Electrochemical behaviour of aqueous SO2 at polycrystalline gold electrodes in acidic media: a voltammetric and in situ vibrational study. Part 1. Reduction of SO2: deposition of monomeric and polymeric sulphur
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Title: | Electrochemical behaviour of aqueous SO2 at polycrystalline gold electrodes in acidic media: a voltammetric and in situ vibrational study. Part 1. Reduction of SO2: deposition of monomeric and polymeric sulphur |
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Authors: | Quijada Tomás, César | Huerta Arráez, Francisco | Morallon, Emilia | 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: | Sulphur dioxide | Sulphur adsorption | Gold electrode | Cyclic voltammetry | SER spectroscopy | FT-IR spectroscopy | Electro-reduction |
Knowledge Area: | Química Física |
Date Created: | 7-Sep-1999 |
Issue Date: | 1-Feb-2000 |
Publisher: | Elsevier |
Citation: | QUIJADA TOMAS, César, et al. "Electrochemical behaviour of aqueous SO2 at polycrystalline gold electrodes in acidic media: a voltammetric and in situ vibrational study. Part 1. Reduction of SO2: deposition of monomeric and polymeric sulphur". Electrochimica Acta. Vol. 45, Issue 11 (1 Febr. 2000). ISSN 0013-4686, pp. 1847-1862 |
Abstract: | The electro-reduction of SO2 has been monitored by using cyclic voltammetry, FT-IR spectroscopy and SER spectroscopy. Prior to the bulk reduction, SO2 is reduced to yield a monomeric sulphur adlayer at a maximum coverage of about 0.25. The sulphur adlayer undergoes a reversible redox surface process at E<0.0 V (RHE), which implies a change in the frequency of the Au-S stretching mode from 270 to 300/310 cm−1. In the potential region encompassing the bulk reduction voltammetric peak, infrared spectra display a band at 2585 cm−1 attributable to a S-H vibration from a soluble species. Accordingly, H2S or H2Sx were proposed as tentative bulk reduction products. In positive sweeps a broad anodic wave develops between 0.2 and 0.6 V that leaves polymeric sulphur species adsorbed at multilayer level, with a S-S stretching mode at 460 cm−1 and a S-S-S bending vibration at 218 cm−1. Multilayer sulphur can be removed reductively under a sharp cathodic peak. According to literature of the S(-II)/Au system, removal proceeds to yield soluble S(-II) species, via intermediate polysulphides. |
Sponsor: | Ministerio de Educación y Cultura (Programa F.P.I.); Generalitat Valenciana. |
URI: | http://hdl.handle.net/10045/7820 |
ISSN: | 0013-4686 |
DOI: | 10.1016/S0013-4686(99)00396-5 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.1016/S0013-4686(99)00396-5 |
Appears in Collections: | INV - GEPE - Artículos de Revistas |
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Electrochimica Acta 45 (2000) 1847–1862.pdf | Versión final (acceso restringido) | 278,09 kB | Adobe PDF | Open Request a copy |
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