Evaluation of potassium ferrate(VI) cathode material coated with 2,3-Naphthalocyanine for alkaline super iron battery

The stability of potassium ferrate(VI) (K2FeO4) electrodes was dramatically improved by using 2,3-Naphthalocyanine (C48H26N8) as coating. The electrode material with the coating was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). K2FeO4 electrodes coated with 2,3-Naphthalocyanine provided a superior capacity and stability to uncoated K2FeO4 electrodes. Cathodic charge capacity of K2FeO4 coated with 2,3-Naphthalocyanine is 42% higher than that of K2FeO4 uncoated when discharged at rate of 0.25 C to a cutoff of 0.8 V after storing in the 10 mol/L KOH solution for 3 h.