NUMERICAL-SIMULATION OF KINETICALLY CONTROLLED ELECTROSORPTION PROCESSES UNDER CYCLIC VOLTAMMETRIC CONDITIONS

The computations described in the paper are based on the Frumkin adsor ption isotherm. Variation of the electrosorption valency with potentia l is taken into account. The rate-determining step can be either diffu sion or interfacial kinetics. The kinetics of charge transfer associat ed with the formation of a chemical bond between an adsorbate and an e lectrode is described in terms of the Butler-Volmer equation. The effe ct of lateral interactions between adsorbed molecules and the activate d complex is also considered. The presented dependences of the peak wi dth and peak potential on the electrode coverage and the sweep rate al low the determination of various kinetic and thermodynamic parameters of the adsorption process. Computations were carried out for both line ar and spherical symmetry of diffusion.