Photostability study of nanoporous TiO2 film electrodes in different pH solutions

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	Photostability study of nanoporous TiO2 film electrodes in different pH solutions
	J. L. Cao; Z. C. Wu; H. Q. Zhang
	2006
发表期刊	Journal of Electroanalytical Chemistry
ISSN	0022-0728
卷号	595 期号:1 页码:71-77
摘要	The nanoporous TiO2 film electrodes have been prepared by a sol-gel deposition process. The photostability of the electrodes at different pH values have been studied. The results show that the photostability of the electrodes decreases with increasing solution pH, especially in strong basic solutions without methanol. The increase of photocurrent and the decrease of onset potential with solution pH can be attributed to the increase of the adsorbed HO- ions. The adsorbed HO- ions act not only as electron donors but as also potential-determining ions on TiO2 film surface. However, in basic solutions the adsorbed O2- anions on TiO2 surface will form as pH value increases. The reaction of holes to the adsorbed O2- anions produces active O- anions. In the solutions without enough methanol the products of active O- anions oxidize Ti3+ to Ti4+ on TiO2 film surface and subsurface to occupy gradually the oxygen vacancies as electron donors. This results in the nanoporous TiO2, film electrodes being unstable with increasing pH. (c) 2006 Elsevier B.V. All rights reserved.
部门归属	zhejiang univ, dept environm engn, hangzhou 310027, peoples r china. zhejiang univ, dept chem, hangzhou 310027, peoples r china. chinese acad sci, met res inst, state key lab corros & protect met, shenyang 110016, peoples r china.;cao, jl (reprint author), zhejiang univ, dept environm engn, hangzhou 310027, peoples r china;shjzhcaojl@163.com
关键词	Photostability Nanoporous Tio2 Film Photoelectrochemistry Titanium-dioxide Photocatalytic Hydrogenation Environmental Applications Nanocrystalline Tio2 Aqueous Suspensions Solar-cells Surface Water Degradation Irradiation
URL	查看原文
WOS记录号	WOS:000240354800008
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34134
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. L. Cao,Z. C. Wu,H. Q. Zhang. Photostability study of nanoporous TiO2 film electrodes in different pH solutions[J]. Journal of Electroanalytical Chemistry,2006,595(1):71-77.
APA	J. L. Cao,Z. C. Wu,&H. Q. Zhang.(2006).Photostability study of nanoporous TiO2 film electrodes in different pH solutions.Journal of Electroanalytical Chemistry,595(1),71-77.
MLA	J. L. Cao,et al."Photostability study of nanoporous TiO2 film electrodes in different pH solutions".Journal of Electroanalytical Chemistry 595.1(2006):71-77.