Cyclic voltammetry characterisation of the silicon-carbon
paste electrode interface in contact with indigo carmine (5,
5′-indigodisulfonic acid sodium salt) showed 3 redox peaks in acidic medium at
ph =3. These are the indigo carmine (ic) /leucoindigo carmine (lic) pair and
that of dehydroindigo carmine (dhic). These peaks appear at the respective
potentials ic (- 0.05v), lic (- 0.1 v) and dhic (0.5 v). In basic medium, only
one peak appears, that of dehydroindigo carmine at the potential 0.69 v vs ag/
agcl / kclsat. Dehydroindigo carmine obtained in a basic medium is adsorbed on
the surface of the working electrode. It has in its chemical structure the
carbonyl group capable of complexing mercury. During these redox reactions,
there is a transfer of two protons, h+, and two electrons. These redox
reactions take place at the surface of the working electrode containing the
active sites, thanks to the transport of matter by diffusion and adsorption.
Each redox peak has an electrochemical impedance consisting of the resistance
of the electrolyte, the electrochemical double layer capacity, the charge
transfer resistance and the warburg impedance. Their study allows the
equivalent electrical circuit of the interface to be produced.
Author(s) details
Seiny Roger N'dri
Department of Science and Technology, Laboratory of Fundamental and Applied
Sciences, Higher Normal School of Abidjan, 08 BP 10 Abidjan 08, Abidjan, Ivory
Coast.
Mariame Coulibaly
Department of Science and Technology, Laboratory of Fundamental and Applied
Sciences, Higher Normal School of Abidjan, 08 BP 10 Abidjan 08, Abidjan, Ivory
Coast.
N'guessan Alfred Yao
Department of Science and Technology, Laboratory of Fundamental and Applied
Sciences, Higher Normal School of Abidjan, 08 BP 10 Abidjan 08, Abidjan, Ivory
Coast.
Please see the book here :- https://doi.org/10.9734/bpi/cmsrf/v5/6455z
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