纯铝在碱性甲醇溶液中阳极过程的电化学阻抗谱解析

Electrochemical Impedance Spectroscopy Analysis on Anodic Dissolution of Pure Aluminum in an Alkaline Methanol Solution

采用电化学阻抗谱方法研究纯铝在碱性甲醇溶液中阳极溶解的电化学行为.提出分别基于等效电路模型和电极反应动力学的电化学阻抗模型,推导出分别以等效电路元件和电极反应的状态变量的偏导数表示的法拉第导纳表达式.利用测得的阻抗数据解析出状态变量和各基元反应步骤的动力学参数数值.在此基础上,分析了纯铝在碱性甲醇溶液中阳极溶解过程的电化学反应机制.

The anodic dissolution of pure aluminum in an alkaline methanol solution was investigated by electrochemical impedance spectra（EIS）.The EIS models were proposed based on the circuit model and the electrochemical kinetics,respectively.Then the Faradic admittances were expressed by the equivalent circuit elements and the partial differentials of state variables for the electrode reactions,respectively.The values of state variables and kinetic parameters of the elemental reaction steps were solved from the obtained EIS data.Based on the above experimental results,the electrochemical kinetic mechanism of the anodic dissolution of aluminum was discussed.