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

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dc.contributor.author Wang, Bei en_US
dc.contributor.author Konstantinov, Konstantin en_US
dc.contributor.author Wexler, David en_US
dc.contributor.author Liu, Hao en_US
dc.contributor.author Wang, Guoxiu en_US
dc.contributor.editor en_US
dc.date.accessioned 2011-02-07T06:18:56Z
dc.date.available 2011-02-07T06:18:56Z
dc.date.issued 2009 en_US
dc.identifier 2009006682 en_US
dc.identifier.citation Wang Bei et al. 2009, 'Synthesis of nanosized vanadium pentoxide/carbon composites by spray pyrolysis for electrochemical capacitor application', Pergamon, vol. 54, no. 5, pp. 1420-1425. en_US
dc.identifier.issn 0013-4686 en_US
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/13118
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 50?150 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 40?50 ?, 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. en_US
dc.language en_US
dc.publisher Pergamon en_US
dc.relation.isbasedon http://dx.doi.org/10.1016/j.electacta.2008.09.028 en_US
dc.title Synthesis of nanosized vanadium pentoxide/carbon composites by spray pyrolysis for electrochemical capacitor application en_US
dc.parent Electrochimica Acta en_US
dc.journal.volume 54 en_US
dc.journal.number 5 en_US
dc.publocation United Kingdom en_US
dc.identifier.startpage 1420 en_US
dc.identifier.endpage 1425 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 030600 en_US
dc.personcode 113451 en_US
dc.personcode 0000062775 en_US
dc.personcode 0000062987 en_US
dc.personcode 114558 en_US
dc.personcode 109499 en_US
dc.percentage 50 en_US
dc.classification.name Physical Chemistry (incl. Structural en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords Electrochemical capacitor; Composites; Vanadium pentoxide; Spray pyrolysis en_US
dc.staffid 109499 en_US


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