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dc.contributor.authorLima, Scarllet Lalesca Santos de-
dc.contributor.authorPereira, Fellipe dos Santos-
dc.contributor.authorLima, Roberto Batista de-
dc.contributor.authorFreitas, Isabel Cristina de-
dc.contributor.authorSpadotto, Julio-
dc.contributor.authorConnolly, Brian J.-
dc.contributor.authorBarreto, Jade-
dc.contributor.authorStavale, Fernando-
dc.contributor.authorVitorino, Hector Aguilar-
dc.contributor.authorFajardo, Humberto Vieira-
dc.contributor.authorTanaka, Auro Atsushi-
dc.contributor.authorGarcia, Marco Aurélio Suller-
dc.contributor.authorSilva, Anderson Gabriel Marques da-
dc.identifier.citationLIMA, S. L. S. de et al. MnO2-Ir nanowires: combining ultrasmall nanoparticle sizes, O-Vacancies, and low noble-metal loading with improved activities towards the oxygen reduction reaction. Nanomaterials, v. 12, n. 17, artigo 3039, 2022. Disponível em: <>. Acesso em: 01 ago. 2023.pt_BR
dc.description.abstractAlthough clean energy generation utilizing the Oxygen Reduction Reaction (ORR) can be considered a promising strategy, this approach remains challenging by the dependence on high loadings of noble metals, mainly Platinum (Pt). Therefore, efforts have been directed to develop new and efficient electrocatalysts that could decrease the Pt content (e.g., by nanotechnology tools or alloying) or replace them completely in these systems. The present investigation shows that high catalytic activity can be reached towards the ORR by employing 1.8 ± 0.7 nm Ir nanoparticles (NPs) deposited onto MnO2 nanowires surface under low Ir loadings (1.2 wt.%). Interestingly, we observed that the MnO2 -Ir nanohybrid presented high catalytic activity for the ORR close to commercial Pt/C (20.0 wt.% of Pt), indicating that it could obtain efficient performance using a simple synthetic procedure. The MnO2 -Ir electrocatalyst also showed improved stability relative to commercial Pt/C, in which only a slight activity loss was observed after 50 reaction cycles. Considering our findings, the superior performance delivered by the MnO2 -Ir nanohybrid may be related to (i) the significant concentration of reduced Mn3+ species, leading to increased concentration of oxygen vacancies at its surface; (ii) the presence of strong metal-support interactions (SMSI), in which the electronic effect between MnOx and Ir may enhance the ORR process; and (iii) the unique structure comprised by Ir ultrasmall sizes at the nanowire surface that enable the exposure of high energy surface/facets, high surface-to-volume ratios, and their uniform dispersion.pt_BR
dc.subjectManganese dioxidept_BR
dc.subjectLow metal loadingpt_BR
dc.titleMnO2-Ir nanowires : combining ultrasmall nanoparticle sizes, O-Vacancies, and low noble-metal loading with improved activities towards the oxygen reduction reaction.pt_BR
dc.typeArtigo publicado em periodicopt_BR
dc.rights.licenseThis article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/). Fonte: PDF do artigo.pt_BR
Appears in Collections:DEQUI - Artigos publicados em periódicos

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