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On the supercapacitive behaviour of anodic porous WO3-based negative electrodes

2017-04-01Journal article Open access
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dc.contributor.authorUpadhyay, Kush
dc.contributor.authorAltomare, Marco
dc.contributor.authorEugénio, Sónia
dc.contributor.authorSchmuki, Patrik
dc.contributor.authorMoura E Silva, Teresa
dc.contributor.authorMONTEMOR, MARIA
dc.date.accessioned2017-03-17T09:35:03Z
dc.date.available2017-03-17T09:35:03Z
dc.date.issued2017-04-01
dc.description.abstractHerein we illustrate the functionality as pseudocapacitive material of tungsten trioxide (WO3) nanochannel layers fabricated by electrochemical anodization of W metal in pure hot ortho-phosphoric acid (o-H3PO4). These layers are characterized by a defined nanochannel morphology and show remarkable pseudocapacitive behaviour in the negative potential (−0.8–0.5 V) in neutral aqueous electrolyte (1 M Na2SO4). The maximum volumetric capacitance of 397 F cm−3 is obtained at 2 A cm−3. The WO3 nanochannel layers display full capacitance retention (up to 114%) after 3500 charge-discharge cycles performed at 10 A cm−3. The relatively high capacitance and retention ability are attributed to the high surface area provided by the regular and defined nanochannel morphology. Kinetic analysis of the electrochemical results for the best performing WO3 structures, i.e., grown by 2 h-long anodization, reveals the occurrence of pseudocapacitance and diffusional controlled processes. Electrochemical impedance spectroscopy measurements show for the same structures a relatively low electrical resistance, which is the plausible cause for the superior electrochemical behaviour compared to the other structures.pt_PT
dc.description.versioninfo:eu-repo/semantics/acceptedVersionpt_PT
dc.identifier.citationUPADHYAY, Kush K.; [et al] – On the supercapacitive behaviour of anodic porous WO3-based negative electrodes. Electrochimica Acta. ISSN 0013-4686. Vol. 232 (2017), pp. 192-201pt_PT
dc.identifier.doihttp://dx.doi.org/10.1016/j.electacta.2017.02.131pt_PT
dc.identifier.issn0013-4686
dc.identifier.urihttp://hdl.handle.net/10400.21/6867
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttp://ac.els-cdn.com/S0013468617304115/1-s2.0-S0013468617304115-main.pdf?_tid=b039bf58-0af1-11e7-a7c7-00000aacb362&acdnat=1489742061_8c64c85b9099983704fcdaa681596359pt_PT
dc.subjectelectrochemical anodizationpt_PT
dc.subjectWO3 nanostructurept_PT
dc.subjectphosphoric acidpt_PT
dc.subjectsupercapacitorpt_PT
dc.subjectenergy storagept_PT
dc.titleOn the supercapacitive behaviour of anodic porous WO3-based negative electrodespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage201pt_PT
oaire.citation.startPage192pt_PT
oaire.citation.titleElectrochimica Actapt_PT
oaire.citation.volume232pt_PT
person.familyNameUpadhyay
person.familyNameMoura e Silva
person.familyNameMONTEMOR
person.givenNameKush
person.givenNameTeresa
person.givenNameFATIMA
person.identifier572597
person.identifier.ciencia-idB61F-5699-0F1E
person.identifier.ciencia-id2D17-B93D-44BC
person.identifier.ciencia-id3C16-79AA-7E94
person.identifier.orcid0000-0003-0120-6871
person.identifier.orcid0000-0001-8402-6600
person.identifier.orcid0000-0001-7835-6814
person.identifier.ridG-8065-2019
person.identifier.ridF-8778-2014
person.identifier.scopus-author-id56018964500
person.identifier.scopus-author-id6506601258
person.identifier.scopus-author-id7004347821
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication05ba1e6c-f4fd-43f7-9956-63bb128a2527
relation.isAuthorOfPublicationfe43fd19-4bc4-4486-a11f-534f08bc1212
relation.isAuthorOfPublication221aa2b5-1f6f-44c6-ae85-f227362e800b
relation.isAuthorOfPublication.latestForDiscovery221aa2b5-1f6f-44c6-ae85-f227362e800b

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