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The oxidation of ascorbate at copolymeric sulfonated poly(aniline) coated on glassy carbon electrodes

The oxidation of ascorbate at copolymeric sulfonated poly(aniline) coated on glassy carbon electrodes
The oxidation of ascorbate at copolymeric sulfonated poly(aniline) coated on glassy carbon electrodes

Self-doped poly(aniline)s as electrode coatings to catalyze ascorbate oxidation are revisited in this article. Sulfonated poly(aniline) (SPAN) was deposited on glassy carbon electrodes as a copolymer of aniline and its sulfonated derivative, 2-aminobenzenesulfonic acid (2-ABSA). The resulting deposits are reproducible and show good stability and electroactivity at pH > 7, enabling studies at typical physiological pH values. Calibration curves were obtained using a rotating disc electrode at a sampling potential of 0.2 V, displaying linear dependence in the region 0–20 mM ascorbate. A kinetic model based on the Michaelis–Menten reaction mechanism, previously validated for poly(aniline) composites, was used to analyse the form of the calibration curve leading to values of the effective reaction constants KME and k?ME. New calibration curves constructed for different sampling potentials were used to elucidate the rate limiting step at saturated kinetics. Rotating disc voltammetry performed at increasing pH (from pH 2 to 9) showed a dramatic decrease in the limiting current, without any evidence for a change in the reaction mechanism.

sulfonated poly(aniline), ascorbate, electrocatalysis, kinetics
105-113
Sanchis, C.
9a49d4ec-5f28-41bb-8bfb-715d30196642
Ghanem, M.A.
f256d3b0-8767-4c1b-919d-2c9582102162
Salavagione, H.J.
0ef36265-6ef2-403c-8f42-13857f6408b7
Morallón, E.
b3779d2e-94ab-4b92-9e20-aaf630cd8f76
Bartlett, P.N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Sanchis, C.
9a49d4ec-5f28-41bb-8bfb-715d30196642
Ghanem, M.A.
f256d3b0-8767-4c1b-919d-2c9582102162
Salavagione, H.J.
0ef36265-6ef2-403c-8f42-13857f6408b7
Morallón, E.
b3779d2e-94ab-4b92-9e20-aaf630cd8f76
Bartlett, P.N.
d99446db-a59d-4f89-96eb-f64b5d8bb075

Sanchis, C., Ghanem, M.A., Salavagione, H.J., Morallón, E. and Bartlett, P.N. (2011) The oxidation of ascorbate at copolymeric sulfonated poly(aniline) coated on glassy carbon electrodes. Bioelectrochemistry, 80 (2), 105-113. (doi:10.1016/j.bioelechem.2010.06.006). (PMID:20638913)

Record type: Article

Abstract


Self-doped poly(aniline)s as electrode coatings to catalyze ascorbate oxidation are revisited in this article. Sulfonated poly(aniline) (SPAN) was deposited on glassy carbon electrodes as a copolymer of aniline and its sulfonated derivative, 2-aminobenzenesulfonic acid (2-ABSA). The resulting deposits are reproducible and show good stability and electroactivity at pH > 7, enabling studies at typical physiological pH values. Calibration curves were obtained using a rotating disc electrode at a sampling potential of 0.2 V, displaying linear dependence in the region 0–20 mM ascorbate. A kinetic model based on the Michaelis–Menten reaction mechanism, previously validated for poly(aniline) composites, was used to analyse the form of the calibration curve leading to values of the effective reaction constants KME and k?ME. New calibration curves constructed for different sampling potentials were used to elucidate the rate limiting step at saturated kinetics. Rotating disc voltammetry performed at increasing pH (from pH 2 to 9) showed a dramatic decrease in the limiting current, without any evidence for a change in the reaction mechanism.

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More information

Published date: February 2011
Keywords: sulfonated poly(aniline), ascorbate, electrocatalysis, kinetics

Identifiers

Local EPrints ID: 177979
URI: http://eprints.soton.ac.uk/id/eprint/177979
PURE UUID: 17c5ba7b-5691-47ac-b85d-513e5ff9c1af
ORCID for P.N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900

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Date deposited: 22 Mar 2011 11:42
Last modified: 15 Mar 2024 02:44

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Contributors

Author: C. Sanchis
Author: M.A. Ghanem
Author: H.J. Salavagione
Author: E. Morallón
Author: P.N. Bartlett ORCID iD

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