Site-specific catalytic activity of model platinum surfaces in different electrolytic environments as monitored by the CO oxidation reaction

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Título: Site-specific catalytic activity of model platinum surfaces in different electrolytic environments as monitored by the CO oxidation reaction
Autor/es: Farias, Manuel J.S. | Mello, Gisele A.B. | Tanaka, Auro A. | 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 | Surface structure-sensitive | Anions adsorption | Active sites | CO electro-oxidation
Área/s de conocimiento: Química Física
Fecha de publicación: ene-2017
Editor: Elsevier
Cita bibliográfica: Journal of Catalysis. 2017, 345: 216-227. doi:10.1016/j.jcat.2016.11.031
Resumen: Stepped Pt surfaces having different width (1 1 1) terraces interrupted by (1 1 0) or (1 0 0) monoatomic steps were employed to evaluate the catalytic activity toward CO oxidation at Pt specific sites in HClO4, H2SO4, and H3PO4 solutions, as well as in phosphate buffer and alkaline solution. The catalytic activity at the (1 1 1) terraces was sensitive to the nature of the anions derived from the electrolyte dissociation, while no effect on activity was detected at the monoatomic steps. A change in solution pH, passing from acid to alkaline solutions, had contrasting effects on catalytic activity at the (1 1 1) terraces and the step sites, with the catalytic activity of the (1 1 1) terraces improving, while activity at the step sites deteriorated. During the CO adlayer oxidation, the release of surface sites occurred preferentially from the (1 1 1) terraces of the Pt(s) − [(n − 1)(1 1 1) × (1 1 0)] surfaces, while from Pt(s) − [(n)(1 1 1) × (1 0 0)] surfaces, (1 1 1) terrace and (1 0 0) step sites were released simultaneously.
Patrocinador/es: M.J.S. Farias acknowledges financial support from PNPD/CAPES (Brazil). G.A.B.M. received a post-doctorate fellowship from CNPq (grant no. PDE 233268/2014-6). A.A.T. acknowledges support from CAPES (PROCAD 2013) and CNPq (grant no. 309066/2013-1). J.M.F. thanks MICINN (Project CTQ2016-76221-P) and Generalitat Valenciana (Project PROMETEOII/2014/013) for financial support.
URI: http://hdl.handle.net/10045/66567
ISSN: 0021-9517 (Print) | 1090-2694 (Online)
DOI: 10.1016/j.jcat.2016.11.031
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2016 Elsevier Inc.
Revisión científica: si
Versión del editor: http://dx.doi.org/10.1016/j.jcat.2016.11.031
Aparece en las colecciones:INV - EQSUP - Artículos de Revistas

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