Nanostructured CuO/reduced graphene oxide composite for hybrid supercapacitors

To address the issues such as low ionic conductivity, poor electrode kinetics and cyclic stability, the strategy of combining carbon-based materials with transition metal oxide (TMO) is adopted. In this article, the preparation of CuO/reduced graphene oxide (RGO) nano-composite electrodes by a simple, low cost hydrothermal method is described. This hybrid nanocomposite exhibits a high specific capacitance of 326 F g(-1) at a current density of 0.5 A g(-1). It shows a high energy density of 65.7 W h kg(-1) at a power density of 302 W kg(-1). Further, this material does not exhibit any measureable degradation in electrochemical performance, even after 1500 cycles. Symmetric hybrid capacitors exhibit a specific capacitance of 97 F g(-1) at 0.2 A g-1 with a power density of 72 W kg(-1). These superior electrochemical features demonstrate that the CuO/ =RGO hybrid nanocomposite is a promising material for next-generation supercapacitor systems.