Potential modulated reflectance spectroscopy of Pt(111) in acidic and alkaline media: cyanide adsorption

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Title: Potential modulated reflectance spectroscopy of Pt(111) in acidic and alkaline media: cyanide adsorption
Authors: Huerta Arráez, Francisco | Morallon, Emilia | Quijada Tomás, César | Vázquez Picó, José Luis | Berlouis, L.E.A.
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | University of Strathclyde. Department of Pure and Applied Chemistry
Keywords: UV-visible reflectance spectroscopy | Low index crystal surfaces | Adsorbed cyanide | Platinum
Knowledge Area: Química Física
Date Created: 15-Nov-1999
Issue Date: 5-Mar-1999
Publisher: Elsevier
Citation: HUERTA ARRÁEZ, Francisco, et al. "Potential modulated reflectance spectroscopy of Pt(111) in acidic and alkaline media: cyanide adsorption". Journal of Electroanalytical Chemistry. Vol. 463, Issue 1 (5 March 1999). ISSN 0022-0728, pp. 109-115
Abstract: The electroreflectance (ER) technique has been applied to the study of a Pt(111) electrode in different acidic and alkaline electrolytes. The variation in the normalised potential derivative of the reflectance signal, 1/R(dR/dE) is observed in sulphuric and perchloric acid media as the potential is scanned 1.0 V positive from the hydrogen evolution region. In both these media, the usual hydrogen adsorption-desorption region corresponds to a zone in which the ER signal is practically zero and does not change with the potential. However, in the anomalous region, an increase in the ER signal was observed indicating that here, the adsorbed species increased the electron density of the platinum surface. The ER spectrum recorded for the cyanide-covered Pt(111) surface showed a large decrease in the electron density of the platinum surface and this is attributed to electron back-donation from the platinum to the adsorbed cyanide. In alkaline solutions, the integrated ER spectrum showed relatively small changes which corresponded to the features in the cyclic voltammogram and were attributed to the reorientation of the hydrogen-bonded surface species and water dipoles.
Sponsor: Ministerio de Educación y Cultura; Generalitat Valenciana.
URI: http://hdl.handle.net/10045/7813
ISSN: 0022-0728
DOI: 10.1016/S0022-0728(98)00453-7
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/S0022-0728(98)00453-7
Appears in Collections:INV - GEPE - Artículos de Revistas

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