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Show simple item record Khawula, TNY Raju, Kumar Franklyn, PJ Sigalas, I Ozoemena, KI 2017-07-28T09:09:19Z 2017-07-28T09:09:19Z 2016-03
dc.identifier.citation Khawula, T.N.Y., Raju, K., Franklyn, P.J. et al. 2016. Symmetric pseudocapacitors based on molybdenum disulfide (MoS2)-modified carbon nanospheres: correlating physicochemistry and synergistic interaction on energy storage. Journal of Materials Chemistry A, vol. 4(17): 6411-6425. DOI: 10.1039/C6TA00114A en_US
dc.identifier.issn 2050-7488
dc.identifier.uri DOI:10.1039/C6TA00114A
dc.description Copyright: 2016 RSC. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, kindly consult the publisher's website. en_US
dc.description.abstract Molybdenum disulfide-modified carbon nanospheres (MoS(sub2)/CNS) with two different morphologies (spherical and flower-like) have been synthesized using hydrothermal techniques and investigated as symmetric pseudocapacitors in an aqueous electrolyte. The physicochemical properties of these MoS(sub2)/CNS layered materials have been investigated using surface area analysis (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman, Fourier transform infrared (FTIR) spectroscopy, and advanced electrochemistry, including cyclic voltammetry (CV), galvanostatic cycling with potential limitation (GCPL), long-hour voltage-holding tests, and electrochemical impedance spectroscopy (EIS). The two different MoS(sub2)/CNS layered materials exhibit unique differences in morphology, surface area, and structural parameters, which have been correlated with their electrochemical capacitive properties. The flower-like morphology (f-MoS(sub2)/CNS) shows lattice expansion (XRD), large surface area (BET analysis), and small-sized nanostructures (corroborated by the larger FWHM of the Raman and XRD data). In contrast to the f-MoS(sub2)/CNS, the spherical morphology (s-MoS(sub2)/CNS) shows lattice contraction and small surface area with relatively large-sized nanostructures. The presence of CNS on the MoS(sub2) structure leads to slight softening of the characteristic Raman bands (E12g and A1g modes) with larger FWHM. MoS(sub2) and its CNS-based composites have been tested in symmetric electrochemical capacitors in an aqueous 1 M Na(sub2)SO(sub4) solution. CNS improves the conductivity of the MoS(sub2) and synergistically enhances the electrochemical capacitive properties of the materials, especially the f-MoS2/CNS-based symmetric cells (most notably, in terms of capacitance retention). The f-MoS(sub2)/CNS-based pseudocapacitor shows a maximum capacitance of 231 F g(sup-1), with high energy density 26 W h kg(sup-1) and power density 6443 W kg(sup-1). For the s-MoS(sub2)/CNS-based pseudocapacitor, the equivalent values are 108 F g(sup-1), 7.4 W h kg(sup-1) and 3700 W kg(sup-1). The high-performance of the f-MoS(sub2)/CNS is consistent with its physicochemical properties as determined by the spectroscopy and microscopy data. These findings have opened doors for further exploration of the synergistic effects between MoS(sub2) graphene-like sheets and CNS for energy storage. en_US
dc.language.iso en en_US
dc.publisher Royal Society of Chemistry en_US
dc.relation.ispartofseries Worklist;17826
dc.subject Supercapacitor en_US
dc.subject Molybdenum disulfide-modified carbon nanospheres en_US
dc.subject MoS(sub2)/CNS en_US
dc.title Symmetric pseudocapacitors based on molybdenum disulfide (MoS2)-modified carbon nanospheres: correlating physicochemistry and synergistic interaction on energy storage en_US
dc.type Article en_US

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