Exploring the electrochemical performance of Ferrous Nickel Pyrophosphate Thin Film Electrodes for Potential Supercapatior Applications

Abstract

The present work deals with the preparation of ferrous nickel pyrophosphate (Fe2Ni2P2O7) thin films via a facile approach namely chemical bath deposition. X-ray diffraction analysis evinces that the prepared Fe2Ni2P2O7 thin films are of monoclinic structure and crystallinity is improved by increase in Fe concentration with a preferential orientation along the (111) direction. The surface morphology analysis reveal the microsphere like morphology and uniform anchoring of Fe2 on Ni2P2O7 thin film surface, which is favorable for good charge transfer between the electrode and electrolyte interface. Electrochemical analysis shows that, the Fe2Ni2P2O7 film electrode offers a specific capacitance of 501 F/g with excellent electrochemical and cyclic stability. The capacitive and diffusive contributions to the total capacity of the electrode are studied by employing Trasatti and Dunn’s model. Further, the obtained value of ‘b’ in the modified power law ranges from 0.66 to 0.69 confirming both the capacitive and diffusive charge storage mechanism in the electrodes under study. The features and hybrid nature in storage property of Fe2Ni2P2O7 electrodes are unique and highlights them as promising candidates for energy storage application.