Effects of additives and surface treatment on electrochemical performance for bafeo4 electrode

BaFeO4 was prepared by using the raw material K2FeO4. The structure of the product was characterized by X-ray diffraction and infrared radiation. Particle size and morphology were analyzed by SEM. BaFeO4, the mixture of BaFeO4, and additives were used as cathode, zinc used as anode, with which discharge performance test was carried out in the KOH electrolyte with a concentration of 14 mol/L. The results show that the discharge performance of BaFeO4 is obviously enhanced, the discharge platform is increased by 0.3 V, and the capacity reached up to 240 mAh/g, increased by 40 mAh/g after 5% of K2S2O8 was added. In addition, the discharge capacity is increased by 65 mAh/g via treating the electrode surface with TiO2 sol, reached up to 265 mAh/g, and electrochemical performance is obviously improved. The reason of improving property is discussed in the work too.