Author, as appears in the article.: Parrilla M; Cánovas R; Andrade FJ

Department: Química Analítica i Química Orgànica

e-ISSN: 1521-4109

URV's Author/s: Andrade, Francisco Javier

Keywords: Potentiometric sensors Nafion ion-exchange membrane Hydrogen peroxide Donnan potential

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 plays 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.

Thematic Areas: Saúde coletiva Química Psicología Medicina ii Medicina i Materiais Interdisciplinar Geociências Farmacia Engenharias iii Engenharias ii Electrochemistry Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Chemistry, analytical Biotecnología Biodiversidade Astronomia / física Analytical chemistry

licence for use: https://creativecommons.org/licenses/by/3.0/es/

Author's mail: franciscojavier.andrade@urv.cat

Author identifier: 0000-0003-1199-2837

Record's date: 2023-02-18

Papper version: info:eu-repo/semantics/acceptedVersion

Link to the original source: https://onlinelibrary.wiley.com/doi/abs/10.1002/elan.201600403

Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/

Papper original source: Electroanalysis. 29 (1): 223-230

APA: Parrilla M; Cánovas R; Andrade FJ (2017). Enhanced Potentiometric Detection of Hydrogen Peroxide Using a Platinum Electrode Coated with Nafion. Electroanalysis, 29(1), 223-230. DOI: 10.1002/elan.201600403

Article's DOI: 10.1002/elan.201600403

Entity: Universitat Rovira i Virgili

Journal publication year: 2017

Publication Type: Journal Publications