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Electrochemical Reduction of S(IV) Compounds in Water‐Ethanol Solutions at Nafion/Tetraruthenated Porphyrins Glassy Carbon Modified Electrodes
Author(s) -
Calfumán Karla,
García Macarena,
Aguirre Maria J.,
Matsuhiro Betty,
Mendoza Leonora,
Isaacs Mauricio
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200900298
Subject(s) - nafion , glassy carbon , electrochemistry , electrolysis , electrode , thiosulfate , chemistry , porphyrin , electron transfer , inorganic chemistry , carbon fibers , photochemistry , materials science , cyclic voltammetry , organic chemistry , electrolyte , sulfur , composite material , composite number
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%.