In situ FT–IRRAS study of SO2 adlayers formed on Pt(111) electrodes from open-circuit adsorption in acidic media

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Title: In situ FT–IRRAS study of SO2 adlayers formed on Pt(111) electrodes from open-circuit adsorption in acidic media
Authors: Quijada Tomás, César | Rodes García, Antonio | Huerta Arráez, Francisco | Vázquez Picó, José Luis
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física
Keywords: Sulphur dioxide | Platinum | Reflection spectroscopy | Low index single crystal surfaces | Metal–electrolyte interfaces | Electrochemical methods
Knowledge Area: Química Física
Date Created: 15-Dec-1997
Issue Date: 1-Nov-1998
Publisher: Elsevier
Citation: QUIJADA TOMAS, César, et al. "In situ FT–IRRAS study of SO2 adlayers formed on Pt(111) electrodes from open-circuit adsorption in acidic media". Electrochimica Acta. Vol. 44, Issues 6-7 (1 Nov. 1998). ISSN 0013-4686, pp. 1091-1096
Abstract: The irreversible adsorption of SO2 on Pt(111) electrodes has been studied in acid media by means of cyclic voltammetry and in situ FT–IRRA Spectroscopy. The resulting adsorbed residue presents a characteristic vibrational band at 1220 cm−1 (0.65 V) either in 0.5 M HClO4 or 0.5 M HCl. In the potential region of constant coverage (0.65–1.0 V) the bandcentre frequency increases linearly with potential at a tuning rate of 65–75 cm−1 V−1. This shift may result from mixed contributions from Stark and/or backbonding effects. Below 0.65 V, the abrupt decrease in band frequency can be linked to the weakening of the dipole–dipole coupling effect resulting from the decrease in SO2 surface coverage. From the vibrational data for SO2–transition metal complexes and with the aid of the surface selection rule, the band at 1220–1240 cm−1 can be assigned to the asymmetric stretching mode of undissociated SO2, bound to the surface via S and one of the O atoms in a η2-bridging configuration.
Sponsor: Dirección General de Investigación Ciencia y Tecnología (PB93-0944); Ministerio of Educación y Cultura; Instituto de Cultura J. Gil Albert; Generalitat Valenciana.
URI: http://hdl.handle.net/10045/7818
ISSN: 0013-4686
DOI: 10.1016/S0013-4686(98)00212-6
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/S0013-4686(98)00212-6
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