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Citation: Guo Yuan, Li Yong-Jun, Xia Xi, Zhang Xiao-Gang, He Mao-Xia. Effect of Extrinsic Factors on the CPE Behavior of Film TiO₂ Electrode[J]. Acta Physico-Chimica Sinica, ;2001, 17(04): 372-376. doi: 10.3866/PKU.WHXB20010419 shu

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

1.
Institute of Applied Chemistry, Xinjiang University, Urumqi　830046

Received Date: 14 August 2000
Available Online: 15 April 2001

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.
- Titanium dioxide;Constant phase element(CPE);Electrolyte;　A.C.impedance spectra
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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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