Effects of the Interfacial Structure on the Methanol Oxidation on Platinum Single Crystal Electrodes

Please use this identifier to cite or link to this item: http://hdl.handle.net/10045/89827
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Title: Effects of the Interfacial Structure on the Methanol Oxidation on Platinum Single Crystal Electrodes
Authors: Kamyabi, Mohammad Ali | Martínez-Hincapié, Ricardo | Feliu, Juan M. | Herrero, Enrique
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Methanol oxidation | Platinum single crystals | pH and concentration effects | Adsorbed OH
Knowledge Area: Química Física
Issue Date: 12-Mar-2019
Publisher: MDPI
Citation: Kamyabi MA, Martínez-Hincapié R, Feliu JM, Herrero E. Effects of the Interfacial Structure on the Methanol Oxidation on Platinum Single Crystal Electrodes. Surfaces. 2019; 2(1):177-192. doi:10.3390/surfaces2010014
Abstract: Methanol oxidation has been studied on low index platinum single crystal electrodes using methanol solutions with different pH (1–5) in the absence of specific adsorption. The goal is to determine the role of the interfacial structure in the reaction. The comparison between the voltammetric profiles obtained in the presence and absence of methanol indicates that methanol oxidation is only taking place when the surface is partially covered by adsorbed OH. Thus, on the Pt(111) electrode, the onset for the direct oxidation of methanol and the adsorption of OH coincide. In this case, the adsorbed OH species are not a mere spectator, because the obtained results for the reaction order for methanol and the proton concentrations indicate that OH adsorbed species are involved in the reaction mechanism. On the other hand, the dehydrogenation step to yield adsorbed CO on the Pt(100) surface coincides with the onset of OH adsorption on this electrode. It is proposed that adsorbed OH collaborates in the dehydrogenation step during methanol oxidation, facilitating either the adsorption of the methanol in the right configuration or the cleavage of the C—H bond.
Sponsor: This research was funded by the MINECO (Spain), grant number CTQ2016-76221-P.
URI: http://hdl.handle.net/10045/89827
ISSN: 2571-9637
DOI: 10.3390/surfaces2010014
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Peer Review: si
Publisher version: https://doi.org/10.3390/surfaces2010014
Appears in Collections:INV - EQSUP - Artículos de Revistas

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