Abstract
In this study, mesoporous nickel disulphide (NiS2) nano-particles have been successfully prepared using hydrothermal method. Phase formation and functional groups were identified by the high-resolution X-ray diffractometer (HR-XRD) and Fourier transform infrared spectroscopy (FTIR), respectively. Energy band gap of prepared NiS2 nanoparticles has been studied by diffuse reflectance spectroscopy. FESEM and N2 adsorption–desorption analysis affirmed that surface of the NiS2 nanoparticles is rough with large pore diameter 6.46 nm. Electro-catalytic properties of NiS2 have been analysed by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry technique in 1 M aqueous LiOH electrolyte. Electrochemical characterization affirmed that NiS2 has minimum charge transfer resistance (Rct) value of 3.84 Ω with enhanced areal capacitance 9.23 F cm−2 which showed 87% cyclic stability.
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