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AuthorDawoud H.D.
AuthorAl Tahtamouni T.
AuthorBensalah N.
Available date2020-04-16T06:56:47Z
Publication Date2019
Publication NameInternational Journal of Energy Research
ResourceScopus
ISSN0363907X
URIhttp://dx.doi.org/10.1002/er.4364
URIhttp://hdl.handle.net/10576/14230
AbstractIn this work, flexible carbon nanotubes (CNTs)/manganese oxide (MnO2) composite electrode was fabricated by direct deposition of MnO2 nanoparticles on CNTs sheet by RF magnetron sputtering. The surface morphology and microstructure of the CNTs and CNTs/MnO2 composite electrodes were characterized by X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. It was found that 1-m thick MnO2 film covered the surface of CNTs sheet with MnO2 mass loading of 0.125mg/cm2. CNTs/MnO2 composite was tested as electrode materials for supercapacitors in sulfate media (1-M H2SO4 and Na2SO4) by cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD). The results obtained showed that CNTs/MnO2 composite electrode displayed good electrochemical performance in 1-M Na2SO4, while the chemical stability of MnO2 film was highly affected due its dissolution in acidic medium. A specific capacitance of 940 F/g was retained (with a capacitance retention of about 80%) after 3000 GCD cycles. CNTs/MnO2 all-solid symmetric supercapacitor using PVA/H3PO4 gel electrolyte exhibited an initial specific capacitance 80F/g and decreased by 25% after 3000 cycles.
SponsorThis work was partially funded by Qatar University from an internal grant number QUUG-CAS-CES-14/15/11. The authors also acknowledge the support from Qatar University under GCC Research Program GCC 2017-007.
Languageen
PublisherJohn Wiley and Sons Ltd
Subjectcarbon nanotubes
manganese oxide
pseudocapacitance
RF magnetron sputtering
supercapacitor
TitleSputtered manganese oxide thin film on carbon nanotubes sheet as a flexible and binder-free electrode for supercapacitors
TypeArticle
Pagination1245-1254
Issue Number3
Volume Number43
dc.accessType Abstract Only


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