▎ 摘　　要

Graphene plays an essential role in the energy conversion field because of its particular geometrical structures. With its development, the study of its by-products (e.g., graphene residual carbon) is urgent. Herein, the novel synthesis of nickel sulfide and carbon-based material composite (NiS/GR) by one-step hydrothermal method via utilization of graphene residual carbon prepared by Hummer method as carbon-based material. The influence of graphene residual carbon content (5%, 10%, and 15%) on the electrochemical performance of NiS/GR in investigated. It is that when the content of graphene residual carbon is 5%, exhibiting the highest specific capacitance (774 F/g at 1 A/g), good rate capability (78.1% retention after current density increases to 10 A/g) and good cycling performance (77.2% capacitance retention after 1000 cycles at 5 A/g).