Charge-discharge behavior of K2FeO4 electrodes in concentrated KOH solutions

The charge-discharge behavior of the K2FeO4 electrodes with different current collectors is investigated by various electrochemical techniques. Due to higher electrochemical stability of platinum, the K2FeO4 electrode using platinum lattice as current collector displays better primary discharge performance than those with silver lattice and nickel foam as current collectors. The galvanostatic charge-discharge experiments indicate that the K2FeO4 electrodes have low electrochemical reversibility, which may result from their relatively lower oxygen evolution potentials or the effects of the oxidation/reduction of current collectors. The experimental results of intermittent discharge, cycle voltammetry, and XRD show that the discharge reaction of the K2FeO4 electrode may consist of two steps.