A faradaic impedance study of the electrochemical reduction of Cd(II) ions from aqueous 1 M (KF+KCl) mixed electrolyte solutions at the dropping mercury electrode

Abstract

It is shown that in the whole range of the composition of this base electrolyte the Cd(II) reduction can be explained on the assumption of a reaction mechanism that consists of a chemical step followed by two one-electron transfers, the transfer coefficients of which both appear to be 0.5. The rate constant of the chemical step is shown to increase rapidly with chloride ion concentration. The dependence of the electrochemical rate constants on the composition of the base electrolyte is also reported and discussed.