Electrochemical Behavior of Vanadium Compounds at Carbon Paste Electrode(CPE)

The electrochemical behavior of V 2O 3, V 2O 5 and NH 4VO 3 at carbon paste electrode(CPE) in H 2SO 4 solution were investigated by cyclic voltammetry. The results showed that for vanadium(Ⅲ) compound there appeared two reduction peaks but three oxidation peaks in cyclic voltammograms in different H 2SO 4 concentration solutions, while for two vanadium(Ⅴ) compounds there were four reduction peaks and four oxidation peaks, quite close to each other. The corresponding redox peaks were reasonably analyzed and the reaction mechanism has been discussed briefly.