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Simulation of the impedance of two-dimensional porous electrodes.

The frequency response of porous electrodes has been investigated using a two-dimensional randomwalk algorithm. For simple geometries the values obtained for the characteristic constant-phase-angle exponent is in good agreement with theoretical expectations. The random-walk approach has also been used to study the response of more complex disorderly geometries. In general, the simulation results can be understood in terms of the growth of the active length (that part of the electrode-electrolyte interface that participates in the transport process) as the sticking probability or frequency is decreased