Synthesis of nanosized vanadium pentoxide/carbon composites by spray pyrolysis for electrochemical capacitor application

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Show simple item record Wang, B Konstantinov, K Wexler, D Liu, H Wang, G 2011-02-07T06:18:56Z 2009-01
dc.identifier.citation Electrochimica Acta, 2009, 54 (5), pp. 1420 - 1425
dc.identifier.issn 0013-4686
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract Nanostructured vanadium pentoxide/carbon (V2O5/carbon) composite powders with enhanced specific capacitance were synthesized by the spray pyrolysis technique. Electrochemical properties were examined by the cyclic voltammetry technique. Following analysis of powders sprayed at different temperatures, composite powders obtained at an optimum temperature of 450 °C yielded a maximum specific capacitance of 295 F g-1 in 2 M KCl electrolyte at a 5-mV s-1 scan rate. The weight percentage of carbon-related species was 2.7 wt% in this V2O5/carbon composite, as detected by thermogravimetric analysis (TGA) and confirmed by transmission electron microscope energy dispersive spectroscopy (TEM-EDS) analysis. Following initial X-ray diffraction (XRD) characterization, scanning electron microscope (SEM), TEM and high-resolution TEM (HRTEM) imaging revealed a specific morphology of spherical shell agglomerates of V2O5 nanorods and nanoribbons, with each shell comprising a network of these one- and two-dimensional nanoparticles in an amorphous carbon matrix. The V2O5 network was not fully dense, and the majority of the nanorod sizes were in the range of 50150 nm, with additional long nanoribbons extending from the outsides of the spherical shells. The specific surface area was 18 m2 g-1 for the composite powders, and the pore size distribution revealed that the majority of pores had diameters in the range of 4050 Å, which was relatively larger than the pore diameters obtained at 500 °C and would be beneficial for electrochemical performance. The enhancement of the specific capacitance in V2O5/carbon composites was attributed to the distribution of amorphous carbon throughout the V2O5 and the particular open nanostructure.
dc.publisher Pergamon
dc.relation.isbasedon 10.1016/j.electacta.2008.09.028
dc.title Synthesis of nanosized vanadium pentoxide/carbon composites by spray pyrolysis for electrochemical capacitor application
dc.type Journal Article
dc.parent Electrochimica Acta
dc.journal.volume 5
dc.journal.volume 54
dc.journal.number 5 en_US
dc.publocation United Kingdom en_US
dc.identifier.startpage 1420 en_US
dc.identifier.endpage 1425 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0306 Physical Chemistry (Incl. Structural)
dc.for 0204 Condensed Matter Physics
dc.personcode 109499
dc.personcode 114558
dc.personcode 113451
dc.percentage 50 en_US Physical Chemistry (incl. Structural en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords Electrochemical capacitor
dc.description.keywords Composites
dc.description.keywords Vanadium pentoxide
dc.description.keywords Spray pyrolysis
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - Materials and Technology for Energy Efficiency
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
utslib.collection.history School of Chemistry and Forensic Science (ID: 339)
utslib.collection.history Closed (ID: 3)

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