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Issue 23, 2011
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High-performance supercapacitor electrodes based on graphene hydrogels modified with 2-aminoanthraquinone moieties

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Abstract

2-Aminoanthraquinone (AAQ) molecules were covalently grafted onto chemically modified graphene (CMG), and the AAQ functionalized CMG sheets were self-assembled into macroporous hydrogels for supercapacitor electrodes. The electrode based on the AAQ modified self-assembled graphene hydrogel (AQSGH) showed a high specific capacitance of 258 F g−1 at a discharge current density of 0.3 A g−1, which is much larger than that of a pure graphene hydrogel (193 F g−1). Furthermore, the AQSGH electrode exhibited excellent rate capability and a long cycle life. This is mainly due to the covalently bonded AAQ moieties contributing additional redox capacitance. Furthermore, the highly conductive graphene hydrogel scaffold provided a large specific surface area for forming electric double layers and convenient routes for charge transfer and electrolyte diffusion.

Graphical abstract: High-performance supercapacitor electrodes based on graphene hydrogels modified with 2-aminoanthraquinone moieties

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Supplementary files

Article information


Submitted
30 Mar 2011
Accepted
12 Apr 2011
First published
11 May 2011

Phys. Chem. Chem. Phys., 2011,13, 11193-11198
Article type
Paper

High-performance supercapacitor electrodes based on graphene hydrogels modified with 2-aminoanthraquinone moieties

Q. Wu, Y. Sun, H. Bai and G. Shi, Phys. Chem. Chem. Phys., 2011, 13, 11193
DOI: 10.1039/C1CP20980A

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