Thin films of carbon nanotubes and chemically reduced graphenes for electrochemical micro-capacitors

[Display omitted] ► Carbon-only thin films of chemically reduced graphene (CRG) sheets separated by layer-by-layer assembled multi-walled carbon nanotubes have high packing density. ► These thin films show high volumetric capacitances in acid, which can be attributed to electrochemical double layer...

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Bibliographic Details
Published in:Carbon (New York) 2011-02, Vol.49 (2), p.457-467
Main Authors: Byon, Hye Ryung, Lee, Seung Woo, Chen, Shuo, Hammond, Paula T., Shao-Horn, Yang
Format: Article
Language:English
Subjects:
amides
amines
Capacitance
Carbon
carbon nanotubes
chemical concentration
chemical reduction
Chemistry
Cross-disciplinary physics: materials science
rheology
crosslinking
Electrochemistry
Electrodes
Electrolytes
Exact sciences and technology
films (materials)
Fullerenes and related materials
diamonds, graphite
General and physical chemistry
Graphene
Materials science
Oxides
oxygen
Physics
potassium chloride
protons
Specific materials
sulfuric acid
surfaces
Thin films
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Summary:[Display omitted] ► Carbon-only thin films of chemically reduced graphene (CRG) sheets separated by layer-by-layer assembled multi-walled carbon nanotubes have high packing density. ► These thin films show high volumetric capacitances in acid, which can be attributed to electrochemical double layer capacitance and redox reactions between protons and surface oxygen-containing groups on CRG. 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-NH 2) and CRG derived from graphene oxides, were shown to be cross-linked with amide bonds having high packing densities of ∼70%. These carbon-only electrodes were found to have large volumetric capacitance of ∼ 160 F/cm electrode 3 in an acidic electrolyte (0.5 M H 2SO 4). 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.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2010.09.042