TaON and Ta3N5 as new visible light driven photocatalysts

被引：326
|
作者：
Hara, M
Hitoki, G
Takata, T
Kondo, JN
Kobayashi, H
Domen, K
机构：
[1] Tokyo Inst Technol, Chem Resources Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
[2] Kurashiki Univ Sci & Arts, Coll Sci & Ind Technol, Dept Chem Technol, Kurashiki, Okayama 7128505, Japan
来源：
CATALYSIS TODAY | 2003年 / 78卷 / 1-4期
关键词：
TaON; Ta3N5; photocatalysts;
D O I：
10.1016/S0920-5861(02)00354-1
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
TaON and Ta3N5, Ta5+-based (oxy)nitrides, were studied as visible light driven photocatalysts. Under visible light irradiation (lambda greater than or equal to 420 nm), the (oxy)nitrides oxidize water to O-2 and reduce H+ to H-2 in the presence of sacrificial reagents (Ag+ and methanol). TaON oxidizes water into O-2 efficiently, with a maximum quantum yield of 10%. The photocatalytic reactions proceed via the bandgap transitions (E-g, 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. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：555 / 560
页数：6
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