TRIANGULAR POTENTIAL SWEEP VOLTAMMETRIC STUDY OF POROUS IRON ELECTRODES IN ALKALI SOLUTIONS

The cyclic voltammograms of pure iron and sintered iron electrodes in 6. 0 M KOH solutions revealed a plateau and two anodic peaks in the forward direction and two cathodic peaks in the backward direction when polarized from minus 1. 3 to minus 0. 3 v vs Hg/HgO. In the forward scan the formation of Fe(OH)//2 and FeOOH occurs and these are subsequently reduced to Fe(OH)//2 and iron in the backward scan. The peak potential separation of the Fe/Fe(II) and Fe(II)/Fe(III) couples at zero sweep rate and the ratio of cathodic to anodic charges at zero sweep rates for the above two redox couples have been used to evaluate the reversibility of porous iron electrodes.