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Received September 24, 2001
Accepted September 30, 2001
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New Aspects of Heterogeneous Photocatalysts for Water Decomposition
Kazunari Domen†
Michikazu Hara
Junko N. Kondo
Tsuyoshi Takata
Akihiko Kudo1
Hisayoshi Kobayashi2
Yasunobu Inoue3
Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan 1Department of Applied Chemistry, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjyuku-ku, Tokyo 162-8601, Japan 2Department of Chemcial Technolgy, College of Science and Industrial Technology, Kurashiki University and the Arts, 2640 Nishinoura, Tsurajima-cho, Kurashiki-shi, Okayama 712-8505, Japan 3Department of Chemistry, Nagaoka University of Technology, Nagaoka 940-2188, Japan
kdomen@res.titech.ac.jp
Korean Journal of Chemical Engineering, November 2001, 18(6), 862-866(5), 10.1007/BF02705609
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Abstract
\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 d(10) 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 O-2 evolutions under visible light irradiation (≤ 600 nm). The electronic structures of these photocatalysts are also discussed based on DFT calculation.
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References
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Takahara Y, Kondo JN, Takata T, Lu D, Domen K, Chem. Mater., 13, 1194 (2000)
Inoue Y, Kubokawa T, Sato K, J. Phys. Chem., 95, 4059 (1991)
Kato H, Kudo A, Catal. Lett., 58(2-3), 153 (1999)
Kudo A, Kato H, Nakagawa S, J. Phys. Chem. B, 104(3), 571 (2000)
Kudo A, Kato H, Chem. Phys. Lett., 331, 373 (2000)
Kondo JN, Takahara Y, Takata T, Lu D, Domen K, Chem. Mater., 13, 1200 (2000)
Lee B, Kondo JN, Lu D, Domen K, Stud. Surf. Sci. Catal., 137, 7 (2001)
Lee B, Kondo JN, Lu D, Domen K, "Single Crystal Particles of Mesoporous Transition Metal Oxide with Wormhole Structure," Chem. Commun., Submitted
Sato J, Saito N, Nishiyama H, Inoue Y, J. Phys. Chem. B, 105(26), 6061 (2001)
Sayama K, Arakawa H, J. Photochem. Photobiol. A-Chem., 77, 243 (1994)
Scaife DE, Sol. Energy, 25, 41 (1980)
Takahara Y, Kondo JN, Takata T, Lu D, Domen K, Chem. Mater., 13, 1194 (2000)
