On the behavior of the Pt(1 0 0) and vicinal surfaces in alkaline media

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Title: On the behavior of the Pt(1 0 0) and vicinal surfaces in alkaline media
Authors: Arán-Ais, Rosa M. | Figueiredo, Marta C. | Vidal-Iglesias, Francisco J. | Climent, Victor | 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: Pt(1 0 0) stepped surfaces | NaOH | pztc | CO charge displacement | CO oxidation
Knowledge Area: Química Física
Issue Date: 30-Dec-2011
Publisher: Elsevier
Citation: Electrochimica Acta. 2011, 58: 184-192. doi:10.1016/j.electacta.2011.09.029
Abstract: 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.
Sponsor: 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
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2011 Elsevier Ltd.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.electacta.2011.09.029
Appears in Collections:INV - EQSUP - Artículos de Revistas
Research funded by the EU

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