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. Published in Russian in Elektrokhimiya, 2006, Vol. 42, No. 4, pp. 355–360. The text was submitted by the authors in English.