Low Temperature Synthesis and Characterization of rGO-CoO Nanocomposite with Efficient Electrochemical Properties

Graphene has been offered as a promising two dimensional nanomaterial with outstanding electric, thermal and mechanical properties for many applications. Here we narratea facile approach to prepare a reduced graphene oxide-cobalt oxidenanocomposite (rGO-CoO) via a general co-precipitation method at 80 °C and within 6 hours reaction period and the final product was annealed at 500 °C. Transmission electron microscope images show that the cobalt oxide nanoparticles (10-20 nm) are encapsulated by a reduced graphene oxide shell. The oxidation states of the nanocomposite were confirmed by XPS studies. The electrochemical properties of the nanocomposite were investigated by using cyclic voltammetry (CV). A maximum specific capacitance of 175 F/g was obtained at a scan rate of 10 mV/s.