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Direct conversion of CO to meso/macro-porous frameworks of surface-microporous graphene for efficient asymmetrical supercapacitors

Journal of Materials Chemistry A, ISSN: 2050-7496, Vol: 5, Issue: 44, Page: 23252-23258
2017
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CO 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 COvia its one-step exothermic reaction with potassium. Furthermore, the MFSMG electrode exhibited a high gravimetric capacitance of 178 F g at 0.2 A g 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 for MFSMG and 97.4 F g for AC. With the extended potential, the asymmetrical capacitor achieved an improved energy density of 9.43 W h kg and a power density of 3504 W kg. This work provides a novel solution to solve the CO issue and creates an efficient electrode material for supercapacitors.

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