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Title: A high-energy-density supercapacitor with graphene-CMK-5 as the electrode and ionic liquid as the electrolyte
Authors: Lei, Z.
Liu, Z.
Wang, H.
Sun, X.
Lu, L. 
Zhao, X.S.
Issue Date: 14-Feb-2013
Citation: Lei, Z., Liu, Z., Wang, H., Sun, X., Lu, L., Zhao, X.S. (2013-02-14). A high-energy-density supercapacitor with graphene-CMK-5 as the electrode and ionic liquid as the electrolyte. Journal of Materials Chemistry A 1 (6) : 2313-2321. ScholarBank@NUS Repository.
Abstract: A graphene-based supercapacitor electrode suitable for ionic liquid electrolytes was designed and prepared based on the electrostatic interactions between negatively charged graphene oxides (GO) and positively charged mesoporous carbon CMK-5 platelets. Thermal annealing of the GO-CMK-5 composite under an inert atmosphere yielded a hierarchical carbon nanostructure with CMK-5 platelets uniformly intercalated between the GO sheets. The electrochemical results demonstrated that the CMK-5 platelets with straight and short mesochannels served as a highway for the fast transport of electrolyte ions, while the separated graphene sheets with more exposed electrochemical surface area favored the formation of electrical double layer capacitance. The RGO-CMK-5 electrode exhibited a specific capacitance of 144.4 F g-1 in 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid electrolyte, which can be charged/discharged at an operating voltage of 3.5 V. As a result, an energy density of 60.7 W h kg-1 and a power density as high as 10 kW kg-1 were achieved, which outperforms most of the present graphene-based supercapacitors. Moreover, the superior rate performance together with the excellent cycle performance makes the RGO-CMK-5 composite a promising candidate for next generation supercapacitor electrodes. This journal is © The Royal Society of Chemistry 2013.
Source Title: Journal of Materials Chemistry A
ISSN: 20507488
DOI: 10.1039/c2ta01040b
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