物理化学学报 >> 2001, Vol. 17 >> Issue (04): 372-376.doi: 10.3866/PKU.WHXB20010419

研究简报 上一篇    下一篇

外在因素对TiO2膜电极/溶液界面CPE行为的影响

郭源;李永军;夏熙;张校刚;何茂霞   

  1. 新疆大学应用化学研究所,乌鲁木齐 830046
  • 收稿日期:2000-08-14 修回日期:2000-12-11 发布日期:2001-04-15
  • 通讯作者: 郭源 E-mail:guoyuan@xju.edu.cn

Effect of Extrinsic Factors on the CPE Behavior of Film TiO2 Electrode

Guo Yuan;Li Yong-Jun;Xia Xi;Zhang Xiao-Gang;He Mao-Xia   

  1. Institute of Applied Chemistry, Xinjiang University, Urumqi 830046
  • Received:2000-08-14 Revised:2000-12-11 Published:2001-04-15
  • Contact: Guo Yuan E-mail:guoyuan@xju.edu.cn

关键词: 二氧化钛, 恒相位元(CPE, constant phase element), 电解液, 电化学交流阻抗谱

Abstract: Under ideally polarizable conditions, TiO2 film electrode/solution electrolyte interface exhibited frequency dispersion, The effects of external factors such as the concentration of KNO3, various electrolytes and applied potentials near the flat band potential on the CPE behavior of TiO2 film electrode were studied in electrolyte solution by using A.C. impedance spectra. It was found that concentration of KNO3 had a significant effect on the CPE exponent n only when the concentration is smaller than 0.1 mol•L-1. In this concentration range, the CPE exponent n went up with increase of KNO3 concentration, once the concentration was larger than this value, however, the CPE exponent n approached to a constant, irrelevant of the concentration. Near the flat band potential, the influence of applied potential on the exponent n depended on the selected frequency range. When the frequency was in lower range, that is smaller than 0.1 Hz, this influence was obvious,on the other hand, it bore no relation to applied potential in higher frequency. Types of electrolytes only affected the CPE constant Q, having nothing to do with the CPE exponent n.

Key words: Titanium dioxide, Constant phase element(CPE), Electrolyte,  A.C.impedance spectra