纳米TiO_2膜电极的电化学阻抗谱  

Electrochemical Impedance Spectra of Nano-TiO_2 Film Electrode

作　　者：褚道葆[1] 张金花[1,2] 冯德香[1] 李晓华[1] 姚文俐[1] 

机构地区：[1]安徽师范大学化学与材料科学学院,安徽省功能性分子固体重点实验室,芜湖241000 [2]池州师范专科学校化学系

出　　处：《应用化学》2006年第3期251-255,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(20476001);安徽省自然科学基金(00045317)资助项目

摘　　要：用电化学阻抗谱(EIS)研究了纳米TiO2膜电极在2种不同溶液中的电化学行为,给出了相应的等效电路和动力学参数。实验结果表明,外加偏置电位和电解液的性质对纳米TiO2膜的界面结构和表面电化学反应速度有显著影响,在膜反应电位区间电极阻抗主要由膜电阻Rf、电化学极化电阻Rct和W arburg阻抗Zw组成,在1 mol/L H2SO4溶液和含有乙醇的0.5 mol/L HOAc-NaOAc缓冲溶液中电极的膜电阻Rf分别为125和7 450Ω.cm2,同时由于纳米TiO2膜表面粗糙度和不均一性的影响,存在弥散效应。The electrochemical behavior of Ti/nano-TiO2 film electrode was investigated by means of Electro-chemical 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 Rf, electrochemical polarization impedance Rct and Warburg impedance Zw in the potential range of film reaction. The Rf values are 125 Ω·cm^2 and 7 450 Ω· cm^2 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.

关 键 词：纳米TIO2膜 电化学阻抗谱 催化电极 异相氧化还原电对 

分 类 号：O646.5[理学—物理化学]