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Free-standing Ni3(VO4)2 nanosheet arrays on aminated r-GO sheets for supercapacitor applications
R. Kumar, , P. Rai, A. Sharma
Published in Royal Society of Chemistry
2018
Volume: 42
   
Issue: 2
Pages: 1243 - 1249
Abstract
Ni3(VO4)2 nanosheet arrays are grown on aminated r-GO sheets through a facile hydrothermal route. The growth of Ni3(VO4)2 nanosheet arrays on aminated r-GO sheets (NiV@r-GO nanocomposites) is confirmed by XRD, FESEM, TEM, XPS, and Raman spectroscopy. The length, height and thickness of the Ni3(VO4)2 nanosheet arrays are ∼100, ∼20 and ∼10 nm, respectively. The density of the Ni3(VO4)2 nanosheet arrays on the r-GO sheets is directly related to the concentration of precursor used. The generation of mesoporosity during synthesis originates from the high surface area in the NiV@r-GO nanocomposites. The high surface area causes the mesoporous NiV@r-GO nanocomposite based electrode to exhibit a specific capacity of 170 C g-1 at 0.5 A g-1, which is approximately three times higher than that of aminated r-GO sheets. The capacity retention of the NiV@r-GO nanocomposite is 97.2% at 0.5 A g-1 current density after 1400 cycles. Other than the faradic redox reaction, the superior electrochemical performance of NiV@r-GO nanocomposites over the aminated r-GO sheet based electrode is related to the three-dimensional (3D) morphology as an effect of the Ni3(VO4)2 nanosheet array, which results in a higher surface area, more active sites and greater electrolyte penetration in the electrode. © 2018 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
About the journal
JournalData powered by TypesetNew Journal of Chemistry
PublisherData powered by TypesetRoyal Society of Chemistry
ISSN11440546