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Citation: CHU Dao-Bao, ZHANG Jin-Hua, FENG De-Xiang, LI Xiao-Hua, YAO Wen-Li. Electrochemical Impedance Spectra of Nano-TiO₂ Film Electrode[J]. Chinese Journal of Applied Chemistry, ;2006, 23(3): 251-255. shu

Electrochemical Impedance Spectra of Nano-TiO₂ Film Electrode

1.
a College of Chemistry and Materials Science, Anhui Normal University, Anhui Key Laboratory of Functional Molecular Solids, Wuhu 241000;
2.
b Department of Chemistry, Chizhou Normal College Anhui, Chizhou

Corresponding author: CHU Dao-Bao,
Received Date: 20 May 2005
Available Online: 16 September 2005
Fund Project: 国家自然科学基金(20476001) (20476001)安徽省自然科学基金(00045317)资助项目 (00045317)

The electrochemical behavior of Ti/nano-TiO₂ film electrode was investigated by means of Electrochemical Impedance Spectra(EIS) in two different solutions,relevant equivalent circuit and electro- chemical kinetic parameters were also presented.The results indicate that the electrode impedance is consisted of film resistance R_f,electrochemical polarization impedance R_ct and Warburg impedance Z_w in the potential range of film reaction.The R_f values are 125 Ω·cm² and 7 450 Ω·cm² respectively in 1 mol/L H₂SO₄ and 0.5 mol/L HOAc-NaOAc buffer electrolyte containing ethanol.There is dispersion effect due to the roughness and inhomogeneity of nano-TiO₂ film surface.
- nanocrystlline TiO₂ film,
- electrochemical impedance spectra,
- catalytic electrode,
- heterogeneous redox system
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Electrochemical Impedance Spectra of Nano-TiO₂ Film Electrode