Three-Dimensional MoS₂/Graphene Hybrid Aerogel as Free-Standing, High-Performance Electrode for Supercapacitor

Abstract

Carbon materials are generally employed as supercapacitor electrodes due to their low- cost, high-chemical stability and environmental friendliness. However, the design of carbon structures with large surface area and controllable porous structure remains a daunt challenge. In this work, a three-dimensional (3D) hybrid aerogel with different contents of MoS 2 nanosheets in 3D graphene aerogel (MoS 2 -GA) was synthesized through a facial hydrothermal process. The influences of MoS 2 content on microstructure and subsequently on electrochemical properties of MoS 2 -GA are systematically investigated and an optimized mass ratio with MoS 2 : GA of 1:2 is chosen to achieve high mechanical robustness and outstanding electrochemical performance in the hybrid structure. Due to the large specific surface area, porous structure and continuous charge transfer network, such MoS 2 -GA electrodes exhibit high specific capacitance, good rate capability and excellent cyclic stability, showing great potential in large-scale and low-cost fabrication of high-performance supercapacitors.