TiO2薄膜光电极能带结构和催化活性的初探

doi:10.7517/j.issn.1674-0475.2004.05.327

影像科学与光化学 ›› 2004, Vol. 22 ›› Issue (5): 327-332.DOI: 10.7517/j.issn.1674-0475.2004.05.327

TiO₂薄膜光电极能带结构和催化活性的初探

孔海霞, 孙彦平, 武爱莲

太原理工大学, 洁净化工研究所, 山西, 太原, 030024

收稿日期:2004-04-16 修回日期:2004-04-30 出版日期:2004-09-23 发布日期:2004-09-23
通讯作者: 孙彦平,E-mail:ypsun@tyut.edu.cn.
基金资助:
国家自然科学基金(29776032);山西省自然科学基金(971013).

Preliminary Study on Band Structure of TiO₂ Thin Photoelectrode and Catalytic Activity

KONG Hai-xia, SUN Yan-ping, WU Ai-lian

Chemical Engineering Department, Taiyuan University of Technology, Taiyuan 030024, Shanxi, P. R. China

Received:2004-04-16 Revised:2004-04-30 Online:2004-09-23 Published:2004-09-23

摘要/Abstract

摘要： 以阳极氧化法制得的TiO₂薄膜光电极为工作电极,铂环为对电极,饱和甘汞电极为参比电极,组成光电催化降解苯酚体系.运用电化学阻抗图谱(EIS),测得光电催化过程中TiO₂薄膜光电极的空间电荷层电容,计算出半导体能带结构参数——空间电荷层宽度W.结果证明:当空间电荷层宽度W随阳极偏压增加而增大时,TiO₂薄膜电极光催化活性提高;当其等于薄膜厚度时,光催化活性最好,此时出现最佳偏压值;继续增加偏压,活性反而有所下降.

关键词: TiO₂薄膜, 半导体光电极, 电化学阻抗图谱, 苯酚降解

Abstract: A three-electrode system composed of TiO₂ photoelectrode as the working electrode,Pt ring as the counter electrode and saturated calomel electrode (SCE) as the reference electrode was used for the photoelectrocatalytic degradation of phenol.The TiO₂ thin film photoelectrode was made by anodizing.During the photoelectrocatalytic process,Electrochemical Impedance Spectroscopy (EIS) was applied to measure the capacitance of space charge layer in the TiO₂ semiconductor photoelectrode,and to calculate the band structure parameter-the width W of space charge layer.The results show that photocatalytic activity of TiO₂ electrode is improved when the width broadens with the bias increasing; the activity reaches best when the width is nearly equivalent to the thickness of TiO₂ thin film,then the optimal value of the bias appears; the activity somewhat decreases when the bias is beyond the optimal value.

Key words: TiO₂ thin film, semiconductor photoelectrode, electrochemical impedance spectroscopy, phenol degradation

中图分类号:

孔海霞, 孙彦平, 武爱莲. TiO₂薄膜光电极能带结构和催化活性的初探[J]. 影像科学与光化学, 2004, 22(5): 327-332.

KONG Hai-xia, SUN Yan-ping, WU Ai-lian. Preliminary Study on Band Structure of TiO₂ Thin Photoelectrode and Catalytic Activity[J]. Imaging Science and Photochemistry, 2004, 22(5): 327-332.

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TiO₂薄膜光电极能带结构和催化活性的初探

Preliminary Study on Band Structure of TiO₂ Thin Photoelectrode and Catalytic Activity

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