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

  • Identification data

    Identifier: PC:3260
    Authors:
    Andrade, F.J.Parrilla, M.Cánovas, R.
    Abstract:
    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.
  • Others:

    Author, as appears in the article.: Andrade, F.J.; Parrilla, M.; Cánovas, R.
    Department: Química Analítica i Química Orgànica
    URV's Author/s: ANDRADE , FRANCISCO JAVIER; Parrilla, M.; Cánovas, R.
    Abstract: 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.
    Research group: Grup de Quimiometria, Qualimetria i Nanosensors
    Thematic Areas: Química Química Chemistry
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 1040-0397
    Author identifier: 0000-0003-1199-2837; 0000-0002-1344-8432; 0000-0001-9552-535X
    Record's date: 2018-04-30
    Last page: 230
    Journal volume: 29
    Papper version: info:eu-repo/semantics/acceptedVersion
    Link to the original source: https://onlinelibrary.wiley.com/doi/abs/10.1002/elan.201600403
    Funding program: 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
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Article's DOI: 10.1002/elan.201600403
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2016
    First page: 223
    Publication Type: Article Artículo Article
  • Keywords:

    Aigua oxigenada
    Potenciometria
    Sensors electroquímics
    Química
    Química
    Chemistry
    1040-0397
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