Edge‐Free Graphene‐Derived Mesoporous Carbon for High‐Voltage Supercapacitors

The increasing demand for high‐performance energy storage systems underscores the importance of supercapacitors, which are noted for their rapid charge–discharge capabilities and outstanding cycle stability. Nevertheless, their broader application is limited by intrinsically low energy densities and a restricted operating voltage window. Herein, the scalable fabrication of edge‐free graphene‐derived mesoporous carbon (GMC) via a carbothermal shock (CTS) process that involves rapid Joule heating followed by immediate quenching is reported. The resulting GMC displays high crystallinity, interconnected mesoporosity, and a specific surface area of 2290 m 2 g − 1 , which promote efficient ion transport and charge storage. Electrochemical evaluation reveals a specific capacitance of ≈250 F g − 1 and exceptional cycling stability at 4.4 V over 10,000 cycles. Compared to conventional activated carbons, GMC achieves significantly higher specific energy (≈105 Wh kg − 1 ) and a specific power (≈1 kW kg − 1 ), without requiring expensive ionic liquid electrolytes or hybrid systems. These findings highlight the potential of CTS‐engineered GMC as a next‐generation electrode material for high‐voltage, high‐stability, and cost‐effective supercapacitor applications.