Synthesis of Cobalt sulfide-Graphene (CoS/G) nanocomposites for supercapacitor applications

CoS and graphene nanocomposites was prepared from cobalt nitrate, thioacetamide and graphene as starting materials in the presence of poly(vinylpyrrolidone) as surfactant. Further its morphology and properties were characterized by X-ray diffraction (XRD), Field Emission scanning electron microscope (FESEM), Diffusive reflectance Ultraviolet–Visible spectroscopy (DRS-UV-Vis), Fourier Transform Infrared spectroscopy (FTIR) and electrochemical measurements. The XRD reveals the amorphous nature of the nanocomposites. The as prepared nanocomposites were tested for its supercapacitance property by cyclic voltammetric (CV) experiment in 6M KOH electrolyte.CV was performed at a potential range of 0 V to -0.8 V at different scan rates and results show an excellent capacitive behavior of the nanocomposites. A maximum specific capacitance of 2423.3 F/g was obtained at a scan rate of 5 mV/s.