▎ 摘　　要

Transition metal sulfides (TMS), as promising electroactive materials for asymmetric supercapacitors, have been limited due to their relatively poor conductivity and cycle stability. Here ternary Ni3S2/MnS/CuS composites were assembled in situ on nickel foam (NF) using a hydrothermal method via electrostatic adsorption of Ni+, Mn2+ and Cu2+ ions on a reduced graphene (rGO) nanosheet template. The chemical structure was characterized by various analytic methods. Ni3S2/MnS/CuS has spherical morphology assembled from closely packed nanosheets, while Ni3S2/MnS/CuS@rGO has a three-dimensional porous spherical structure with much lower diameter because rGO nanosheets can play the role of a template to induce the growth of Ni3S2/MnS/CuS. At a current density of 1 A g(-1), the specific capacitance was obtained to be 1028 F g(-1) for Ni3S2/MnS/CuS, 628.6 F g(-1) for Ni3S2/MnS@rGO, and 2042 F g(-1) for Ni3S2/MnS/CuS@rGO, respectively. Charge transfer resistance (R-ct) of Ni3S2/MnS/CuS@rGO (0.001 omega) was much lower than that of Ni3S2/MnS@rGO by 0.02 omega, and lower than that of Ni3S2/MnS/CuS by 0.017 omega. After 5000 cycles, the Ni3S2-MnS-CuS@RGO electrode maintains 78.3% of the initial capacity at 20 A g(-1). An asymmetric supercapacitor was subsequently assembled using Ni3S2/MnS/CuS@rGO as the positive electrode and rGO as the negative electrode. The specific capacitance of asymmetric batteries was maintained at 90.8% of the initial state after 5000 GCD.