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Facile Synthesis of Cobalt Oxide Uniformly Coated on Multi-Wall Carbon Nanotubes for Supercapacitors

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Abstract:

The composite electrodes of cobalt oxide and multi-wall carbon nanotubes (MWCNTs) are prepared by a simple low-temperature solid-phase synthesis method with the assistance of polyethylene glycol and their pseudocapacitive performances are investigated in alkaline solution by cyclic voltammetry and galvanostatic charge/discharge tests, respectively. Transmission electron microscope images show that cobalt oxide is uniformly coated on multi-wall carbon nanotubes and the homogeneous hybrid nanostructure are considered to be responsible for their preferable electrochemical performances. The electrochemical tests further reveal that the composite can deliver a maximum specific capacitance of 217 F/g with a biggest utilization of Co element when the content of MWCNTs increases to 50 wt.%.

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Periodical:

Advanced Materials Research (Volumes 306-307)

Pages:

1148-1152

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.306-307.1148

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Online since:

August 2011

Authors:

Liang Yu Gong, Ling Hao Su

Keywords:

Cobalt Oxide, Multi-Walled Carbon Nanotube (MWCNT), Super-Capacitor (SC), Uniform Coating

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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