Oxygen reduction reaction on stepped platinum surfaces in alkaline media

Please use this identifier to cite or link to this item: http://hdl.handle.net/10045/38753
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Title: Oxygen reduction reaction on stepped platinum surfaces in alkaline media
Authors: Rizo, Rubén | Herrero, Enrique | Feliu, Juan M.
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: Oxygen reduction reaction | Platinum surfaces | Single crystals electrodes | Alkaline media
Knowledge Area: Química Física
Issue Date: 12-Jul-2013
Publisher: Royal Society of Chemistry
Citation: Physical Chemistry Chemical Physics. 2013, 15: 15416-15425. doi:10.1039/C3CP51642C
Abstract: The oxygen reduction reaction (ORR) in 0.1 M NaOH on platinum single crystal electrodes has been studied using hanging meniscus rotating disk electrode configuration. Basal planes and stepped surfaces with (111) and (100) terraces have been employed. The results indicate that the Pt(111) electrode has the highest electrocatalytic activity among all the studied surfaces. The addition of steps on this electrode surface significantly diminishes the reactivity of the surface towards the ORR. In fact, the reactivity of the steps on the surfaces with wide terraces can be considered negligible with respect to that measured for the terrace. On the other hand, Pt(100) and Pt(110) electrodes have much lower activity than the Pt(111) electrode. These results have been compared with those obtained in acid media to understand the effect of the pH and the adsorbed OH on the mechanism. It is proposed that the surface covered by adsorbed OH is active for the reduction of the oxygen molecules.
Sponsor: This work has been financially supported by the MICINN (Spain) (project CTQ2010-16271-FEDER) and Generalitat Valenciana (project PROMETEO/2009/045, -FEDER).
URI: http://hdl.handle.net/10045/38753
ISSN: 1463-9076 (Print) | 1463-9084 (Online)
DOI: 10.1039/C3CP51642C
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Royal Society of Chemistry 2013
Peer Review: si
Publisher version: http://dx.doi.org/10.1039/C3CP51642C
Appears in Collections:INV - EQSUP - Artículos de Revistas

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