Enhanced electrochemical studies of ZnO/CNT nanocomposite for supercapacitor devices

ZnO nanorods embedded on functionalized CNT have been synthesised by the chemical refluxing method. The characterization results revealed the tube-like structure of carbon nanotubes, that expose the ZnO nanorods grafted upright and parallel on the floor across the CNT surface. The powder X-ray diffr...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2019-09, Vol.568, p.51-59
Main Authors: Ranjithkumar, R., Arasi, S. Ezhil, Sudhahar, S., Nallamuthu, N., Devendran, P., Lakshmanan, P., Kumar, M. Krishna
Format: Article
Language:English
Subjects:
Carbon nanotubes
Chemical synthesis
Conventional chemical reflux
Crystal structure
Diffraction patterns
Electrochemical studies
Energy storage devices
Nanocomposites
Nanorods
Nanotubes
Organic chemistry
Raman spectroscopy
Refluxing
Supercapacitor
X ray powder diffraction
Zinc oxide
Zinc oxides
ZnO/CNT
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Summary:ZnO nanorods embedded on functionalized CNT have been synthesised by the chemical refluxing method. The characterization results revealed the tube-like structure of carbon nanotubes, that expose the ZnO nanorods grafted upright and parallel on the floor across the CNT surface. The powder X-ray diffraction patterns show that crystalline ZnO nanorods are highly loaded on the surface of CNT and formed as a nano-composite. Raman spectroscopy results showed that the intensity of D and G bands decreased due to the loading of ZnO nanorods. Cyclic voltammetry curves reveal the double layer capacitor (EDLC) behaviour of ZnO/CNT. The synthesised hybrid ZnO/CNT exhibits a high specific capacitance (SPc) of 189 Fg-1. The quick charge-discharge performance was found about 95 Fg-1 and the cyclic stability of 96% was observed for 1000 cycles. ZnO/CNT nano-composites also exhibit a high power density of 2250 W kg-1. •Uniform shape and size ZnO nanorod decorated on functionalized CNT was synthesised.•Electrochemical behaviour of ZnO/CNT was studied (CV, GCD and ESI) in Na2SO4 electrolyte.•EDLC specific capacitance was found to be 189 F/g at 1 mVs−1.•High power density of 2250 W/Kg with energy density of 10.7 Wh/Kg was found.•Cyclic life with retention of capacitance was found about 96% after 1000 cycles.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2019.05.025