▎ 摘　　要

The well-designed CoMoS4/reduced graphene oxide (RGO) composite was directly synthesized by a simple one-step hydrothermal method, in virtue of the uniformly-distributed oxygen-containing functional groups on the precursor graphene oxide (GO) surface. As expected, the optimized CoMoS4/RGO exhibits the high specific capacity of 123 mAh/g at 1 A/g, about 152% higher than that of pure CoMoS4. The reason is as follows: (1) the structure with no serious aggregation can be favor of rapid electrolyte ion transport process; (2) the RGO phase cannot only provide the high specific surface area, moderate conductivity and electrochemical double layer capacitance from the pi conjugated carbon skeleton, but also contribute to some extra Faradaic redox capacitance from a few oxygen-containing functional groups. As for practical application, the fabricated CoMoS4/RGO//AC asymmetric supercapacitor can deliver the good energy storage performances, such as the high energy density of 59 Wh/kg at 1125 W/kg (almost superior to the reported CoMoS4 based asymmetric supercapacitor devices to our best knowledge), especially for the good cycle stability with 99.3% capacity retention after 6000 cycles. Therefore, this work can provide a feasible strategy to improve the supercapacitor performances of CoMoS4.