Allowing for the concentration polarization when analyzing experimental data for electrode processes involving an ensemble of reactants

It is shown that the procedure used for calculating kinetic currents from mixed ones must be corrected to allow for the fact that the contributions made by reactants of different charges depend on the electrode potential (charge) during parallel electrochemical conversions. Relations for relevant corrections are derived within a stationary-diffusion model. For illustration, estimates are given for parallel reduction of the peroxodisulfate anion and its associate with the sodium cation. This example demonstrates that, with the correction under discussion ignored, the average charge of the reactant-anion in the bulk solution always happens to be somewhat overrated (by the absolute value), when determined from a dependence of the kinetic current on the supporting-electrolyte concentration. The tendency of reactant's average charge to depend on the electrode charge observed earlier is explained.