Understandings on the Inhibition of Oxygen Reduction Reaction by Bromide Adsorption on Pt(111) Electrodes at Different pH Values

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Título: Understandings on the Inhibition of Oxygen Reduction Reaction by Bromide Adsorption on Pt(111) Electrodes at Different pH Values
Autor/es: Briega-Martos, Valentín | Mello, Gisele A.B. | Arán-Ais, Rosa M. | Climent, Victor | Herrero, Enrique | 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: Electrocatalysis | Oxygen reduction reaction | Pt(111)
Área/s de conocimiento: Química Física
Fecha de publicación: 7-sep-2018
Editor: ECS
Cita bibliográfica: Journal of The Electrochemical Society. 2018, 165(15): J3045-J3051. doi:10.1149/2.0081815jes
Resumen: Oxygen reduction reaction (ORR) is studied on Pt(111) in the presence of different concentrations of bromide anions at different pH values ranging from very acidic to neutral solutions. While adsorbed bromide inhibits the ORR, the strength of the inhibition decreases when the pH is increased. This is a consequence of the lower relative adsorption energy of bromide at higher pH values, caused by the lower absolute applied potential. This is reflected in a shift of the onset of the ORR (as measured with the hanging meniscus rotating disc electrode, HMRDE) to higher values as the pH is increased. HMRDE measurements reveal that the limiting current density (jlim) coincides with the theoretical value for two electrons only at very acidic solutions. However, when pH is increased, jlim tends toward the value for a four electrons reaction. From pH > 3 jlim coincides both in the presence and in the absence of bromide despite the specific anion adsorption. Experiments in solutions with different ionic strength and hydrogen peroxide reduction measurements suggest that the formation of a reaction intermediate different from H2O2 is favored at neutral pH values.
Patrocinador/es: This work has been financially supported by the MCINN-FEDER (Spain) through project CTQ2016-76221-P. VBM thankfully acknowledges to MINECO the award of a pre-doctoral grant (BES-2014-068176, project CTQ2013-44803-P). GABM thanks the post-doctorate fellowship from CNPq (grant no. PDE 233268/2014-6).
URI: http://hdl.handle.net/10045/80007
ISSN: 0013-4651 (Print) | 1945-7111 (Online)
DOI: 10.1149/2.0081815jes
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © The Author(s) 2018. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited.
Revisión científica: si
Versión del editor: https://doi.org/10.1149/2.0081815jes
Aparece en las colecciones:INV - EQSUP - Artículos de Revistas

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