In today’s era, the demand for energy is continuously increasing and hence the enrgy storage devices. Amongst various available devices here specifically an electrode material is designed for the supercapcitor application. In the artice, we have synthesized thenanocomposites of Nickel sulfide (NiS₂) nanosheets and decavanadate (DV) by chemical reflux method. The structural characterization is carried out using X-Ray diffraction (XRD), Fourier transform infrared spec-troscopy (FTIR), which confirm successful synthesis of nanocomposite. Further, microstructural characterization is done using scanning electron microscopy (SEM) which has shown homogeneous and highly porous morphology. The capacitive properties are studied using cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) method in 2 M KOH solution in three electrode cell assembly. Along with this the temperature variation study has also been carried to optimize the temperature towards charge storage characteristic. It is observed that as the temperature increases, specific capacitance also increases, with value as high as 510 F/g @5 mV/s observed at 100℃ higher than those of bare NiS₂ (reported earlier). Enhanced electrochemical performance of nanocomposite is due to incorporation of DV which provides ion buffering reservoirs to boost deep faradaic reactions with good ion diffusion and enhanced electrochemically active surface area. Also, it is assumed that DV is a redox active polyoxometalate which not only act as spacer between nanosheets but additionally offers charge storage through pseudocapacitance. These results suggest high efficiency of polyxoxmetalate induced metal sulfides for next generation supercapacitors.

Nanocomposites, XRD, FTIR, Nanosheets