Cu₂S/MoS₂ Nanospheres on Conductive\nMolecule Modified Reduced Graphene Oxide for Supercapacitors

Abstract

MoS₂ has an attractive two-dimensional (2D)\nflake structure,\nwhich provides a large surface area and high inherent fast ionic conductivity\nfor double-layer charge storage; thus, it is a promising electrode\nmaterial. However, 2D materials often suffer from the problem of easy\nstacking, which greatly weakens the inherent advantages of materials.\nDesigning MoS₂ into flower morphology with a large specific\nsurface area and combining it with graphene are feasible methods to\nsolve the stacking drawback of MoS₂ nanosheets for practical\napplications. The conductive molecule’s (CM) phenyl group and\npyrene group form an angle of 33.2°, which is used to obliquely\nsupport the graphene layer to obtain graphene compounds with a larger\nspecific surface area. Then Cu₂S/MoS₂ nanospheres\nare generated on the surface of the modified material to afford Cu₂S/MoS₂@CM@rGO. Here, we designed and constructed\nCu₂S/MoS₂@CM@rGO composite as electrode materials\nfor a battery-type supercapacitor. An ASC device assembled with Cu₂S/MoS₂@CM@rGO with AC (active carbon) shows a power\ndensity of 981.8 W kg^–1 under 36.9 Wh kg^–1 energy density. Significantly, a tiny light bulb can be kept lit\nfor 3 min when two solid-state ASCs are coupled in series, which demonstrates\nthe high potential of Cu₂S/MoS₂@CM@rGO for use\nin energy storage.