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

Article's DOI: 10.1002/elan.201600403

Entity: Universitat Rovira i Virgili

Journal publication year: 2016

First page: 223

Publication Type: Article Artículo Article