ATR-SEIRAS study of CO adsorption and oxidation on Rh modified Au(111-25 nm) film electrodes in 0.1 M H2SO4
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http://hdl.handle.net/10045/53167
Títol: | ATR-SEIRAS study of CO adsorption and oxidation on Rh modified Au(111-25 nm) film electrodes in 0.1 M H2SO4 |
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Autors: | Xu, Qinqin | Berná Galiano, Antonio | Pobelov, Ilya V. | Rodes, Antonio | Feliu, Juan M. | Wandlowski, Thomas | Kuzume, Akiyoshi |
Grups d'investigació o GITE: | Electroquímica de Superficies | Grupo de Espectroelectroquímica y Modelización (GEM) |
Centre, Departament o Servei: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica |
Paraules clau: | Rhodium | CO oxidation | ATR-SEIRAS | IRRAS | Thin films | Single crystal surfaces |
Àrees de coneixement: | Química Física |
Data de publicació: | 10-de setembre-2015 |
Editor: | Elsevier |
Citació bibliogràfica: | Electrochimica Acta. 2015, 176: 1202-1213. doi:10.1016/j.electacta.2015.07.165 |
Resum: | Rh modified Au(111-25 nm) electrodes, prepared by electron beam evaporation and galvanostatic deposition, were employed to study adsorption and electro-oxidation of CO on Rh in 0.1 M sulfuric acid solution by in situ attenuated total reflection surface enhanced infrared absorption spectroscopy (ATR-SEIRAS). The results of ATR-SEIRAS experiments were compared with those obtained by infrared reflection absorption spectroscopy on three low-index Rh single crystal surfaces. The Rh film deposited on Au(111-25 nm) electrode consists of 3D clusters forming a highly stepped [n(111) × (111)]-like surface with narrow (111) terraces. When CO was dosed at the hydrogen adsorption potential region, CO adsorbed in both atop (COL) and bridge (COB) configurations, as well as coadsorbed water species, were detected on the Rh film electrode. A partial interconversion of spectroscopic bands due to the CO displacement from bridge to atop sites was found during the anodic potential scan, revealing that there is a potential-dependent preference of CO adsorption sites on Rh surfaces. Our data indicate that CO oxidation on Rh electrode surface in acidic media involves coadsorbed water and follows the nucleation and growth model of a Langmuir-Hinshelwood type reaction. |
Patrocinadors: | The work was supported by the Research Center Jülich, the University of Bern, Swiss National Science Foundation (200020_144471, 200021-124643), the Spanish Ministerio de Economía y Competitividad (project CTQ2013-44083-P) and University of Alicante. QX acknowledges fellowships of the Research Center Jülich; IP acknowledges support by COST Action TD 1002; and AK acknowledges the financial support by CTI Swiss Competence Centers for Energy Research (SCCER Heat and Electricity Storage). |
URI: | http://hdl.handle.net/10045/53167 |
ISSN: | 0013-4686 (Print) | 1873-3859 (Online) |
DOI: | 10.1016/j.electacta.2015.07.165 |
Idioma: | eng |
Tipus: | info:eu-repo/semantics/article |
Drets: | © 2015 Elsevier Ltd. |
Revisió científica: | si |
Versió de l'editor: | http://dx.doi.org/10.1016/j.electacta.2015.07.165 |
Apareix a la col·lecció: | INV - EQSUP - Artículos de Revistas INV - GEM - Artículos de Revistas |
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2015_Xu_etal_ElectrActa_final.pdf | Versión final (acceso restringido) | 2,07 MB | Adobe PDF | Obrir Sol·licitar una còpia |
2015_Xu_etal_ElectrActa_preprint.pdf | Preprint (acceso abierto) | 659,31 kB | Adobe PDF | Obrir Vista prèvia |
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