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

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.