A study of the V(II)/V(III) redox couple for redox flow cell applications

The electrochemical behaviour of the V(III)/V(II) redox couple has been investigated at glassy carbon electrodes using cyclic voltammetry. The oxidation/reduction is found to be electrochemically irreversible with a value ko = 1.2 × 10−4 at pH = 4. A slight trend in ko with pH is observed. Electrode poisoning effects are observed at the glassy carbon electrode, and surface preparation is found to be critical in determining observed behaviour.