Two-dimensional MoS2-based composite has remarkable potential as an electrode material for advanced energy storage. However, the application of MoS2 is limited by its low electrical conductivity and cyclic stability. Herein, a novel three/two-dimensional (3D/2D) ternary nanostructured consisting MoS2/g-C3N4/reduced graphene oxide (rGO), denoted MCNG, synthesized using in-situ sonochemical-assis...