Challenges in Electrocatalysis of Ammonia Oxidation on Platinum Surfaces: Discovering Reaction Pathways

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorVenturini, Seiti I.-
Autor(es): dc.creatorMartins de Godoi, Denis R.-
Autor(es): dc.creatorPerez, Joelma-
Data de aceite: dc.date.accessioned2025-08-21T19:02:39Z-
Data de disponibilização: dc.date.available2025-08-21T19:02:39Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2023-08-18-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1021/acscatal.3c00677-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/299049-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/299049-
Descrição: dc.descriptionA deep understanding of the ammonia oxidation reaction (AOR) over platinum surfaces may facilitate the use of ammonia as a carbon-free source for energy storage and conversion. Herein, using an unprecedented experimental approach of combining online electrochemical mass spectrometry (OLEMS) and ion chromatography (IC) with high-area Pt/C surfaces, many AOR products were simultaneously detected and the variation in AOR selectivity depending on the surface conditions was demonstrated. In the low-potential region of 0.40-0.82 V, the adsorbed OH- was the dominant oxygenated surface species. The AOR onset potential was 0.40 V, and the surface intermediates were NHx,ads and N2Hy,ads, which were the main precursors of N2, considered a major product. N2H4, NO, and NH2OH were considered minor products in this potential region. In the high-potential region, from 0.82 V, adsorbed O2- was the main oxygenated surface species, owing to the strong interactions between OH- and oxidized Pt. We found that NO and N2O play a key role as reaction intermediates. Another remarkable result is the detection of HN3 as a gaseous product. NO2, N2H4, and NH2OH were considered the minor products. The nitrite and nitrate detected by IC were solution-phase products of the AOR at high potentials. The real-time identification of seven gaseous products, viz., N2, NO, N2H4, NH2OH, HN3, N2O, and NO2, and two solution-phase products, NO2- and NO3-, enabled us to propose AOR mechanistic pathways, opening more possibilities for the electrochemical generation of high-value-added nitrogenated products depending on Pt surface conditions.-
Descrição: dc.descriptionUniversity of São Paulo (USP) São Carlos Institute of Chemistry, São Paulo-
Descrição: dc.descriptionSão Paulo State University (Unesp) Institute of Chemistry, São Paulo-
Descrição: dc.descriptionSão Paulo State University (Unesp) Institute of Chemistry, São Paulo-
Formato: dc.format10835-10845-
Idioma: dc.languageen-
Relação: dc.relationACS Catalysis-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectammonia oxidation reaction-
Palavras-chave: dc.subjectelectrocatalysis-
Palavras-chave: dc.subjectOLEMS-
Palavras-chave: dc.subjectplatinum-
Palavras-chave: dc.subjectreaction mechanism-
Título: dc.titleChallenges in Electrocatalysis of Ammonia Oxidation on Platinum Surfaces: Discovering Reaction Pathways-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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