Issue 42, 2014

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

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 kg−1) by facile, non-covalent surface modification with anthraquinone (AQ). AQ provides battery-like redox charge storage (927 C g−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

Supplementary files

Article information

Article type
Paper
Submitted
14 7 2014
Accepted
11 9 2014
First published
23 9 2014

J. Mater. Chem. A, 2014,2, 17764-17770

Author version available

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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