Electrochemical performance of NiS/r-GO composite-based electrode material for electrochemical energy storage application

Integration of transition metal sulfides with reduced graphene oxide has grabbed the attention of researchers owing to its high specific capacitance, surface area, conductivity, large active sites, excellent rate capability, and outstanding stability making it a desirable electrode material for electrochemical energy storage devices. Herein NiS/rGO composite and pristine NiS were synthesized via a solvothermal method. The physical and chemical properties of the NiS/rGO composite were characterized by various analytical methods namely XRD, FE-SEM, TEM, XPS, EDS, BET, and Raman spectra. The NiS/rGO composite exhibited irregular sphere-like morphology favoring the electrode material with increased surface area, porosity, and conductivity. The electrochemical performance of NiS/rGO anode electrode material demonstrated an exceptional specific capacitance of 1669 F g⁻¹ at 2 A g⁻¹ with 65.71% capacitance retention after 1000 cycles at a current density of 10 A g⁻¹ and remarkable efficiency of 98.94%. Thus, the unique structural properties and electrochemical performance of NiS/rGO composite make it a prominent electrode material for energy storage applications.