Photophysical and photocatalytic properties of SrTiO3 doped with Cr cations on different sites

被引:328
作者
Wang, Defa
Ye, Jinhua
Kako, Tetsuya
Kimura, Takashi
机构
[1] NIMS, Photocatalyt Mat Ctr & Anal Stn, Tsukuba, Ibaraki 3050047, Japan
[2] JST, PREST, Kawaguchi, Saitama 3320012, Japan
关键词
D O I
10.1021/jp062487p
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Usually, SrTiO3 monodoped with Cr cations at the Ti4+ site hardly shows visible light photocatalytic activity. Revealing the origin of this issue is important for us to find an alternative approach to make SrTiO3 active under visible light irradiation. In this paper, two Cr-doped SrTiO3-(Sr0.95Cr0.05)TiO3 and Sr(Ti0.95Cr0.05)O-3-were synthesized by a conventional solid-state reaction method, and their photophysical and photocatalytic properties were studied comparatively. It was found that both (Sr0.95Cr0.05) TiO3 and Sr(Ti0.95Cr0.05)O-3 showed considerable absorption to visible light. However, their photocatalytic activities for H-2 evolution from aqueous methanol solution under visible light irradiation were significantly different: the H-2 evolution rate over (Sr0.95Cr0.05) TiO3 (similar to 21 mu mol/h) was more than 100 times that over Sr(Ti0.95Cr0.05)O-3 (similar to 0.2 Amol/h). X-ray photoelectron spectroscopy analysis results revealed that the Cr cations doped at the Sr2+ site were all trivalent state (Cr3+), while those doped at the Ti4+ site were mixed valent states (Cr3+ and Cr6+). The different photocatalytic activities of H-2 evolution are supposed to closely relate to the different valent states of Cr doped at different sites (Sr2+ or Ti4+) in SrTiO3. Possible electronic structures of (Sr0.95Cr0.05)TiO3 and Sr(Ti0.95Cr0.05)O-3 were proposed in relation to their photophysical and photocatalytic properties.
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收藏
页码:15824 / 15830
页数:7
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