Low-potential reduction of sulfite at a ruthenium-oxide hexacyanoferrate modified electrode

The low-potential reduction of sulfite at a ruthenium-oxide hexacyanoferrate (RuOHCF)-modified electrode is reported. A decrease (200mV) in the overpotential of the sulfite reduction reaction and a substantial current increase (compared to the bare glassy-carbon electrode) were verified. Evidence is...

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Bibliographic Details
Published in:Electrochemistry communications 2012-07, Vol.21, p.26-29
Main Authors: Montes, Rodrigo H.O., Richter, Eduardo M., Munoz, Rodrigo A.A.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Electrocatalysis
Electrochemical methods
Exact sciences and technology
Ruthenium-oxide hexacyanoferrate
Sulfite
Thin-layer diffusion
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Summary:The low-potential reduction of sulfite at a ruthenium-oxide hexacyanoferrate (RuOHCF)-modified electrode is reported. A decrease (200mV) in the overpotential of the sulfite reduction reaction and a substantial current increase (compared to the bare glassy-carbon electrode) were verified. Evidence is found for a mass transport regime which includes a thin-layer diffusional process (sulfite species trapped within the RuOHCF film) responsible for the lowered reductive potential (rather than electrocatalytic properties of the film). The low-potential (−0.2V vs. Ag/AgCl/saturated KCl) amperometric detection of sulfite in 0.25molL−1 HCl was free of interferences from substances typically found in food samples. ► Low-potential reduction of sulfite at ruthenium-oxide hexacyanoferrate. ► Decrease in the overpotential of sulfite reduction and ample current increase. ► Contribution from thin-layer diffusional process is evidenced. ► Amperometric detection of sulfite free of interferences from food constituents.
ISSN:1388-2481
1873-1902
DOI:10.1016/j.elecom.2012.05.005