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TaON and Ta3N5 as new visible light driven photocatalysts |
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| Authors: | Michikazu Hara Go Hitoki Tsuyoshi Takata Junko N. Kondo Hisayoshi Kobayashi Kazunari Domen |
| Affiliation: | a Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan b Department of Chemical Technology, College of Science and Industrial Technology, Kurashiki University of Science and the Arts, 2640 Nishinoura, Tsurajima-cho, Kurashiki 712-8505, Japan c Core Research for Evolutional Science and Technology, Japan Science and Technology Co. (CREST, JST), 2-1-13 Higashi-ueno, Daito-ku 110-0015, Japan |
| Abstract: | TaON and Ta3N5, Ta5+-based (oxy)nitrides, were studied as visible light driven photocatalysts. Under visible light irradiation (λ≥420 nm), the (oxy)nitrides oxidize water to O2 and reduce H+ to H2 in the presence of sacrificial reagents (Ag+ and methanol). TaON oxidizes water into O2 efficiently, with a maximum quantum yield of 10%. The photocatalytic reactions proceed via the bandgap transitions (Eg, TaON: 2.5 eV, Ta3N5: 2.1 eV) without any noticeable degradation of the catalysts. The small energy gaps of TaON and Ta3N5 are ascribed to the valence band structures consisting of N 2p orbitals. |
| Keywords: | TaON Ta3N5 Photocatalysts |
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