▎ 摘　　要

In this work, gamma-MnS/reduced graphene oxide composites (gamma-MnS/rGO) were prepared using. a facile one-pot hydrothermal method. As an electrode material for supercapacitors, the gamma-MnS/rGO-60 composite obtained under dosages of graphene oxide. was 60 mg and. exhibited an enhanced specific capacitance of 547.6 F g(-1) at a. current density of 1 A g(-1), and outstanding rate capability (65% capacitance retention at 20 A g(-1)), with superior cycling stability and electrochemical reversibility. An asymmetric supercapacitor assembled from gamma-MnS/rGO-60 composite and rGO (gamma-MnS/rGO-60//rGO) showed. a voltage window of 0-1.6 V and. delivered a high energy density of 23.1 Wh kg(-1) at a power density of 798.8 W kg(-1), and 15.9 Wh kg(-1) at 4.5 kW kg(-1). Moreover, two such 1.0 x 1.0 cm(2) devices connected together in series easily light up a group of LED lights, showing. its potential practical. application as an attractive energy storage device.