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Title: Incorporation of MnO 2-coated carbon nanotubes between graphene sheets as supercapacitor electrode
Authors: Lei, Z. 
Shi, F.
Lu, L. 
Keywords: carbon nanotubes
graphene-based composite
MnO 2
supercapacitor electrode
Issue Date: 22-Feb-2012
Citation: Lei, Z., Shi, F., Lu, L. (2012-02-22). Incorporation of MnO 2-coated carbon nanotubes between graphene sheets as supercapacitor electrode. ACS Applied Materials and Interfaces 4 (2) : 1058-1064. ScholarBank@NUS Repository.
Abstract: Hierarchical graphene-based composite consisting of graphene sheets intercalated by MnO 2-coated carbon nanotubes (MnC) was prepared for high-performance supercapacitor electrode. The highly negatively charged graphene oxides reduced by urea (RGO) and the positively charged MnC functionalized with poly(diallyldimethylammonium chloride) created a strong electrostatic interaction, forming a hierarchical nanostructure. The elelctrocapacitive behaviors of MnC/RGO (MnC-G) were systematically investigated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. A maximum specific capacitance of 193 F/g was achieved for the MnC-G composite with 37% RGO, which was almost 3-fold higher than 69 F/g of carbon nanotubes/RGO and 2-fold higher than 89 F/g of MnO 2/RGO composite. Moreover, an excellent rate performance, a good capacitance retention (∼70%) and a superior Coulombic efficiency (94-96%) were also observed during the continuous 1300 cycles of galvanostatic charge-discharge. © 2012 American Chemical Society.
Source Title: ACS Applied Materials and Interfaces
ISSN: 19448244
DOI: 10.1021/am2016848
Appears in Collections:Staff Publications

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