New aspects of heterogeneous photocatalysts for water decomposition |
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| Authors: | Kazunari Domen Michikazu Hara Junko N Kondo Tsuyoshi Takata Akihiko Kudo Hisayoshi Kobayashi Yasunobu Inoue |
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| Affiliation: | (1) Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, 226-8503 Yokohama, Japan;(2) Department of Applied Chemistry, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjyuku-ku, 162-8601 Tokyo, Japan;(3) Department of Chemical Technology, College of Science and Industrial Technology, Kurashiki University of Science and the Arts, 2640 Nishinoura, Tsurajima-cho, Kurashiki-shi, 712-8505 Okayama, Japan;(4) Department of Chemistry, Nagaoka University of Technology, 940-2188 Nagaoka, Japan |
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| Abstract: | Several new photocatalysts for overall water splitting are described. Under UV light irradiation (270 nm), La-doped NaTaO3 modified with NiO decomposed water into H2 and O2 with extremely high quantum efficiency. Under an optimized condition, the apparent quantum efficiency, which was estimated
with numbers of irradiated photons and evolved H2 molecules, reached 56%. New stable photocatalytic materials containing elements with d10 electronic configuration such as In3+ Sn4+ and Sb5+ were developed for overall water splitting. Some mesoporous oxides were proved to be effective photocatalysts. (Oxy)nitrides
of some early transition metals, i.e., Ta, Nb and Ti, were found to be stable materials having potentials for H2 and O2 evolutions under visible light irradiation (⪯600 nm). The electronic structures of these photocatalysts are also discussed
based on DFT calculation. |
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| Keywords: | Photocatalytic Overall Water Splitting d0 and d10-Metal Oxides Mesoporous Materials (Oxy)nitrides DFT Calculation |
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