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Retaining the specific capacitance under electrochemical stress: A pH-induced self-protection mechanism for manganese dioxide pseudocapacitive electrodes

2023-11Research article Open access
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authorProfile.emailbiblioteca@isel.pt
datacite.subject.fosEngenharia e Tecnologia::Engenharia Mecânica
dc.contributor.authorAlves, Aila Cossovan
dc.contributor.authorChiavassa, Luísa
dc.contributor.authorMartins, Tiago D.
dc.contributor.authorTaryba, Maryna
dc.contributor.authorBaleizão, Carlos
dc.contributor.authorMoura e Silva, Teresa
dc.contributor.authorMONTEMOR, FATIMA
dc.date.accessioned2025-09-19T10:19:40Z
dc.date.available2025-09-19T10:19:40Z
dc.date.issued2023-11
dc.description.abstractIn this study, we report the enhanced electrochemical performance of a MnO2 electrode modified with a pH-sensitive co-polymer, activated at acidic pH, and designed to counteract MnO2 degradation in aqueous aqueous pseudocapacitors. The conformation of this polymer is controlled by the local pH changes that occur at the electrode/electrolyte interface during electrochemical stress associated to oxygen evolution. As a proof of concept, we demonstrate that the addition of the pH-sensitive polymer contributes to improved electrode integrity and lifetime under over-polarization with oxygen evolution. After undergoing 10 cycles of electrochemical stress, the MnO2/pH-sensitive polymer composite retains similar to 70 % of its capacitance. This remarkable result stands in stark contrast with the pristine MnO2 electrode which fails catastrophically under the same stress conditions. We believe that this pH-induced self-protection mechanism represents a significant advancement in the development of novel smarter self-healing electroactive materials for the next generation of energy storage devices.eng
dc.identifier.citationAlves, A. C., Chiavassa, L., Martins, T. D., Taryba, M., Baleizão, C., Silva, T. M., & Montemor, M. F. (2023). Retaining the specific capacitance under electrochemical stress: A pH-induced self-protection mechanism for manganese dioxide pseudocapacitive electrodes. Electrochemistry Communications, 156, 1-4. https://doi.org/10.1016/j.elecom.2023.107596
dc.identifier.doihttps://doi.org/10.1016/j.elecom.2023.107596
dc.identifier.eissn1873-1902
dc.identifier.issn1388-2481
dc.identifier.urihttp://hdl.handle.net/10400.21/22147
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationCentro de Química Estrutural
dc.relationLA/P/0056/2020
dc.relationPTDC/QUI-ELT/2075/2020
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S1388248123001704?via%3Dihub
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectSelf-healing material
dc.subjectManganese dioxide
dc.subjectpH-responsive polymer
dc.subjectElectrochemical stress
dc.subjectPseudocapacitor
dc.titleRetaining the specific capacitance under electrochemical stress: A pH-induced self-protection mechanism for manganese dioxide pseudocapacitive electrodeseng
dc.typeresearch article
dspace.entity.typePublication
oaire.awardTitleCentro de Química Estrutural
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00100%2F2020/PT
oaire.citation.endPage4
oaire.citation.startPage1
oaire.citation.titleElectrochemistry Communications
oaire.citation.volume156
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43
person.familyNameTaryba
person.familyNameMoura e Silva
person.familyNameMONTEMOR
person.givenNameMaryna
person.givenNameTeresa
person.givenNameFATIMA
person.identifier572597
person.identifier.ciencia-idF71C-3392-8454
person.identifier.ciencia-id2D17-B93D-44BC
person.identifier.ciencia-id3C16-79AA-7E94
person.identifier.orcid0000-0001-5668-2213
person.identifier.orcid0000-0001-8402-6600
person.identifier.orcid0000-0001-7835-6814
person.identifier.ridL-9448-2017
person.identifier.ridF-8778-2014
person.identifier.scopus-author-id35070567000
person.identifier.scopus-author-id6506601258
person.identifier.scopus-author-id7004347821
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
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