Synergistic Effect in an Edge‐Functionalized Water‐Processable Graphene With MoS 2 Hollow Nanoflowers for a High‐Performance Supercapacitor Electrodes

The increasing global demand for sustainable energy storage solutions has spotlighted graphene‐based supercapacitors due to their high‐power density, rapid charge–discharge capabilities, and long cycle life. In this study, we report a simple hydrothermal synthesis and supercapacitor properties of a novel nanocomposite from water‐processable pulverized graphite (pGr) and molybdenum disulfide hollow nanoflowers (MoS 2 ‐HNF) via this method. The pGr, characterized by its nearly intact graphene (Gr) layers and edge‐concentrated functional groups, offers enhanced water dispersibility, unlike other Gr, and without compromising the electrochemical properties. When integrated with MoS 2 ‐HNF, the resulting pGr‐MoS 2 nanocomposite exhibits a high specific capacitance ( C sp ) (503 Fg −1 ), which is the highest to date for Gr‐MoS 2 composites, and remarkable cycling stability, retaining approximately ~ 98.8% of its initial capacitance at 5000 charge–discharge cycles. The higher C sp is attributed to the unique architecture of the pGr‐MoS 2 ‐HNF, where MoS 2 ‐HNF is mainly at the edges of pGr, which allows access to both pGr and MoS 2 surfaces, thus allowing maximum surface area and combining the advantages of pGr with the pseudocapacitive behavior of MoS 2 . The synergistic integration of pGr and MoS 2 underscores the potential of this nanocomposite as a high‐performance, scalable, and environmentally friendly electrode material.