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An analysis of the kinetics of oxidation of ascorbate at poly(aniline)-poly(styrene sulfonate) modified microelectrodes

An analysis of the kinetics of oxidation of ascorbate at poly(aniline)-poly(styrene sulfonate) modified microelectrodes
An analysis of the kinetics of oxidation of ascorbate at poly(aniline)-poly(styrene sulfonate) modified microelectrodes
A detailed kinetic study is provided for the oxidation of ascorbate at poly(aniline)–poly(styrene sulfonate) coated microelectrodes. Flat films with a low degree of polymer spillover and a thickness much lower than the microelectrode radius were produced by controlled potentiodynamic electrodeposition. The currents for ascorbate oxidation are found to be independent of the polymer thickness, indicating that the reaction occurs at the outer surface of the polymer film. At low ascorbate concentrations, below around 40 mM, the currents are found to be mass transport limited. At higher ascorbate concentrations the currents became kinetically limited. The experimental data for measurements at a range of potentials are fitted to a consistent kinetic model and the results summarized in a case diagram. The results obtained for the poly(aniline)-(polystyrene sulfonate) coated microelectrode are compared to those for a poly(aniline)-poly(vinyl sulfonate) coated microelectrode and to the results of an earlier study of the reaction at poly(aniline)-poly(vinyl sulfonate) coated rotating disc electrodes. For poly(aniline)-poly(styrene sulfonate) the oxidation of ascorbate is found to proceed by one electron reaction whereas for poly(aniline)-poly(vinyl sulfonate) the reaction is found to be a two electron oxidation.


1463-9076
5365-5372
Bonastre, A.M.
9731c624-c993-4b25-a69a-fa03cf2abaca
Sosna, M.
36542c5a-56cc-413c-b99b-efc8493b19af
Bartlett, P.N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Bonastre, A.M.
9731c624-c993-4b25-a69a-fa03cf2abaca
Sosna, M.
36542c5a-56cc-413c-b99b-efc8493b19af
Bartlett, P.N.
d99446db-a59d-4f89-96eb-f64b5d8bb075

Bonastre, A.M., Sosna, M. and Bartlett, P.N. (2011) An analysis of the kinetics of oxidation of ascorbate at poly(aniline)-poly(styrene sulfonate) modified microelectrodes. Physical Chemistry Chemical Physics, 13 (12), 5365-5372. (doi:10.1039/c0cp02327b). (PMID:21340076)

Record type: Article

Abstract

A detailed kinetic study is provided for the oxidation of ascorbate at poly(aniline)–poly(styrene sulfonate) coated microelectrodes. Flat films with a low degree of polymer spillover and a thickness much lower than the microelectrode radius were produced by controlled potentiodynamic electrodeposition. The currents for ascorbate oxidation are found to be independent of the polymer thickness, indicating that the reaction occurs at the outer surface of the polymer film. At low ascorbate concentrations, below around 40 mM, the currents are found to be mass transport limited. At higher ascorbate concentrations the currents became kinetically limited. The experimental data for measurements at a range of potentials are fitted to a consistent kinetic model and the results summarized in a case diagram. The results obtained for the poly(aniline)-(polystyrene sulfonate) coated microelectrode are compared to those for a poly(aniline)-poly(vinyl sulfonate) coated microelectrode and to the results of an earlier study of the reaction at poly(aniline)-poly(vinyl sulfonate) coated rotating disc electrodes. For poly(aniline)-poly(styrene sulfonate) the oxidation of ascorbate is found to proceed by one electron reaction whereas for poly(aniline)-poly(vinyl sulfonate) the reaction is found to be a two electron oxidation.


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Published date: 2011

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Local EPrints ID: 179397
URI: https://eprints.soton.ac.uk/id/eprint/179397
ISSN: 1463-9076
PURE UUID: a18f59d1-9346-43b1-893a-ede8bc226aed
ORCID for P.N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900

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Date deposited: 01 Apr 2011 13:57
Last modified: 06 Jun 2018 13:10

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Author: A.M. Bonastre
Author: M. Sosna
Author: P.N. Bartlett ORCID iD

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