Facile construction of 3D graphene/MoS2 composites as advanced electrode materials for supercapacitors

Abstract

Abstract Flower-like molybdenum disulfide (MoS 2 ) microstructures are synthesized based on three-dimensional graphene (3DG) skeleton via a simple and facile one-step hydrothermal method, aiming at constructing series of novel composite electrode materials of 3DG/MoS 2 with high electrochemical performances for supercapacitors. The electrochemical properties of the samples are evaluated by cyclic voltammetry and galvanostatic charge/discharge tests. Specifically, the optimal 3DG/MoS 2 composite exhibits remarkable performances with a high specific capacitance of 410 F g −1 at a current density of 1 A g −1 and an excellent cycling stability with ca. 80.3% capacitance retention after 10,000 continuous charge-discharge cycles at a high current density of 2 A g −1 , making it adaptive for high-performance supercapacitors. The enhanced electrochemical performances can be ascribed to the combination of 3DG and flower-like MoS 2 , which provides excellent charge transfer network and electrolyte diffusion channels while effectively prevents the collapse, aggregation and morphology change of active materials during charge-discharge process. The results demonstrate that 3DG/MoS 2 composite is one of the attractive electrode materials for supercapacitors.