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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.

The development of electrode materials for supercapacitors is really progressive and it still poses a huge challenge for researchers in many aspects. Doping of transition metals is indeed effective method because fast interfacial charge transfer kinetics has demonstrated their potential supercapacitive nature. The present work submits the structural, morphological and electrochemical performances of nickel pyrophosphate (Ni2P2O7) and manganese doped nickel pyrophosphate (Mn‐Ni2P2O7) thin film electrodes synthesized by chemical bath deposition method. The crystal structure of Ni2P2O7 obtained through X‐ray diffraction (XRD) is confirmed to be monoclinic which remains unaltered despite of Mn doping concentration. Morphological studies reveal that crystalline phase of Mn is intimately anchored on the surface of Ni2P2O7 which is beneficial for better charge transfer between transition metal and transition metal phosphates. A specific capacitance value of 603 F/g is obtained for 3 M concentration of Mn doped Ni2P2O7 from galvanostatic charge‐discharge curve at current density 1 A/g. This value is noticeably higher than what is obtained for the pure Ni2P2O7 indicating that Mn doping enhances the electrochemical performance of Ni2P2O7 thin films.

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