Oxygen Evolution Nickel Hydroxide Electrodes in a Ni-MH Battery Prototype

Abstract

The effect of cobalt in both alpha and beta phases on the oxygen evolution of nickel hydroxide was studied. The electrochemical properties of the oxygen evolution reaction on the positive nickel hydroxide electrodes were studied under conditions similar to those of a commercial Ni-MH battery. The presence of different kinds of defects in the structure of the active material was determined by XRD methods distorted and asymmetric reflections in the XRD patterns. Both the morphology of the active material and the additives influence the oxygen evolution potential and the electrochemical characteristics. The experimental results showed that the optimized prototype used in this work is suitable for evaluating several electrochemical parameters. It was shown that the electrode without cobalt exhibited the charging efficiency was 94% and those with cobalt exhibited a charging of 98%.

Optimization of nickel hydroxide electrode of the hybrid supercapacitor

“…By analyzing this dependency, it can be concluded that under high current densities, a decrease of specific capacity during cycling is tied with the evolution of large volumes of oxygen which causes active mass to fall off. The oxygen evolution during charge is a side reaction, the rate of which is proportional to charge current density [20,21]. When 2 % PTFE have been used in active mass composition the electrode specific capacity has been greatly increased (Fig.…”