Effect of C₄₈H₂₆N₈ coating on electrochemical performance of alkaline super iron battery
2012
Yang, Bin | Yang, Zhanhong | Wang, Suqin | Chen, Hongyan
Electrochemical behavior of potassium ferrate(VI) (K₂FeO₄) coated with different content of 2,3-Naphthalocyanine (H₂Nc) is investigated as a function of exposure time in electrolyte. Galvanostatic discharge curves indicate that the stability of K₂FeO₄ cathode is improved by coating a layer of H₂Nc. In short exposing time of 3h, the capacity of coated K₂FeO₄ shows slight decrease with increase of H₂Nc content. But in longer exposing time of more than 6h, the K₂FeO₄ cathode coated with more than 2% H₂Nc shows better capacity. Open-circuit potential curves indicate that the stability of K₂FeO₄ increases with increasing H₂Nc content. Electrochemical impedance spectroscopy (EIS) results reveal that H₂Nc partially hinders the contact between K₂FeO₄ and the aqueous media, and enhances the ability of electron transfer in the electrode, which are responsible for the enhancement of K₂FeO₄ stability.
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