Thin films of carbon nanotubes and chemically reduced graphenes for electrochemical micro-capacitors |
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| Authors: | Hye Ryung Byon Seung Woo Lee Shuo Chen Paula T. Hammond Yang Shao-Horn |
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| Affiliation: | aDepartment of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;bDepartment of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;cDepartment of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;dElectrochemical Energy Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA |
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| Abstract: | 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 ∼70%. These carbon-only electrodes were found to have large volumetric capacitance of  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. |
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