Abstract: The electrode coated with PVP(polyvinyl-pyridine) film electrostatically bound PtCl₆^2- has been studied by means of cyclic voltammetry. The results showed that the electrode has a good electrocatalytic activity in the oxidation of Fe²⁺ to Fe³⁺ in aqueous acidic solution. The rate-controlling step and the kinetic parameters of catalytic reaction were determined by rotating disk electrode coated with PVP electrostaticaIIy bound PtCl₆^2-. The rate constant of the catalvtic reaction was calculated to be 5.67?10⁵cm³·mol^-1·s^-1. The number of electron transfered and the anodic transfer coeffcient were determined.The electrode coated with promoted PVP electrostatically bound PtCl₆^2- give very stable response for the oxidation of Fe²⁺ to Fe³⁺.

Key words: hexachloroplatinic acid, polyvinylpyridine, chemical modified electrode, ferrousion, catalytic oxidation