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Issue 37, 2013
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A novel core–shell multi-walled carbon nanotube@graphene oxide nanoribbon heterostructure as a potential supercapacitor material

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Abstract

A novel core–shell heterostructure with multi-walled carbon nanotubes as the core and graphene oxide nanoribbons as the shell (MWCNT@GONR), fabricated by the facile unzipping of MWCNTs with the help of microwave energy, was used as a supercapacitor (SC) electrode material. Graphene nanopowder (GNP) and multi-walled carbon nanotubes (MWCNTs) have also been applied as SC materials for comparison. A smooth surface and a tube-like structure are found for the GNP and MWCNTs, respectively, while for the MWCNT@GONR material, graphene oxide sheet structures are observed on both sides of central nanotube cores that retain their tube-like structure. The specific capacitance is much better for the SC electrode with the MWCNT@GONR (252.4 F g−1) compared to the SC electrodes with commercial MWCNTs (39.7 F g−1) and GNP (19.8 F g−1), as determined using cyclic voltammetry (CV) at a scan rate of 50 mV s−1, which is due to the defective edges of the nanostructures in the former. The SC electrode with the MWCNT@GONR also exhibits good stability and capacitance retention even after 1000 cycles of galvanostatic charge–discharge testing, indicating its potential as a SC material. CV, galvanostatic charge–discharge (GC/D) and electrochemical impedance spectroscopy (EIS) were applied to analyze the SC performance.

Graphical abstract: A novel core–shell multi-walled carbon nanotube@graphene oxide nanoribbon heterostructure as a potential supercapacitor material

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Publication details

The article was received on 23 May 2013, accepted on 10 Jul 2013 and first published on 10 Jul 2013


Article type: Paper
DOI: 10.1039/C3TA12037F
Citation: J. Mater. Chem. A, 2013,1, 11237-11245
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    A novel core–shell multi-walled carbon nanotube@graphene oxide nanoribbon heterostructure as a potential supercapacitor material

    L. Lin, M. Yeh, J. Tsai, Y. Huang, C. Sun and K. Ho, J. Mater. Chem. A, 2013, 1, 11237
    DOI: 10.1039/C3TA12037F

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