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

Lu Yin Lin, Min Hsin Yeh, Jin Ting Tsai, Yuan Han Huang, Chia Liang Sun*, Kuo Chuan Ho

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

92 Scopus citations

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.

Original languageEnglish
Pages (from-to)11237-11245
Number of pages9
JournalJournal of Materials Chemistry A
Volume1
Issue number37
DOIs
StatePublished - 07 10 2013

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