Role of oxygen-containing species at Pt(111) on the oxygen reduction reaction in acid media

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Título: Role of oxygen-containing species at Pt(111) on the oxygen reduction reaction in acid media
Autor/es: Gómez Marín, Ana María | Feliu, Juan M.
Grupo/s de investigación o GITE: Electroquímica de Superficies
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Palabras clave: Electrochemically oxygenated species | Pt(111) | Oxygen reduction reaction | Scan rate dynamics | Rotating disk electrode
Área/s de conocimiento: Química Física
Fecha de publicación: sep-2015
Editor: Springer Berlin Heidelberg
Cita bibliográfica: Journal of Solid State Electrochemistry. 2015, 19(9): 2831-2841. doi:10.1007/s10008-015-2850-7
Resumen: The oxygen reduction reaction (ORR) is one of the fundamental reactions in electrochemistry and has been widely studied, but the mechanistic details of ORR still remain elusive. In this work, the role of electrochemically oxygenated species, such as adsorbed hydroxide, OHads, adsorbed oxygen, Oads, and Pt(111) oxide, PtO, in the ORR dynamics is studied by employing electrochemical techniques, i.e., combining rotating disk mass-transport control with potential sweep rate perturbation. In this framework, a reduction peak at 0.85 V, E ORR, is detected. This peak shows a different electrochemical dynamics than that of Pt(111) oxides. The data analysis suggests that neither OHads nor Oads are the main bottleneck in the mechanism. Instead, results support the reduction of a soluble intermediate species as the rate determining step in the mechanism. On the other hand, PtO species, which are generated at relatively high potentials and are responsible of surface disordering, strongly inhibit the ORR as long as they are adsorbed in the electrode surface.
Patrocinador/es: This study has been carried out in the framework of the European Commission FP7 Initial Training Network “ELCAT,” Grant Agreement No. 214936–2. Supports from the Spanish MINECO though project CTQ2013–44083-P and GV through PROMETEOII/2014/013 (FEDER) are greatly acknowledged.
ISSN: 1432-8488 (Print) | 1433-0768 (Online)
DOI: 10.1007/s10008-015-2850-7
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © Springer-Verlag Berlin Heidelberg 2015. The final publication is available at Springer via
Revisión científica: si
Versión del editor:
Aparece en las colecciones:INV - EQSUP - Artículos de Revistas
Investigaciones financiadas por la UE

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