Solid-state shear pan-milling synthesis of high-performance MoS2/graphene nanocomposites for supercapacitors

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MoS 2 /graphene composites are considered as promising electrode materials for the application in high-performance supercapacitors. The innovation of this study lies in the first-time application of solid-state shear pan-milling (S 3 M) technology to fabricate MoS 2 /graphene composite electrodes with varying MoS 2 mass ratios (MG-20%, MG-40%, MG-50%, MG-60% and MG-80%), using MoS 2 nanosheets and flake graphite as raw materials. Cyclic voltammetry and galvanostatic charge–discharge measurements were employed to evaluate the electrochemical performance of the composites. At a current density of 1 A/g, the MG-20% composite exhibited a specific capacitance of 359 F/g and retained 91.82% of its initial capacitance after 10,000 charge–discharge cycles. Furthermore, the asymmetric supercapacitor device assembled with MG-20% as the positive electrode and activated carbon as the negative electrode exhibited a high capacitance retention of 83.31% after 10,000 charge–discharge cycles and a high energy density of 16.7 Wh/kg at a power density of 0.69 kW/kg. The findings reveal that the S 3 M method enables effective structural integration of MoS₂/graphene composites, a critical advancement for high-performance supercapacitor electrode materials. This approach combines exceptional electrochemical properties with an environmentally benign and scalable synthesis process.