The pH dependence of OH radical formation in photo-electrochemical water oxidation with rutile TiO2 single crystals

被引:93
作者
Nakabayashi, Yukihiro [1 ]
Nosaka, Yoshio [1 ]
机构
[1] Nagaoka Univ Technol, Dept Mat Sci & Technol, Nagaoka, Niigata 9402188, Japan
关键词
VISIBLE-LIGHT; PHOTOCATALYTIC ACTIVITY; OXYGEN PHOTOEVOLUTION; ATOMICALLY SMOOTH; MECHANISM; PHOTOLUMINESCENCE; PHOTOOXIDATION; REACTIVITY; SPECTRA; ANATASE;
D O I
10.1039/c5cp04531b
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
It has been believed that photocatalytic oxidation in water proceeds with the reaction of OH radicals generated on the photocatalysts. To explore the actual contribution of OH radicals to photocatalytic oxidation, OH radicals were detected by fluorescence probe method in photoelectrolysis with rutile TiO2 of (100) and (110) facets. The effect of hydrogen peroxide on the OH radical formation at pH 6.7 was investigated to confirm the relevant intermediate which was suggested in our previous report for water oxidation. In alkaline solutions at pH 9.6 and 12.5, the current efficiencies of OH radical formation were 0.01-0.05%, which are far smaller than those at pH 6.7 (0.2-0.6%) due to the deprotonation of the reaction intermediate as confirmed by FT-IR measurements. These experimental results support a plausible reaction mechanism that the surface Ti-O-O-Ti structure is an intermediate of the water oxidation process, by which mechanism the O-2 production becomes favorable in alkaline solution.
引用
收藏
页码:30570 / 30576
页数:7
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