One-pot facile methodology to synthesize MoS2-graphene hybrid nanocomposites for supercapacitors with improved electrochemical capacitance

Abstract

In this study, we use a facile one-pot chemical method to prepare MoS2 and MoS2-graphene hybrid nanostructures. Structural formation is confirmed by transmission electron microscopy and scanning electron microscopy. Furthermore, the refined d-spacing values using transmission electron micrograph for graphene and MoS2 are analyzed. The MoS2 and MoS2-graphene hybrid sheet based electrodes reveal a specific capacitance of 175 and 756 F.g(-1), respectively, at 0.5 A.g(-1), and the MoS2-graphene supercapacitor retains 88% of the primary capacitance after 10000 cycles. Pure MoS2 exhibits low performance with an electric double-layer capacitive behavior, whereas MoS2-graphene hybrid sheets demonstrate superior storage performance with a pseudo electric double-layer capacitive behavior. The observed maximum energy density of the MoS2-graphene supercapacitor device is 26.6 Wh.g(-1) at a power density of 125 W.kg(-1). The substantially enhanced electrochemical performance of MoS2-graphene hybrid sheets may be ascribed to the synergistic effects of MoS2 and graphene.