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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5864

Title: Supercapacitive properties of symmetry and the asymmetry two electrode coin type supercapacitor cells made from MWCNTS/nickel oxide nanocomposite
Authors: Adekunle, AS
Ozoemena, KI
Mamba, BB
Agboola, BO
Oluwatobi, OS
Keywords: MWCNT-nickel oxide nanocomposite
Electrochemical impedance
Galvanostatic charge-discharge
Symmetry
Asymmetry
Issue Date: Oct-2011
Publisher: ESG
Citation: Adekunle, AS, Ozoemena, KI, Mamba, BB, Agboola, BO and Oluwatobi, OS. 2011. Supercapacitive properties of symmetry and the asymmetry two electrode coin type supercapacitor cells made from MWCNTS/nickel oxide nanocomposite. International Journal of Electrochemical Science, vol. 6, pp 4760-4774
Series/Report no.: Workflow;8802
Abstract: Supercapacitive properties of synthesised nickel oxides (NiO) nanoparticles integrated with multi-walled carbon nanotubes (MWCNT) in a two-electrode coin cell type supercapacitor were investigated. Successful formation of the MWCNT-NiO nanocomposite was confirmed with techniques such as transmission electron microscopy (TEM), scan electron microscopy (SEM), electron dispersive X-ray spectroscopy (EDX) and X-ray diffraction spectroscopy (XRD). The supercapacitance behaviour of both the symmetry and the asymmetry MWCNT-NiO based supercapacitor in 1 M H2SO4 and 1 M Na2SO4 electrolytes was evaluated using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic constant current charge-discharge (CD) techniques. There was a good correlation between the CV and the CD specific capacitance (SC) values for the asymmetry supercapacitor. Asymmetry supercapacitor (MWCNT-NiO|H2SO4|MWCNT) gave the highest SC value of 925.9 mFcm-2 (53.9 F g-1). High SC values which are higher than most of those reported in literature were obtained. The electrodes demonstrated high stabilities with no significant changes in SC values over 1000 cycles.
Description: Copyright: 2011 ESG
URI: http://www.electrochemsci.org/papers/vol6/6104760.pdf
http://hdl.handle.net/10204/5864
ISSN: 1452-3981
Appears in Collections:General science, engineering & technology

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