Facile synthesis of nickel manganese sulfide anchored graphitic carbon nitride/graphene electrode for supercapacitor application

The nickel manganese sulfide (Ni-Mn-S) anchored on graphitic carbon nitride/graphene (g-C₃N₄-G) composite (Ni-Mn-S/g-C₃N₄-G) was prepared via a one-pot solvothermal method for supercapacitor application. FE-SEM and TEM analyses confirmed that the Ni-Mn-S nanoparticles were attached with the graphitic carbon nitride/graphene nanosheets (g-C₃N₄-G). The g-C₃N₄-G sheets deliver a large surface area to reduce self-aggregation and confine the morphology of the Ni-Mn-S particles, resulting highly conductive network of Ni-Mn-S/g-C₃N₄-G. Ni-Mn-S/g-C₃N₄-G based electrode exhibited high specific capacitance of 1697 F g^-1 at a current density of 1 A g^-1 and excellent rate capability (91% capacity retention after 2,000 cycles at 10 A g^-1) due to the abundant porous nanostructure, relatively high specific surface area, well-defined spherical morphology, and the synergetic effect of Ni-Mn-S and g-C₃N₄-G.