物理化学学报 >> 2002, Vol. 18 >> Issue (01): 21-25.doi: 10.3866/PKU.WHXB20020105

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强度调制光电流谱研究TiO2悬浮体系光催化机理

尹峰;林原;林瑞峰;肖绪瑞   

  1. 中国科学院化学研究所分子科学中心,北京　100101
  • 收稿日期:2001-06-28 修回日期:2001-08-31 发布日期:2002-01-15
  • 通讯作者: 肖绪瑞 E-mail:G211@IPC.AC.cn

Photocatalytic Mechanism Studies of TiO2 Particulate Suspension by IntensityModulation Photocurrent Spectroscopy

Yin Feng;Lin Yuan;Lin Rui-Feng;Xiao Xu-Rui   

  1. Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing　100080
  • Received:2001-06-28 Revised:2001-08-31 Published:2002-01-15
  • Contact: Xiao Xu-Rui E-mail:G211@IPC.AC.cn

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摘要： 用强度调制光电流谱在光电化学电池中研究TiO2粒子悬浮液体系中的光催化反应机理,将强度按正弦变化的调制光照射TiO2粒子悬浮液,产生随频率变化的光电流响应,收集在Pt电极上,得到了光电流响应复数平面图,其上半圆和下半圆分别代表光生空穴和光生电子的阴极还原和阳极氧化反应过程.根据阴极和阳极光电流的幅度及上下半圆的特征频率分析讨论了光催化反应的机理及外加电压和H2O2添加物的影响.

关键词: 强度调制光电流谱, TiO2粒子悬浮液光催化, 光生电荷, 阴极电流, 　阳极电流

Abstract: The mechanism of the photocatalytic processes of TiO2 particulate suspension was studied in a PEC cell by using IntensityModulated Photocurrent Spectroscopy (IMPS). Collecting the frequency dependent photocurrent response from the TiO2 particulate suspension under modulated irradiation on a Pt electrode, a complex plane of IMPS response was obtained. The upper and lower semicircles represent the cathodic reduction and anodic oxidization reaction processes of photogenerated holes and electrons, respectively. The photocatalytic mechanism and the effects of applied potentials and the addition of H2O2 were discussed in terms of the amplitude of cathodic and anodic photocurrents and the characteristic frequencies of upper and lower semicircles.

Key words: IntensityModulated Photocurrent Spectroscopy(IMPS), 　 Photocatalysis of TiO2 particulate suspension, Photogenerated charges, Anodic photocurrents, Cathodic photocurrents