On the behavior of the Pt(1 0 0) and vicinal surfaces in alkaline media
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Título: | On the behavior of the Pt(1 0 0) and vicinal surfaces in alkaline media |
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Autor/es: | Arán-Ais, Rosa M. | Figueiredo, Marta C. | Vidal-Iglesias, Francisco J. | 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: | Pt(1 0 0) stepped surfaces | NaOH | pztc | CO charge displacement | CO oxidation |
Área/s de conocimiento: | Química Física |
Fecha de publicación: | 30-dic-2011 |
Editor: | Elsevier |
Cita bibliográfica: | Electrochimica Acta. 2011, 58: 184-192. doi:10.1016/j.electacta.2011.09.029 |
Resumen: | We address in this paper a voltammetric study of the charge transfer processes characteristic of Pt(1 0 0) and vicinal surfaces in alkaline media. The electrochemical behavior of a series of stepped surfaces of the type Pt(S)[n(1 0 0) × (1 1 1)] has been characterized using cyclic voltammetry at different pHs, charge displacement measurements and FTIR experiments for adsorbed CO. The results from these techniques allow assigning the different peaks appearing in the voltammogram to hydrogen and/or OH adsorption on the different sites of these surfaces, namely, terrace and step sites. Additionally, the potential of zero total charge (pztc) of the electrodes was determined. The resulting pztc values shift to more negative values when the step density increases on the surface up to n = 5. FTIR spectroscopy experiments have been used to monitor the adsorption of CO on the different surfaces as well as the consequent CO oxidation, accompanying a positive potential sweep. The oxidation of adsorbed CO on (1 0 0) terraces is catalyzed by the presence of the (1 1 1) steps. The FTIR spectra revealed that CO is mostly bonded in bridge configuration at low potentials interconverting to on-top when the electrode potential is increased. |
Patrocinador/es: | The work was carried out under financial support by the European Commission (through FP7 Initial Training Network “ELCAT”, Grant Agreement No. 214936-2) and MICINN (project No. CTQ2010-16271). |
URI: | http://hdl.handle.net/10045/55567 |
ISSN: | 0013-4686 (Print) | 1873-3859 (Online) |
DOI: | 10.1016/j.electacta.2011.09.029 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2011 Elsevier Ltd. |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1016/j.electacta.2011.09.029 |
Aparece en las colecciones: | INV - EQSUP - Artículos de Revistas Investigaciones financiadas por la UE |
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2011_Aran_etal_ElectrActa_final.pdf | Versión final (acceso restringido) | 771,14 kB | Adobe PDF | Abrir Solicitar una copia |
2011_Aran_etal_ElectrActa_rev.pdf | Versión revisada (acceso abierto) | 366,63 kB | Adobe PDF | Abrir Vista previa |
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