Development of Cobalt Sulfide-graphene Composite for Supercapacitor Applications

Co₉S₈/reduced graphene (CSRG) has been prepared by a facile two step hydrothermal method and used as a supercapacitor electrode material. It is anticipated that the Co₉S₈ and reduced graphene oxide (RGO) would serve as a spacer material to each other to stop the agglomeration and simultaneous contribution of electrical double layer capacitance (RGO) and pseudocapacitance ( Co₉S₈ ) would provide high electrochemical properties. The chemical analysis has been done by Fourier transform infrared spectroscopy and the morphology is characterised by field emission scanning electron microscopy. CSRG shows a high electrical conductivity of 98S\;m⁻¹ . The symmetric supercapacitor shows a specific capacitance of ~728F\;g⁻¹ with a current density of 2A\;g⁻¹ . CSRG also showed an energy density of 25.2Wh\;kg⁻¹ with a power density of 1000W\;kg⁻¹ .