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Issue 44, 2017
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Direct conversion of CO2 to meso/macro-porous frameworks of surface-microporous graphene for efficient asymmetrical supercapacitors

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Abstract

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 CO2via 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.

Graphical abstract: Direct conversion of CO2 to meso/macro-porous frameworks of surface-microporous graphene for efficient asymmetrical supercapacitors

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Publication details

The article was received on 08 Aug 2017, accepted on 11 Oct 2017 and first published on 11 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07003A
Citation: J. Mater. Chem. A, 2017,5, 23252-23258
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    Direct conversion of CO2 to meso/macro-porous frameworks of surface-microporous graphene for efficient asymmetrical supercapacitors

    L. Chang, D. J. Stacchiola and Y. H. Hu, J. Mater. Chem. A, 2017, 5, 23252
    DOI: 10.1039/C7TA07003A

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