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

Abstract

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