MATHEMATICAL MODEL FOR VANADIUM(V) ELECTROREDUCTION KINETICS UNDER THE CONDITIONS OF STRIPPING VOLTAMMETRY AT A GRAPHITE ELECTRODE IN NH//4Cl SOLUTIONS OF DIFFERENT pH.

The effect of electrolysis potential on the maximum current of anodic electrooxidation of the vanadium deposit is studied at a graphite electrode in 0. 1 M NH//4Cl solutions of different pH (7. 70, 8. 45, 8. 85) under conditions where the VO//3** minus undergo reduction to V//2O//3(s) and V//2O//2(s). Transfer coefficients were calculated for the reduction of VO//3** minus to V//2O//3(s) ( alpha //1 equals 0. 16 plus or minus 0. 01) and of VO//3** minus to V//2O//2(s) ( alpha //2 equals 0. 14 plus or minus 0. 02). A semiempirical equation is proposed which describes the experimental relation between maximum current of anodic electrooxidation of oxide V//2O//3 and the electrolysis potential at different pH, and allows for the probable mechanism of vanadium(V) electroreduction under the conditions studied.