Hydrothermal Synthesis and Electrochemical Properties of CoS₂–Reduced Graphene Oxide Nanocomposite for Supercapacitor Application

A Cobalt disulfide–reduced graphene oxide (CoS 2 -RGO) nanocomposite was prepared by a simple hydrothermal method and the prepared nanocomposite was characterized using various techniques like XRD, SEM and FTIR. The results of these techniques indicated the uniform deposition of CoS 2 nanoparticles on Graphene sheets. Further, the prepared nanocomposites were tested for its activity towards energy storage and the test results showed a specific capacitance of 28[Formula: see text]F/g in an aqueous 20% KOH electrolyte at a current density of 0.5[Formula: see text]A/g. All these materials showed highly reversible charge–discharge cycles. The overall electrochemical performance of this composite is shown to be drastically improved when compared to bare CoS 2 nanoparticles. Thus with the good electrochemical properties, CoS 2 –RGO nanocomposites could be effectively used as an electrode material for supercapacitors.