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Citation: Cao Jiang-Lin, Leng Wen-Hua, Zhang Jian-Qing, Cao Chu-Nan. Adsorption Behavior and Photooxidation Kinetics of OH－ at TiO₂ Thin Film Electrodes[J]. Acta Physico-Chimica Sinica, ;2004, 20(07): 735-739. doi: 10.3866/PKU.WHXB20040714 shu

Adsorption Behavior and Photooxidation Kinetics of OH－ at TiO₂ Thin Film Electrodes

1.
Department of Chemistry, Zhejiang University, Hangzhou　310027

Received Date: 9 December 2003
Available Online: 15 July 2004

The adsorption behavior and photooxidation kinetics of OH－ at TiO2 thin film electrodes in solution of alcohols have been studied by electrochemical measurements. The results show that the adsorption model of OH－ on TiO2 surface corresponds to the Langmuir isotherm and under high enough applied bias potential the photooxidation kinetics can be described by Langmuir-Hinshelwood expression. Hydroxide ions are regarded to be the reactant with photogenerated holes and adsorbed water could not be captured by the holes and, consequently, the photocurrent is proportional to the density of OH－ adsorbed on TiO2 surface under the condition of high enough light intensity. In solution with high content of alcohols, the recombining reaction between radical and photogenerating electron can hardly occur, where the rate-limiting step is the formation of photo-driven OH• radical.
- Hydroxide ion;TiO₂ thin film;Photooxidation kinetic;Langmuir isotherm
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Adsorption Behavior and Photooxidation Kinetics of OH－ at TiO2 Thin Film Electrodes

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通讯作者: 陈斌, bchen63@163.com

Adsorption Behavior and Photooxidation Kinetics of OH－ at TiO₂ Thin Film Electrodes