Electrochemical reduction of SO2 on poly-Co-3-tetraaminophenylporphyrin glassy carbon modified electrode

This article describes the electrochemical reduction of sulfite in water-ethanol mixtures under acidic conditions on a glassy carbon electrode modified with a conducting film formed by Co(II) tetra-3-aminophenyl porphyrin. Rotating disc electrode experiments show a kinetic limitation related with th...

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Bibliographic Details
Published in:Journal of coordination chemistry 2009-10, Vol.62 (1), p.130-140
Main Authors: Fuenzalida, Francesca, Dreyse, Paulina, Villagra, Diego, Matsuhiro, Betty, Mendoza, Leonora, Aguirre, Maria J., Isaacs, Mauricio
Format: Article
Language:English
Subjects:
Co(II) porphyrin
Electrocatalysts
Electrochemical sensor
Modified electrodes
Reduction of sulfur compounds
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Summary:This article describes the electrochemical reduction of sulfite in water-ethanol mixtures under acidic conditions on a glassy carbon electrode modified with a conducting film formed by Co(II) tetra-3-aminophenyl porphyrin. Rotating disc electrode experiments show a kinetic limitation related with the formation of an adduct between the reduced porphyrin and the sulfur compound. UV-Visible spectroelectrochemical data suggest that Co(I) is not stabilized; thus the adduct should involve a radical species of the porphyrin. However, the resulting modified electrode is stable and shows a linear relationship between current and concentration of the sulfur species at pH 1. The detection range of sulfite by the modified electrode goes from 12 to 150 mg L −1 . The detection limit is 4.15 mg L −1 . ¶This article is dedicated to Professor A. Mederos.
ISSN:0095-8972
1029-0389
DOI:10.1080/00958970802474839