▎ 摘　　要

A three-dimensional graphene network (3DGN) grown on nickel foam is an excellent template for the synthesis of graphene-based composite electrodes for use in supercapacitors. Ni(OH)(2) nanosheets coated onto single-crystal Ni3S2 nanorods grown on the surface of the 3DGN (referred to as the Ni3S2@Ni(OH)(2)/3DGN) are synthesized using a one-step hydrothermal reaction. SEM, TEM, XRD and Raman spectroscopy are used to investigate the morphological and structural evolution of the Ni3S2@Ni(OH)(2)/3DGN. Detailed electrochemical characterization shows that the Ni3S2@Ni(OH)(2)/3DGN exhibits high specific capacitance (1277 F g(-1) at 2 mV s(-1) and 1037.5 F g(-1) at 5.1 A g(-1)) and areal capacitance (4.7 F cm(-2) at 2 mV s(-1) and 3.85 F cm(-2) at 19.1 mA cm(-2)) with good cycling performance (99.1% capacitance retention after 2000 cycles).