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Issue 42, 2014
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Battery/supercapacitor hybrid via non-covalent functionalization of graphene macro-assemblies

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Abstract

Binder-free, monolithic, high surface area graphene macro-assemblies (GMAs) are promising materials for supercapacitor electrodes, but, like all graphitic carbon based supercapacitor electrodes, still lack sufficient energy density for demanding practical applications. Here, we demonstrate that the energy storage capacity of GMAs can be increased nearly 3-fold (up to 23 W h kgāˆ’1) by facile, non-covalent surface modification with anthraquinone (AQ). AQ provides battery-like redox charge storage (927 C gāˆ’1) without affecting the conductivity and capacitance of the GMA support. The resulting AQ-GMA battery/supercapacitor hybrid electrodes demonstrate excellent power performance, show remarkable long-term cycling stability and, by virtue of their excellent mechanical properties, allow for further increases in volumetric energy density by mechanical compression of the treated electrode. Our measured capacity is very close to the theoretical maximum obtained using detailed density functional theory calculations, suggesting nearly all incorporated AQ is made available for charge storage.

Graphical abstract: Battery/supercapacitor hybrid via non-covalent functionalization of graphene macro-assemblies

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Publication details

The article was received on 14 Jul 2014, accepted on 11 Sep 2014 and first published on 23 Sep 2014


Article type: Paper
DOI: 10.1039/C4TA03605K
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Citation: J. Mater. Chem. A, 2014,2, 17764-17770
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    Battery/supercapacitor hybrid via non-covalent functionalization of graphene macro-assemblies

    P. G. Campbell, M. D. Merrill, B. C. Wood, E. Montalvo, M. A. Worsley, T. F. Baumann and J. Biener, J. Mater. Chem. A, 2014, 2, 17764
    DOI: 10.1039/C4TA03605K

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