DYNAMIC SIMULATION OF CYCLIC VOLTAMMOGRAM ON THE ELECTROCHEMICAL REDUCTION OF VO2+ IONS

An electrochemical reduction of VO2+ ions in a formic acid electrolyte was analyzed by cyclic voltammetry. A new four step reaction mechanis m, EECE, was proposed to derive the mass transfer equation, and then i t was solved by numerical method, which enabled us to obtain theoretic al cyclic voltammograms. Kinetic parameters such as diffusion coeffici ents, rate constants and transfer coefficients, describing the VO2+ io n reduction system, were estimated by fitting the theoretical curve wi th the experimental data. The parameters obtained were then evaluated on their extended applicability in various concentrations and scan rat es. It was shown that the theoretical voltammograms obtained using the above parameters fitted well with the experimental curves for the sca n rate variation from 2 to 20 V/sec, while the deviation increased in proportion to the VO2+ ion concentration.