物理化学学报 >> 1998, Vol. 14 >> Issue (09): 804-810.doi: 10.3866/PKU.WHXB19980908

研究论文 上一篇    下一篇

粉末多孔镍电极电化学阻抗谱及其数学模型

袁安保, 成少安, 张鉴清, 曹楚南   

  1. 浙江大学化学系,杭州 310027
  • 收稿日期:1997-12-15 修回日期:1998-03-16 发布日期:1998-09-15
  • 通讯作者: 袁安保

Electrochemical lmpedance Spectroscopy of Porous Nickel Electrode and its Mathematical Model

Yuan An-Bao, Cheng Shao-An, Zhang Jian-Qing, Cao Chu-Nan   

  1. Department of Chemistry,Zhejiang University,Hangzhou 310027
  • Received:1997-12-15 Revised:1998-03-16 Published:1998-09-15
  • Contact: Yuan An-Bao

摘要:

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τ0等的改变,电极的不同荷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.

关键词: 多孔镍电极, 电化学阻抗谱, 数学模型

Abstract:

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

Key words: Porous nickel electrode, Electrochemical impedance spectroscopy(EIS), Mthematical model