Investigations on the V(III) Reduction Process of All-Vanadium Redox Flow Battery

摘要

The V(III) reduction process of all-vanadium redox flow battery was investigated by cyclicvoltammetry, polarization curve and AC impedance. It was shown that V(III)/V(II) couple hadundesired electrochemical activity and the V(III) reduction process was in mix controlling step. Theprobable reason was that the existence of complex of V(III), which had big ion radius, resulted in largediffusion resistance in the process of mass transfer. Therefore, the kinetics of V(III) reduction reactionwas slow.