Journal
CARBON
Volume 49, Issue 2, Pages 457-467Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2010.09.042
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Funding
- MRSEC Program of the National Science Foundation [DMR 08-19762]
- Samsung Foundation of Culture
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [819762] Funding Source: National Science Foundation
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We report the making of chemically reduced graphene (CRG) sheets separated by layer-by-layer-assembled multi-walled carbon nanotubes (MWCNTs) for electrochemical micro-capacitor applications. Submicron thin films of amine-functionalized MWCNTs (MWCNT-NH2) and CRG derived from graphene oxides, were shown to be cross-linked with amide bonds having high packing densities of similar to 70%. These carbon-only electrodes were found to have large volumetric capacitance of similar to 160 F/cm(electrode)(3) in an acidic electrolyte (0.5 M H2SO4). The electrode capacitance in a neutral electrolyte (1 M KCl) was found much lower, which supported the hypothesis that the observed high capacitances in the acidic electrolyte can be attributed primarily to redox reactions between protons and surface oxygen-containing groups on carbon. (C) 2010 Elsevier Ltd. All rights reserved.
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