Journal
ELECTROANALYSIS
Volume 22, Issue 3, Pages 338-344Publisher
WILEY-BLACKWELL
DOI: 10.1002/elan.200900298
Keywords
Tetraruthenated porphyrins; Modified electrodes; Nafion membranes; Electrocatalysis; Sulfite; Reduction
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Funding
- program Anillo Bicentenaric, de Ciencia y Tecnologfa CONICYT
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This work describes electrocatalytic detection of S(IV) compounds in water-ethanol solutions under acidic conditions, on a glassy carbon electrode modified with Co(II) tetraruthenated porphyrin electrostatically assembled onto a Nafion film. The I(pc) current shows a linear relationship with the concentration of S(IV) oxo-anions. Controlled potential electrolysis shows that thiosulfate was detected as reaction product. Rotating disk electrode and UV-visible spectroelectrochemistry experiments showed a kinetic limitation to the electron transfer controlled by charge propagation in the film and the formation of an intermediary between Co center and S(IV) species. The reproducibility of the modification methodology presents a RSD of 4.1%.
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