Fe, Co, N-doped carbon nanotubes as bifunctional oxygen electrocatalysts

• Tipo: Artigo em Revista Científica Internacional
• Data: 2022

Autores

Rafael Morais (Autor) FEUP; Rey Raap, N (Autor) Outra; Figueiredo, JL (Autor) Outra; Manuel Fernando R Pereira (Autor) FEUP

Revista

Título: Applied Surface Science

Vol. 572

ISSN: 0169-4332

Editora: Elsevier

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Projetos Associados

LA LSRE-LCM - Financiamento Plurianual 2020-2023 para a Unidade LA LSRE-LCM Laboratório de Processos de Separação e Reacção - Laboratório de Catálise e Materiais

UnirCell - Project UniRCell - Unitised Regenerative Fuel Cell for Efficient Renewable Energy Supply: from Materials to Device

BiCat4Energy - Electrocatalisadores bifuncionais baseados em materiais de carbono isentos de metais nobres para a produção de energia renovável: melhoramento da tecnologia da Célula de Combustível Unitária Regenerativa.

Outras Informações

ID Authenticus: P-00V-HB9

DOI: 10.1016/j.apsusc.2021.151459

Abstract (EN): Carbon nanotubes were modified towards oxygen reduction and evolution reactions by incorporation of cobalt and/or iron phthalocyanines (CoPc and FePc, respectively). The obtained monometallic samples were physically mixed in different ratios to assess the importance of each phthalocyanine. The increase of FePc content enhanced the electroactivity towards the oxygen reduction reaction, especially the limiting current density and reaction mechanism, for which two relationships were found by varying the CoPc:FePc mass ratio. Samples with a mass ratio (FePc:CoPc) >= 1 surpassed the electroactivity of the current commercial electrocatalyst (Pt/C) and presented similarly high long-term durability (82-85%). Interestingly, a synergetic effect between both types of metallic active centers was observed for the oxygen evolution reaction. A 1:1 CoPc:FePc mass ratio provided the highest oxygen evolution reaction electroactivity, displaying a potential of 1.67 V at 10 mA cm(-2), higher than that of the commercial RuO2 catalyst (1.58 V). This sample also presented the lowest potential gap (0.81 V), which is much lower than that of Pt/C (1.20 V) and RuO2 (1.41 V), demonstrating the high potential of these materials as substitutes of noble metal electrocatalysts.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13