▎ 摘　　要

Graphene quantum dot-decorated porous carbon spheres were synthesizedviaa facile and green route in this study. The presence of graphene quantum dots modified the conductivity of the resultant materials. Moreover, the obtained self-doped heteroatom carbon material demonstrated a high specific surface area of up to 1393.9 m(2)g(-1). Based on the above merits, the obtained composites reveal superior electrochemical performance for energy storage. The specific capacitance of the composite-based single electrode and assembled flexible solid-state supercapacitors was found to be 237.3 F g(-1)and 244.5 mF cm(-2), respectively. Meanwhile, the device's energy density can reach 21.7 mu W h cm(-2)at a power density of 674.5 mu W cm(-2). Impressively, despite the device's power density of 8000 mu W cm(-2), the energy density still remains at 18.8 mu W h cm(-2). In addition, the assembled device delivers outstanding flexibility. Even after the device is bent at 154.4 degrees, the energy density maintains a value of 13.7 mu W h cm(-2). In brief, a feasible reference for the preparation of functional carbon materials for high-performance energy storage devices was presentedviaa high efficiency, low cost, and green route.