and vanadium nitride (93 m 2 g -1 ). To extend the fabrication of composite involving spinel-based transition metal sulphides, the same group synthesized the ternary cobalt copper sulphide (Co2CuS4) decorated over N-doped graphene sheets (Co2CuS4 /NG) using one-pot hydrothermal technique by mixing the required quantities of aqueous solution of metal salts precursors and thiourea with GO dispersion at 80 °C for 12 h and 180 °C for 6 h in a Teflonlined stainless-steel autoclave . The atomic content of nitrogen in the composite was estimated to be 9.4% from XPS analysis. From Fig. , it is apparent that the composite (Co2CuS4 /NG) obtained the specific capacitance of 1005 F g -1 at 1 A g -1 which is relatively greater than Co2CuS4 (768), NG (346), CoS/NG (651) and Cu2S/NG (509) at 1 A g -1 in 6 M KOH aqueous solution and too good coincidence with CV profiles as depicted in Fig. .