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Enhanced borohydride oxidation kinetics with Au@MOF-808 nanocomposite electrocatalysts with ultra-low Au loading

2026-02Artigo de investigação Acesso aberto
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datacite.subject.fosEngenharia e Tecnologia::Engenharia Química
datacite.subject.fosEngenharia e Tecnologia::Engenharia dos Materiais
dc.contributor.authorBelhaj, Ines
dc.contributor.authorBecker, J. Alexander
dc.contributor.authorViana, Alexandre M.
dc.contributor.authorGusmão, Filipe M. B.
dc.contributor.authorChaves, Miguel
dc.contributor.authorPereira, Eulália
dc.contributor.authorSljukic, Biljana
dc.contributor.authorBalula, Salete S.
dc.contributor.authorSilva, Luis Cunha
dc.contributor.authorSantos, Diogo M. F.
dc.date.accessioned2026-02-27T11:04:08Z
dc.date.available2026-02-27T11:04:08Z
dc.date.issued2026-02
dc.description.abstractABSTRACT: The highly stable metal-organic framework (MOF) composed of[Zr6O4(mu 3-OH)4(OH)6(H2O)6(BTC)2]& sdot;nH2O units (MOF-808) was modified by incorporating gold (Au) nanoparticles and functional groups to enhance electrocatalytic activity for the borohydride oxidation reaction (BOR). Three composite materials (Au@MOF-808, Au@MOF-808-NH2, and Au@MOF-808-SH) were prepared by the incorporation of Au in structurally related MOFs, MOF-808, MOF-808-NH2, and MOF-808-SH, respectively. These composite materials were evaluated as anodic electrocatalysts for BOR in alkaline media using cyclic voltammetry and chronoamperometry. Among the prepared materials, Au@MOF-808-NH2 exhibited the highest BOR activity, with an apparent activation energy of 15.3 kJ mol-1, a reaction order of 0.6, an anodic charge transfer coefficient of 0.63, and a number of exchanged electrons of 4.4. The latter was significantly below the theoretical eight-electron value, indicating the presence of alternative reaction pathways. Notably, this material achieved a high mass-specific BOR peak current of 4.23 A mu gAu-1, demonstrating outstanding electrocatalytic efficiency despite the ultralow noble metal loading. These results underscore the potential of Au@MOF-808-NH2 as a cost-effective and scalable anodic electrocatalyst for high-performance direct borohydride fuel cells.eng
dc.identifier.citationBelhaj, I., Becker, J.A., Viana, A.M., Gusmão, F.M.B., Chaves, M., Pereira, E., Šljukić, B., Balula, S.S., Silva, L.C., & Santos, D.M.F. (2026). Enhanced borohydride oxidation kinetics with Au@MOF-808 nanocomposite electrocatalysts with ultra-low Au loading. In: Journal of Electroanalytical Chemistry, 2026, vol. 1008, article 119920. https://doi.org/10.1016/j.jelechem.2026.119920
dc.identifier.doi10.1016/j.jelechem.2026.119920
dc.identifier.eissn1873-2569
dc.identifier.issn1572-6657
dc.identifier.urihttp://hdl.handle.net/10400.9/6275
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationDevelopment of membranes and electrodes for direct liquid fuel cells with enhanced performance
dc.relation3×H2: A three-way approach to low-cost green hydrogen. High-efficiency electrodes, membranes, and electrolytes.
dc.relationLaboratory of Physics for Materials and Emergent Technologies
dc.relationCenter of Physics and Engineering of Advanced Materials
dc.relationAssociated Laboratory for Green Chemistry - Clean Technologies and Processes
dc.relationValorozation of glycerol to value-added products by novel gold@metal-organic framework catalysts
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S1572665726001335
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectElectrochemistry
dc.subjectGold
dc.subjectMetal organic framework
dc.subjectBorohydride oxidation
dc.subjectBorohydrides
dc.subjectFuel cells
dc.titleEnhanced borohydride oxidation kinetics with Au@MOF-808 nanocomposite electrocatalysts with ultra-low Au loadingeng
dc.typeresearch article
dspace.entity.typePublication
oaire.awardNumberUI/BD/153712/2022
oaire.awardNumber2023.09426.CEECIND/CP2830/CT0021
oaire.awardNumberLA/P/0095/2020
oaire.awardNumberUID/CTM/04540/2019
oaire.awardNumberUID/QUI/50006/2019
oaire.awardNumberSFRH/BD/150659/2020
oaire.awardTitleDevelopment of membranes and electrodes for direct liquid fuel cells with enhanced performance
oaire.awardTitle3×H2: A three-way approach to low-cost green hydrogen. High-efficiency electrodes, membranes, and electrolytes.
oaire.awardTitleLaboratory of Physics for Materials and Emergent Technologies
oaire.awardTitleCenter of Physics and Engineering of Advanced Materials
oaire.awardTitleAssociated Laboratory for Green Chemistry - Clean Technologies and Processes
oaire.awardTitleValorozation of glycerol to value-added products by novel gold@metal-organic framework catalysts
oaire.awardURIhttp://hdl.handle.net/10400.9/6270
oaire.awardURIhttp://hdl.handle.net/10400.9/6271
oaire.awardURIhttp://hdl.handle.net/10400.9/6272
oaire.awardURIhttp://hdl.handle.net/10400.9/6273
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FQUI%2F50006%2F2019/PT
oaire.awardURIhttp://hdl.handle.net/10400.9/6274
oaire.citation.titleJournal of Electroanalytical Chemistry
oaire.citation.volume1008
oaire.fundingStreamCEEC IND6ed
oaire.fundingStreamConcurso para Atribuição do Estatuto e Financiamento de Laboratórios Associados (LA)
oaire.fundingStreamFinanciamento do Plano Estratégico de Unidades de I&D - 2019
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
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relation.isProjectOfPublication.latestForDiscovery4fc5563e-211e-4aca-878a-221955827865

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