物理化学学报 >> 2002, Vol. 18 >> Issue (11): 1014-1017.doi: 10.3866/PKU.WHXB20021111

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紫外光照下纳米TiO2电极的电化学行为

崔晓莉;江志裕   

  1. 复旦大学化学系，复旦大学材料科学系，上海　200433
  • 收稿日期:2002-02-23 修回日期:2002-06-25 发布日期:2002-11-15
  • 通讯作者: 江志裕 E-mail:zyjiang@fudan.ac.cn

Electrochemical Behavior of ITO/TiO2 Electrode under UV Illumination

Cui Xiao-Li;Jiang Zhi-Yu   

  1. Department of Chemistry,Department of Materials Science, Fudan University, Shanghai　200433
  • Received:2002-02-23 Revised:2002-06-25 Published:2002-11-15
  • Contact: Jiang Zhi-Yu E-mail:zyjiang@fudan.ac.cn

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摘要： 通过电沉积方法制备了纳米TiO2薄膜电极，应用循环伏安和交流阻抗技术研究了TiO2电极在253.7 nm的紫外光照射下的电化学行为.结果表明, TiO2薄膜电极的循环伏安图在＋0.15 V处出现新的氧化峰,交流阻抗谱的半圆明显减小，电极的开路电位在有光和无光的情况下呈现规律变化.实验证实在紫外光照射下电极表面有新物种Ti3＋生成，但光生Ti3＋不稳定.

关键词: TiO2薄膜电极, 紫外光, 循环伏安, 交流阻抗

Abstract: The electrode of nanothin film of TiO2 was prepared by electrodeposition method on ITO surface. Electrochemical behavior of ITO/TiO2 electrode under UV illumination was investigated using the methods of cyclic voltammetry and AC impedance spectroscopy. A new oxidative peak appeared at 0.15 V when the TiO2 electrode was illuminated less than 253.7 nm lights. It belongs to a new species of photo induced Ti3＋. The complex-plane impedance plots for ITO/TiO2 electrode in a solution containing Na2SO4 at open circuit potential exhibit semicircular shapes. The apparent resistance decreased when the electrode was irradiated by UV light. It is confirmed that a new species was produced when the electrode of nanofilm TiO2 under 253.7 nm light irradiation. The open-circuit potential of an electro deposition TiO2 film electrode varied regularly with light on and off. This result shows that the TiO2 electrode has the typical characteristics of n-type semiconductors. It also indicates that photo-induced Ti3＋ is not stable in the solution.

Key words: TiO2 electrode, UV light, Cyclic voltammetry, AC impedance spectroscopy