    • Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
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  • This work was supported by the PRESTO/JST program “Chemical Conversion of Light Energy”. The authors would like thank Dr. D. Lu (Tokyo Institute of Technology (Japan)) for taking the TEM images. The authors would also like to acknowledge the Grant-in-Aid for Specially Promoted Research (No. 23000009) of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, and Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST). One of the authors (K.M.) thanks the Nippon Sheet Glass Foundation for Materials Science and Engineering for funding support.

Abstract

original image

Tripping the light fantastic: Despite small band gap energies (1.7–1.8 eV), BaZrO3-BaTaO2N solid solutions (Zr/Ta≤0.1) are capable of photocatalyzing both water oxidation and reduction even under irradiation above 660 nm. Solar water splitting to form H2 and O2 was also demonstrated using a photoelectrochemical cell consisting of a BaZrO3–BaTaO2N solid solution as an anode and a Pt wire cathode.

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