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Electrochemical performance of MnOx·center dot nH(2)O@Ni composite foam electrodes for energy storage in KOH media

2018-08-10Journal article Restricted access
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dc.contributor.authorSiwek, Katarzyna
dc.contributor.authorEugénio, S.
dc.contributor.authorMoura E Silva, Teresa
dc.contributor.authorMONTEMOR, FATIMA
dc.date.accessioned2018-11-28T12:40:00Z
dc.date.available2018-11-28T12:40:00Z
dc.date.issued2018-08-10
dc.description.abstractNanostructured porous MnO2, especially its hydrated amorphous and low crystalline form (MnO2·nH2O), has been one of the most promising material considered for charge storage applications, due to electrochemical similarities with RuO2 and its relative low cost. However, the intrinsic poor conductivity of MnO2 combined with the presence of structural water, which provides high ionic but low electronic conductivity, is a great hindrance for wider application. An effective approach to overcome this drawback involves the deposition of thin MnO2 layers on porous, high surface area metallic scaffolds. The present work addresses this route and provides novel insights thanks to the combination of MnOx·nH2O with custom-made Ni foams, fabricated via one-step electrodeposition using the dynamic hydrogen bubble template (DHBT). The porous Ni foams provide a scaffold with a 3D architecture with optimized pore size and surface. The composite electrode was fabricated by anodic deposition of MnOx·nH2O on the 3D Ni foams. The electrochemical behaviour was tested in 1 M KOH, since there are very few studies addressing the electrochemical behaviour of MnOx·nH2O in alkaline media for electrochemical supercapacitors applications. In addition, thermal treatment (150–250 °C) was performed to evaluate the effect of hydration on the material properties. The results revealed that the as-obtained composites are highly stable, displaying much higher specific capacitances with 73–90% (depending on the mass load) capacitance retention compared to their de-hydrated counterparts. The charge-discharge processes were found to be highly reversible throughout 5000 cycles, maintaining almost 100% columbic efficiency. In conclusion, the MnOx·nH2O@Ni composite electrodes showed a very stable pseudocapacitive behaviour and exceptional cycling performance in 1 M KOH, being therefore a promising alternative charge storage electrode for electrochemical supercapacitors.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSIWEK, K. I.; [et al] – Electrochemical performance of MnOx·center dot nH(2)O@Ni composite foam electrodes for energy storage in KOH media. Electrochimica Acta. ISSN 0013-4686. Vol. 281 (2018), pp. 39-47pt_PT
dc.identifier.doihttps://doi.org/10.1016/j.electacta.2018.05.122pt_PT
dc.identifier.issn0013-4686
dc.identifier.issn1873-3859
dc.identifier.urihttp://hdl.handle.net/10400.21/9101
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationNi-based nanostructures and their composites as electrodes for asymmetric supercapacitors
dc.relation.publisherversionhttps://reader.elsevier.com/reader/sd/pii/S0013468618311678?token=DC47586AEF387B87A52579D2023AA1947B706AACEC3C71C702FE1DAF9E0C3FAE24628D9E3529FFAFDEDC96099C34AC3Bpt_PT
dc.subjectManganese dioxidept_PT
dc.subject3D nickel foampt_PT
dc.subjectFunctionalpt_PT
dc.subjectElectrodepositionpt_PT
dc.subjectSupercapacitorspt_PT
dc.subjectDióxido de manganêspt_PT
dc.titleElectrochemical performance of MnOx·center dot nH(2)O@Ni composite foam electrodes for energy storage in KOH mediapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleNi-based nanostructures and their composites as electrodes for asymmetric supercapacitors
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PEst-OE%2FQUI%2FUI0100%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/M-ERA-NET%2F0004%2F2014/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F123963%2F2016/PT
oaire.citation.endPage47pt_PT
oaire.citation.startPage39pt_PT
oaire.citation.titleElectrochimica Actapt_PT
oaire.citation.volume281pt_PT
oaire.fundingStream3599-PPCDT
oaire.fundingStream3599-PPCDT
person.familyNameSiwek
person.familyNameMoura e Silva
person.familyNameMONTEMOR
person.givenNameKatarzyna
person.givenNameTeresa
person.givenNameFATIMA
person.identifier572597
person.identifier.ciencia-id2D17-B93D-44BC
person.identifier.ciencia-id3C16-79AA-7E94
person.identifier.orcid0000-0002-1070-965X
person.identifier.orcid0000-0001-8402-6600
person.identifier.orcid0000-0001-7835-6814
person.identifier.ridF-8778-2014
person.identifier.scopus-author-id6506601258
person.identifier.scopus-author-id7004347821
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication76e06731-118d-453c-a8b8-77aa123dd63f
relation.isAuthorOfPublicationfe43fd19-4bc4-4486-a11f-534f08bc1212
relation.isAuthorOfPublication221aa2b5-1f6f-44c6-ae85-f227362e800b
relation.isAuthorOfPublication.latestForDiscoveryfe43fd19-4bc4-4486-a11f-534f08bc1212
relation.isProjectOfPublication61da5932-f392-4692-bb6c-df647fd26901
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