EFFECT OF ZINC AND IRON IONS ON THE ELECTROCHEMISTRY OF NICKEL-OXIDE ELECTRODE - SLOW CYCLIC VOLTAMMETRY

Porous nickel oxide electrodes were prepared by cathodic electroprecipitation from metal nitrate solutions on sintered substrate and characterized by slow (0.1 m V/s) voltammetry in 6 mol/l KOH. The presence of iron or zinc ions added to the electrolyte after formation of the electrodes resulted in a decrease of electrode charging ability. Removal of iron or zinc ions and presence of lithium ions partially restored the voltammogram to original conditions. Presence of cobalt in the electrode material diminished substantially the influence of zinc ions on the electrode properties.