Oscillatory ethylene glycol electrooxidation reaction on Pt in alkaline media: The effect of surface orientation

Autor(es)

da Silva, Kaline Nascimento ; Nagao, Raphael ; Sitta, Elton

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 360, p. 8-pg., 2020-11-10.

Resumo

The ethylene glycol (EG) electrooxidation reaction was studied in alkaline media using three distinct platinum catalysts, named Pt(110), Pt(111) and Pt(poly) (or polycrystalline). While the reaction showed potential oscillations under current control when catalyzed by both Pt(poly) and Pt(111), no oscillations were observed employing Pt(110) once different amounts of adsorbed EG intermediates take place on the surfaces. Galvanostatic time-series (GTS) depicted a faster drift, i.e. amplitude, period and oscillation shape changes over time, on Pt(111) than in Pt(poly) for several EG concentrations and electrolyte temperatures, this behavior being explained by means of the maximum potential reached in each oscillation cycle and distinct mechanisms that trigger non-reversible processes on these surfaces. (c) 2020 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 16/01817-9 - Desenho e controle de padrões eletroquímicos auto-organizados
• Beneficiário: Raphael Nagao de Sousa
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 16/14758-0 - Instabilidades em eletrocatálise: cinética complexa catalisada por superfícies modelo
• Beneficiário: Kaline Nascimento da Silva
• Modalidade de apoio: Bolsas no Brasil - Mestrado