ESR Study on the Reversible Electron Transfer from O22- to Ti4+ on TiO2 Nanoparticles Induced by Visible-Light Illumination

被引：28
|
作者：
Komaguchi, Kenji [1 ]
Maruoka, Takanori [1 ]
Nakano, Haruka [1 ]
Imae, Ichiro [1 ]
Ooyama, Yousuke [1 ]
Harima, Yutaka [1 ]
机构：
[1] Hiroshima Univ, Grad Sch Engn, Dept Appl Chem, Higashihiroshima 7398527, Japan
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 04期
基金：
日本学术振兴会;
关键词：
MOLECULAR-OXYGEN; PHOTOCATALYTIC DEGRADATION; TIO2(110) SURFACE; PARAMAGNETIC-RES; ANATASE SURFACE; O-2; ADSORPTION; PHOTOREDUCTION; DISSOCIATION; TEMPERATURE;
D O I：
10.1021/jp809851b
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：
Photoinduced electron transfer reactions of O-2 molecules adsorbed on the H-2-reduced surface of TiO2 (rutile) nanoparticles have been studied at 77 K by in situ ESR spectroscopy. Upon visible-light illumination, ESR signals due to O-2(-) (g(z) = 2.020) and Ti3+ appeared and then returned to the original ones by raising the temperature in the dark. The numbers of O-2(-) and Ti3+ ions formed by illumination were equal, suggesting that a reversible electron transfer between peroxo O-2(2-) species and the adjacent Ti4+ ion occurs by sub-band gap illumination of TiO2.
引用
收藏
页码：1160 / 1163
页数：4
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