Correction for the Concentration Polarization for Simultaneous Reduction of Several Reactants: Platinum(II) Aquachloride Complexes

The reaction of electroreduction of platinum(II) aquachloride complexes on a negatively charged dropping mercury electrode is used to determine specific features of interpretation of experimental data in the case of parallel conversion of several forms of a reactant, connected with the manner of introducing a correction for the concentration polarization. The difference in the charges of species undergoing simultaneous reduction gives rise to ambiguity when analyzing kinetic data on the dependence of current on the supporting-electrolyte concentration at constant electrode charge. A new self-consistent technique for deducing model parameters (ratio between reactant discharge rate constants) is proposed.