MODELING THE IMPEDANCE OF A METAL-ELECTRODE DURING ADSORPTION OF DISCHARGING METAL-CATIONS - EFFECT OF THE RESISTANCE OF THE CHARGE-TRANSFER STAGE

On the basis of the generalized model (GM) of the electrode impedance, which takes into account the possibility of a parallel discharge and adsorption of the M+ cation at a metal electrode M, the effect the res istance R-f of the charge-transfer stage has on the impedance spectra calculated for a model system M/[mc MX + (1 - m)c CX + H2O] is analyze d. The impedance spectra calculated within the framework of GM, the tr aditional model (TM), and the Randles-Ershler model (RE) are compared for R-f varying from 0 to infinity in a mixed electrolyte. It is shown that the difference between GM and TM is very small at R-f = 0 and sh arply increases with the increasing R-f; the RE model predicts qualita tively different spectra.