Electrode kinetics of the CdII/Cd–Hg system in ethylene glycol–water mixtures

Abstract

The kinetics of the Cd^II/Cd–Hg system in ethylene glycol–water mixtures containing different concentrations of LiClO₄ has been studied by cyclic voltammetry. At scan rate >0.2 V s^–1 the system shows quasireversible behaviour, whereas at lower scan rates it behaves reversibly. The diffusion coefficient for Cd in mercury, the reversible half-wave potentials of the Cd^II ion, the transfer coefficient for the electroreduction of Cd^II and the apparent standard rate constants of the system have been determined. The change in the kinetics with solvent composition at each LiClO₄ concentration tested is discussed in terms of existing models.