Author, as appears in the article.: Baez JF, Compton M, Chahrati S, Cánovas R, Blondeau P, Andrade FJ
Department: Química Analítica i Química Orgànica
URV's Author/s: Andrade, Francisco Javier / Blondeau, Pascal Jean Claude Leon
Project code: CTQ2016-77128-R
Keywords: Sodium Response mechanism Polyelectrolytes Platinum Ph Oxygen reduction reaction Monitoring glucose Mixed potential Hydrogen peroxide Cell Biosensors
Abstract: The use of a Pt electrode coated with a layer of Nation has been described in previous works as an attractive way to perform the potentiometric detection of hydrogen peroxide. Despite of the attractive features of this approach, the nature of the non-Nernstian response of this system was not properly addressed. In this work, using a mixed potential model, the open circuit potential of the Pt electrode is shown to be under kinetic control of the oxygen reduction reaction (ORR). It is proposed that hydrogen peroxide acts as an oxygenated species that blocks free sites on the Pt surface, interfering with the ORR. Therefore, the effect of the polyelectrolyte coating can be understood in terms of the modulation of the factors that affects the kinetics of the ORR, such as an increase of the H + concentration, minimization of the effect of the spectator species, etc. Because of the complexity and the lack of models that accurately describe systems with practical applications, this work is not intended to provide a mechanistic but rather a phenomenological view on problem. A general framework to understand the factors that affect the potentiometric response is provided. Experimental evidence showing that the use of polyelectrolyte coatings are a powerful way to control the mixed potential open new ways for the development of robust and simple potentiometric sensors. (C) 2019 Elsevier B.V. All rights reserved.
Thematic Areas: Spectroscopy Química Odontología Medicina ii Medicina i Materiais Matemática / probabilidade e estatística Interdisciplinar Geociências General medicine Farmacia Environmental chemistry Engenharias iv Engenharias iii Engenharias ii Enfermagem Ciências biológicas iii Ciências biológicas ii Ciências biológicas i Ciências agrárias i Ciência de alimentos Ciência da computação Chemistry, analytical Biotecnología Biodiversidade Biochemistry Astronomia / física Analytical chemistry
licence for use: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 00032670
Author's mail: pascal.blondeau@urv.cat franciscojavier.andrade@urv.cat
Author identifier: 0000-0003-1331-5055 0000-0003-1199-2837
Record's date: 2023-02-18
Papper version: info:eu-repo/semantics/acceptedVersion
Link to the original source: https://www.sciencedirect.com/science/article/abs/pii/S0003267019313625
Funding program: Programa Estatal de Investigación, Desarrollo e Innovación Orientada a los Retos de la Sociedad (Agencia Estatal de Investigación - Ministerio de Economía, Industria y Competitividad)
Papper original source: Analytica Chimica Acta. 1097 204-213
APA: Baez JF, Compton M, Chahrati S, Cánovas R, Blondeau P, Andrade FJ (2020). Controlling the mixed potential of polyelectrolyte-coated platinum electrodes for the potentiometric detection of hydrogen peroxide. Analytica Chimica Acta, 1097(), 204-213. DOI: 10.1016/j.aca.2019.11.018
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Acronym: HOMESENS
Article's DOI: 10.1016/j.aca.2019.11.018
Entity: Universitat Rovira i Virgili
Journal publication year: 2020
Funding program action: Proyecto de I+D
Publication Type: Journal Publications