▎ 摘　　要

CO2 conversion to useful materials is the most attractive approach to control its content in the atmosphere. An ideal electrode material for supercapacitors should possess suitable meso/macro-pores as electrolyte reservoirs and rich micro-pores as places for the adsorption of electrolyte ions. Herein, we designed and synthesized such an ideal material, meso/macro-porous frameworks of surface-microporous graphene (MFSMG), from CO2 via its one-step exothermic reaction with potassium. Furthermore, the MFSMG electrode exhibited a high gravimetric capacitance of 178 F g(-1) at 0.2 A g(-1) in 2 M KOH and retained 85% capacitance after increasing current density by 50 times. The combination of the MFSMG electrode and the activated carbon (AC) electrode constructed an asymmetrical AC//MFSMG capacitor, leading to a high capacitance of 242.4 F g(-1) for MFSMG and 97.4 F g(-1) for AC. With the extended potential, the asymmetrical capacitor achieved an improved energy density of 9.43 W h kg(-1) and a power density of 3504 W kg(-1). This work provides a novel solution to solve the CO2 issue and creates an efficient electrode material for supercapacitors.