NiPNiO electrolytic layers as anode materials

Abstract

Composite electrolytic layers were obtained on an amorphous nickel base with the addition of nickel oxide, in galvanostatic conditions at a temperature of 293 K, from a nickel-plating electrolyte in the coating containing a suspension of nickel oxide. The content of nickel oxide in the coatings depends on the conditions in which they were obtained. Using the potentiodynamic method, for these composite layers the polarisation curves of the oxygen electroevolution process from the 1 M KOH solution were determined. For comparison, curves were also plotted for copper and an amorphous Ni-P electrode. The electrodes were subjected to anode-cathode cycling in the range from the potential of oxygen evolution to the potential of hydrogen evolution. For the modified electrode materials, the characteristics of the oxygen electroevolution process were again determined. From these results the influence of the electrode material, and also the influence and advantage of preliminary modification of the surfaces of the electrodes on the process of oxygen evolution in an alkaline environment, were estimated. It was indicated that a correlation exists between the values of the exchange current of the oxygen electroevolution reaction and the electro-oxidation ability of ethanoloamine on the electrode materials studied.