Unraveling the Nature of Active Sites in Ethanol Electro-oxidation by Site-Specific Marking of a Pt Catalyst with Isotope-Labeled 13CO
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Título: | Unraveling the Nature of Active Sites in Ethanol Electro-oxidation by Site-Specific Marking of a Pt Catalyst with Isotope-Labeled 13CO |
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Autor/es: | Farias, Manuel J.S. | Cheuquepán, William | Tanaka, Auro A. | Feliu, Juan M. |
Grupo/s de investigación o GITE: | Electroquímica de Superficies | Grupo de Espectroelectroquímica y Modelización (GEM) |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica |
Palabras clave: | Active sites | Ethanol electro-oxidation | Pt catalyst | Isotope-labeled 13CO |
Área/s de conocimiento: | Química Física |
Fecha de publicación: | 16-feb-2018 |
Editor: | American Chemical Society |
Cita bibliográfica: | The Journal of Physical Chemistry Letters. 2018, 9(6): 1206-1210. doi:10.1021/acs.jpclett.8b00030 |
Resumen: | This works deals with the identification of preferential site-specific activation at a model Pt surface during a multiproduct reaction. The (110)-type steps of a Pt(332) surface were selectively marked by attaching isotope-labeled 13CO molecules to them, and ethanol oxidation was probed by in situ Foureir transfrom infrared spectroscopy in order to precisely determine the specific sites at which CO2, acetic acid, and acetaldehyde were preferentially formed. The (110) steps were active for splitting the C–C bond, but unexpectedly, we provide evidence that the pathway of CO2 formation was preferentially activated at (111) terraces, rather than at (110) steps. Acetaldehyde was formed at (111) terraces at potentials comparable to those for CO2 formation also at (111) terraces, while the acetic acid formation pathway became active only when the (110) steps were released by the oxidation of adsorbed 13CO, at potentials higher than for the formation of CO2 at (111) terraces of the stepped surface. |
Patrocinador/es: | M.J.S.F. is grateful to PNPD/CAPES (Brazil). A.A.T. acknowledges CAPES (PROCAD-2013) and CNPq (309066/2013-1). J.M.F. thanks the MINECO (Spain) project-CTQ2013-44083-P. |
URI: | http://hdl.handle.net/10045/74635 |
ISSN: | 1948-7185 |
DOI: | 10.1021/acs.jpclett.8b00030 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2018 American Chemical Society |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1021/acs.jpclett.8b00030 |
Aparece en las colecciones: | INV - GEM - Artículos de Revistas INV - EQSUP - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2018_Farias_etal_JPhysChemLett_final.pdf | Versión final (acceso restringido) | 1,86 MB | Adobe PDF | Abrir Solicitar una copia |
2018_Farias_etal_JPhysChemLett_revised.pdf | Versión revisada (acceso abierto) | 1,98 MB | Adobe PDF | Abrir Vista previa |
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