Three-dimensional reduced graphene oxide anchored MoS2@C core-shell nanoparticles as high performance materials in supercapacitor application

Abstract

Three-dimensional (3D) reduced graphene oxide (rGO) anchored carbon-coated MoS2 core-shell nanoparticles (MoS2@C-rGO) has been developed successfully through a simple one-pot hydrothermal process. The 3D MoS2@C-rGO nanocomposite consists of carbon coated MoS2 nanoparticle clusters (MoS2@C) and rGO nanosheets. The homogenously distributed and intercalated MoS2@C nanoparticles between rGO nanosheets form a highly conductive 3D carbon network with rGO, and present a hierarchical pore size structure, enabling fast ion and electron transport, as well as remarkable specific surface area. The 3D MoS2@C-rGO demonstrates an extraordinary specific capacitance of 1105 Fg−1 when subjected to a current density of 1 Ag−1. The 3D MoS2@C-rGO is also exceptionally cycle-stable, as demonstrated by the fact that it retains 96.3 % of its initial capacitance even after 5000 cycling cycles at 1 Ag−1. This symmetric supercapacitor is made with electrodes that are composed of MoS2@C-rGO, and it has a power density of 16.7 kW kg−1 and a specific capacitance of 405 Fg−1 at a current density of 1 Ag−1. Because of these properties, high-performance supercapacitors might benefit from having their electrodes made out of 3D MoS2@C-rGO.