The steady-state, transient and small-signal ac responses of ion exchange membrane systems are studied by using the network simulation method. A network model for the Nernst-Planck and Poisson equations is used to describe the ionic transport processes through a cation-exchange membrane and the two diffusion boundary layers on both sides of the membrane. With this model and the electric circuit simulation programme PSpice, the steady-state, chronoamperometric, chronopotentiometric and small-signal ac responses are simulated. In this work, we analyse the influence of the fixed-charge concentration inside the membrane on (1) the steady-state current-voltage characteristic, (2) the ionic fluxes ratio describing the permselectivity of the membrane, (3) the chronoamperometric response, (4) the chronopotentiometric response and (5) the electrochemical impedance. Some of the results obtained for highly charged membranes can be compared with the analytical solutions in ideal membranes.
Membrane System Diffusion Boundary Layer Applied Electric Potential Negative Fixed Charge Chronoamperometric Response
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I am indebted to Professor J. Horno for many helpful suggestions.