Journal
NANO ENERGY
Volume 12, Issue -, Pages 197-206Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2014.12.017
Keywords
2D carbide; Graphene; Microporous CDC; High power supercapacitor; Organic electrolyte
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Funding
- Chinese Scientific Council
- European Research Council (ERC, Advanced Grant) [ERC-2011-AdG, 291543]
- Chair of Excellence of the EADS foundation
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science [DESC0001912]
- Partnership University Fund (PUF)
- European Research Council (ERC) [291543] Funding Source: European Research Council (ERC)
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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 Omega.cm(2) 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. (C) 2014 Elsevier Ltd. All rights reserved.
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