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Enhanced Potentiometric Detection of Hydrogen Peroxide Using a Platinum Electrode Coated with Nafion

  • Datos identificativos

    Identificador: PC:3260
    Autores:
    Andrade, F.J.Parrilla, M.Cánovas, R.
    Resumen:
    The potentiometric response to hydrogen peroxide of a platinum electrode coated with a layer of Nafion is presented. The results show that the Nafion membrane acts as an effective permselective barrier, thus significantly reducing the response to some redox active species, such as ascorbate. Even more interesting, these coated electrodes show a significantly enhanced sensitivity to hydrogen peroxide (H2O2) when the measurements are performed in solutions of high ionic strength. The influence of pH, ionic strength and supporting electrolyte on this enhancement are presented. Under optimized conditions these coated electrodes show a linear dependence with the logarithm of the concentration of H2O2, with sensitivities of -125.1±5.9 mV decade-1 (several times higher than the bare electrodes) and a linear range that spans from 10-5 M to 10-3 M of H2O2. Preliminary studies suggest that the coupling between the redox potential on the Pt electrode and the Donnan potential of the membrane play a role on this enhancement. Considering this improved sensitivity, selectivity, stability and linear ranges, this system shows promise as a future platform to build enzyme-based potentiometric biosensors.
  • Otros:

    Autor según el artículo: Andrade, F.J.; Parrilla, M.; Cánovas, R.
    Departamento: Química Analítica i Química Orgànica
    Autor/es de la URV: ANDRADE , FRANCISCO JAVIER; Parrilla, M.; Cánovas, R.
    Resumen: The potentiometric response to hydrogen peroxide of a platinum electrode coated with a layer of Nafion is presented. The results show that the Nafion membrane acts as an effective permselective barrier, thus significantly reducing the response to some redox active species, such as ascorbate. Even more interesting, these coated electrodes show a significantly enhanced sensitivity to hydrogen peroxide (H2O2) when the measurements are performed in solutions of high ionic strength. The influence of pH, ionic strength and supporting electrolyte on this enhancement are presented. Under optimized conditions these coated electrodes show a linear dependence with the logarithm of the concentration of H2O2, with sensitivities of -125.1±5.9 mV decade-1 (several times higher than the bare electrodes) and a linear range that spans from 10-5 M to 10-3 M of H2O2. Preliminary studies suggest that the coupling between the redox potential on the Pt electrode and the Donnan potential of the membrane play a role on this enhancement. Considering this improved sensitivity, selectivity, stability and linear ranges, this system shows promise as a future platform to build enzyme-based potentiometric biosensors.
    Grupo de investigación: Grup de Quimiometria, Qualimetria i Nanosensors
    Áreas temáticas: Química Química Chemistry
    Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 1040-0397
    Identificador del autor: 0000-0003-1199-2837; 0000-0002-1344-8432; 0000-0001-9552-535X
    Fecha de alta del registro: 2018-04-30
    Página final: 230
    Volumen de revista: 29
    Versión del articulo depositado: info:eu-repo/semantics/acceptedVersion
    Enlace a la fuente original: https://onlinelibrary.wiley.com/doi/abs/10.1002/elan.201600403
    Programa de financiación: altres; European Union, Marie Curie Grant; FlexSens; PCIG09-GA-2011- 293538 altres; Fundación Recercaixa; SensAge; plan; CTQ2013- 46404-R altres; URV Martí i Franqués; 2013PMF-PIPF-16
    URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
    DOI del artículo: 10.1002/elan.201600403
    Entidad: Universitat Rovira i Virgili
    Año de publicación de la revista: 2016
    Página inicial: 223
    Tipo de publicación: Article Artículo Article
  • Palabras clave:

    Aigua oxigenada
    Potenciometria
    Sensors electroquímics
    Química
    Química
    Chemistry
    1040-0397
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