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Graphene-like carbide derived carbon for high-power supercapacitors

Gao, Peng-Cheng and Tsai, Wan-Yu and Daffos, Barbara and Taberna, Pierre-Louis and Pérez, Carlos R. and Gogotsi, Yury and Simon, Patrice and Favier, Frédéric Graphene-like carbide derived carbon for high-power supercapacitors. (2015) Nano Energy, 12. 197-206. ISSN 2211-2855

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Official URL: http://dx.doi.org/10.1016/j.nanoen.2014.12.017

Abstract

Two graphene-like carbide derived carbons (CDC-Gs) were produced by chlorination of SiC nanosheets obtained by magnesio-thermal reduction at moderate temperature of silica/graphene oxide nanocomposites. These CDC-Gs were evaluated as supercapacitor electrode materials in an organic electrolyte. Starting from a low SiO2/GO ratio in the precursor, the resulting CDC-G nanosheets are composed of a few layers of graphite, partially coated with microporous CDC. In contrast, a high SiO2/GO ratio leads to micropores generated on the basal plane of individual carbon nanosheets. The latter CDC-G shows a remarkable high power capability with 76 % of retention of the initial capacity at scan rates up to 3 V s-1. Notably, the equivalent series resistance (ESR) and time constant of the cell were found to be extremely low at 0.45 Ω cm2 and 0.4 s, respectively, thanks to the unique 2D open surface and enhanced access to micropores. These features were attributed to the unique nanostructure of the microporous graphene.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Drexel University (USA)
Other partners > Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
Funders:
European Research Council
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Deposited By: cirimat webmestre
Deposited On:27 Jan 2017 14:57

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