electrochemical performance of gCN@NCM electrodes were studied in a three-electrode system using 2 M KOH electrolyte. The gCN@NCM-1 electrode showed the highest specific capacitance of 641.5 F g -1 at 1 A g -1 and a cycle stability of 15.79% capacitance loss after 8000 cycles. In addition, asymmetric supercapacitor electrode was assembled with gCN@NCM as cathode, and activated carbon (AC) as anode in 2 M KOH electrolyte and recorded the maximum energy density of 22.62 W h Kg -1 at 800 W Kg -1 . The higher electrochemical performances were owing to the special structure for offering more transfer channels for charge and ion and a number of active sites for redox reaction. graphene and Cu-NiO was prepared by mixing the required amounts of appropriate metal salt solutions with aqueous dispersion of GO, ammonia solution and hydrazine hydrate and the calcination at 500 °C for 2 h in argon environment. The elemental, analysis form XPS revealed that the content of nitrogen, nickel, copper and oxygen is estimated to be 6.8, 4.9, 5. Kg -1 along with a power density of 28.82 kW Kg -1 . The increased capacitance is also due to which it has got the SBET of 809 m 2 g -1 and higher compared to both N-doped RGO (728 m 2 g -1 )