【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。更多还原

【Abstract】 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.更多还原