▎ 摘　　要

Herein, graphene oxide (GO) with a 3D structure was prepared on the surface of Ni foam (NF) via electrophoretic deposition, and then reacted in situ to form 3D reduced graphene oxide (RGO) via thermal reduction. Ni-Co-S nanosheet arrays were produced on various substrates (RGO/NF, GO/NF and NF) via a facile one-step electrochemical deposition. Scanning electron microscopy (SEM) demonstrated that RGO nanosheets were vertically wrapped on NF by thermal reduction of GO. Furthermore, interconnected and hierarchical porous Ni-Co-S nanosheets were uniformly coated on RGO. The electrochemical performance of the ternary material on different substrates was investigated. The physical structures, combined with the advantages of both ternary Ni-Co-S and RGO, exhibited excellent electrochemical performance. When incorporated as electrode materials for supercapacitors, the synthesized samples possess high specific capacitance and a long cycle life. With the synergistic effect of RGO and ternary Ni-Co-S, a high performance is achieved. The specific capacitance of Ni-Co-S/RGO/NF (2643 F g(-1)) demonstrated an enhancement compared with Ni-Co-S/GO/NF (2083 F g(-1)) and Ni-Co-S/NF (1329 F g(-1)) at a current density of 10 A g(-1). Additionally, the retention of specific capacitance of Ni-Co-S/RGO/NF after 2500 cycles displayed a superior cyclic stability of 84.22% at a current density of 50 A g(-1).