ELECTROCHEMICAL REDUCTION OF SILVER THIOSULFATE COMPLEXES .2. MECHANISM AND KINETICS

In this paper the thermodynamic data for complex formation between Ag and S2O32- ions, determined previously, are applied to kinetic invest igation of the reduction of silver thiosulphate complexes. Both electr ochemical (linear sweep voltammetry on a rotating disc electrode) and surface analytical (Auger electron spectroscopy) techniques are used. The deposits resulting from the electrodeposition of silver 'thiosulph ate complexes are shown to be composed of silver and to be polycrystal line. The reduction follows a mechanism involving mass and charge tran sfer and chemical reaction steps. The relevant kinetic parameters are calculated and a rate equation describing the kinetics of the reductio n is given.