H2O2-assisted microwave synthesis of NiO/CNT nanocomposite material for supercapacitor applications

NiO nanoflakes anchored on carbon nanotubes (CNTs) were fabricated through a H 2 O 2 -assisted microwave irradiation method. The formation of the NiO/CNT nanocomposites were characterised by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR), micro Raman spectroscopy an...

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Bibliographic Details
Published in:Ionics 2020-08, Vol.26 (8), p.4067-4079
Main Authors: Sannasi, Veeman, Maheswari, K. Uma, Karthikeyan, C., Karuppuchamy, S.
Format: Article
Language:English
Subjects:
Aqueous electrolytes
Capacitance
Carbon nanotubes
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Current density
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrochemistry
Electrons
Energy Storage
Fourier transforms
Hydrogen peroxide
Infrared spectroscopy
Morphology
Nanocomposites
Nickel oxides
Optical and Electronic Materials
Original Paper
Photoelectrons
Raman spectroscopy
Renewable and Green Energy
Spectroscopic analysis
Spectrum analysis
Synergistic effect
X ray photoelectron spectroscopy
X ray powder diffraction
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Summary:NiO nanoflakes anchored on carbon nanotubes (CNTs) were fabricated through a H 2 O 2 -assisted microwave irradiation method. The formation of the NiO/CNT nanocomposites were characterised by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR), micro Raman spectroscopy and X-ray photoelectron spectroscopy. Surface morphology studies of the prepared materials were carried out using scanning and transmission electron microscopy (SEM and TEM). The electrochemical performance of the NiO and NiO/CNTs were analysed by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques. GCD studies of the NiO/CNTs reveal a maximum specific capacitance of 258 F/g at 1 A/g current density in 2 M KOH aqueous electrolyte was achieved for 1:1 ratio of NiO/CNTs composite. Further, a specific capacitance of 258 F/g at 1 A/g current density obtained for 1:1 ratio of NiO/CNTs is almost 2.15 times higher than that of prepared NiO (120 F/g) which indicates an excellent synergistic effect in NiO/CNTs nanocomposite. Furthermore, the NiO/CNTs nanocomposite electrode showed outstanding cycling stability retention of 86% of the initial capacitance after 2500 cycles. Graphical abstract
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-020-03563-z