▎ 摘　　要

NOVELTY - Nickel-cobalt-functionalized graphene quantum dot-redox graphene composite material is prepared by (i) adding functionalized graphene quantum dots to a graphene oxide solution for immobilization of the functionalized graphene quantum dots on the surface of the graphene oxide, (ii) adding a mixed solution comprising nickel and cobalt ions to the graphene oxide solution on which a functionalized graphene quantum dot is supported to carry out a reaction, and obtaining a precipitated product which is a precursor nickel-cobalt-functionalized graphene quantum dot-graphene oxide composite material, and (iii) heat-treating the precursor under an inert atmosphere to obtain the finished composite material. USE - The composite material is useful for a supercapacitor electrode material and for an electrochemical sensor electrode material (all claimed). ADVANTAGE - The composite material has superior performance in the supercapacitor and electrochemical sensor, since the nickel-cobalt alloy particles are well dispersed and supported in the three-dimensional conductive network of graphene.