粉末多孔镍电极电化学阻抗谱及其数学模型

Electrochemical Impedance Spectroscopy of Porous Nickel Electrode and its Mathematical Model

镍电极反应动力学在大多情况下是受固态质子扩散过程控制的，以此为出发点建立了具有明确物理意义的镍电极电化学阻抗谱（EIS）的数学模型．并以该模型为基础，讨论了一些模型参数如双电层电容C（d1）、质子扩散系数D及活性物质位于半径γ0等的改变，电极的不同行电状态以及多孔镍电极中的传质过程对镍电极阻抗谱的影响．理论模型较好地解释了一些实验结果．

A mathematical model for electrochemical impedance spectroscopy(EIS) of porousnickel electrode has been proposed based on the fact that the kinetics of nickel electrode reaction ismainly controled by the proton diffusion in solid state. Effects of some parameters such as doublelayer capacitance Cd1, diffusion coeffecient of proton D and powder size of active material To onthe EIS of nickel electrode have been predicted according to this model. The effects of state ofcllargc(SOC) and mass transport in liquid phase on the EIS of porous nickel electrode hare alsobeen discussed.