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Capacitance response in an aqueous electrolyte of Nb2O5 nanochannel layers anodically grown in pure molten o-H3PO4

2018-08-10Journal article Restricted access
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dc.contributor.authorUpadhyay, Kush
dc.contributor.authorCha, Gihoon
dc.contributor.authorHildebrand, Helga
dc.contributor.authorSchmuki, Patrik
dc.contributor.authorMoura E Silva, Teresa
dc.contributor.authorMONTEMOR, FATIMA
dc.contributor.authorAltomare, Marco
dc.date.accessioned2018-11-28T13:07:08Z
dc.date.available2018-11-28T13:07:08Z
dc.date.issued2018-08-10
dc.description.abstractVertically aligned Nb2O5 nanochannel layers are grown on Nb metal substrates by self-organizing electrochemical anodization in a pure molten o-H3PO4 electrolyte. The capacitive behavior of these structures when used as negative electrodes is investigated in aqueous 1 M Na2SO4 electrolyte, in a potential range from −0.2 to −1.25 V vs. SCE. Surface chemistry, morphology and crystallographic features of the Nb2O5 nanochannel electrodes are tailored by adjusting the synthesis parameters, namely anodization time and crystallization temperature, which have a significant effect on the electrode performance. 8 μm thick Nb2O5 nanochannel layers that are converted into orthorhombic phase by crystallization at 450 °C, display a maximized areal capacitance of ∼100 mF cm-2 at a current density of 1 mA cm−2. These electrodes retain 63% of the initial capacitance at 10 mA cm−2 and 81% after 1500 charge-discharge cycles at a current density of 1.3 mA cm−2. Kinetic analysis of the electrochemical results reveals the occurrence of pseudocapacitive and diffusion-controlled processes. Electrochemical impedance spectroscopy evidences for these structures a low resistance across the electrode and at the electrode/substrate interface. These results are associated with the nanochannel morphology (high active area) of the Nb2O5 layers, and are ascribed to their crystalline nature, which provides an “oriented porosity” for ion diffusion and directional pathways for charge transport and collection.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationUPADHYAY, Kush K.; [et al] – Capacitance response in an aqueous electrolyte of Nb2O5 nanochannel layers anodically grown in pure molten o-H3PO4. Electrochimica Acta. ISSN 0013-4686. Vol. 281 (2018), pp. 725-737pt_PT
dc.identifier.doihttps://doi.org/10.1016/j.electacta.2018.06.014pt_PT
dc.identifier.issn0013-4686
dc.identifier.issn1873-3859
dc.identifier.urihttp://hdl.handle.net/10400.21/9102
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation20130674 - Erasmus Mundus NAMASTEpt_PT
dc.relationEXC 315 - DFG cluster of excellence EAMpt_PT
dc.relationEntirely Self-organized: Arrayed Single-Particle-in-a-Cavity Reactors for Highly Efficient and Selective Catalytic/Photocatalytic Energy Conversion and Solar Light Reaction Engineering
dc.relation.publisherversionhttps://reader.elsevier.com/reader/sd/pii/S001346861831301X?token=00A3A169C5797841474CBEBF56AC230A552D8831A7279E2A61C74E4EDD3C3765E58A0221FD114AC1309F96908C29EE7Fpt_PT
dc.subjectNiobium oxidept_PT
dc.subjectNanochannelpt_PT
dc.subjectAnodizationpt_PT
dc.subjectÓxido de nióbiopt_PT
dc.subjectAnodizaçãopt_PT
dc.titleCapacitance response in an aqueous electrolyte of Nb2O5 nanochannel layers anodically grown in pure molten o-H3PO4pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleEntirely Self-organized: Arrayed Single-Particle-in-a-Cavity Reactors for Highly Efficient and Selective Catalytic/Photocatalytic Energy Conversion and Solar Light Reaction Engineering
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FQUI%2F00100%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/RECI%2FQEQ-QIN%2F0189%2F2012/PT
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/340511/EU
oaire.citation.endPage737pt_PT
oaire.citation.startPage725pt_PT
oaire.citation.titleElectrochimica Actapt_PT
oaire.citation.volume281pt_PT
oaire.fundingStream5876
oaire.fundingStream3599-PPCDT
oaire.fundingStreamFP7
person.familyNameUpadhyay
person.familyNameSchmuki
person.familyNameMoura e Silva
person.familyNameMONTEMOR
person.familyNameAltomare
person.givenNameKush
person.givenNamePatrik
person.givenNameTeresa
person.givenNameFATIMA
person.givenNameMarco
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.orcid0000-0002-9208-5771
person.identifier.orcid0000-0001-8402-6600
person.identifier.orcid0000-0001-7835-6814
person.identifier.orcid0000-0002-7237-8809
person.identifier.ridG-8065-2019
person.identifier.ridF-8778-2014
person.identifier.ridL-8884-2016
person.identifier.scopus-author-id56018964500
person.identifier.scopus-author-id7005779145
person.identifier.scopus-author-id6506601258
person.identifier.scopus-author-id7004347821
person.identifier.scopus-author-id55175865600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameEuropean Commission
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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