Study of Electrical Migration in Electrochemical Cells by the Network Method

Abstract

AbstractNetwork approach has been used to analyse the electrical properties of a system consisting of three ionic species having different charges in contact with blocking electrodes. A network model for the electrodiffusion process taking place in such a system has been proposed. With this model and the electric circuit simulation program PSPICE, the transient response of the system to a step‐function applied potential difference and the small‐signal ac response of this system subject to a steady external voltage bias have been simulated. Nyquist plots for the electrochemical impedance, and the time evolution of the surface charge density stored in the electrical double layers at the electrode/electrolyte interfaces as well as the electric current density through the system, are given. The ionic concentration, the electric charge density, and the electric potential profiles across the cell were also obtained as a function of time.