Electrochemical Impedance Spectroscopy Characterization of a Solid-State Electrode with Potential Application in Pb2+ Ions Detection

  • M. Viltres-Portales Instituto de Ciencia y Tecnología de Materiales, Universidad de La Habana, La Habana, Cuba
  • A. R. Lazo-Fraga Instituto de Ciencia y Tecnología de Materiales, Universidad de La Habana, La Habana, Cuba
  • A. Peláiz-Barranco Faculty of Physics, University of Havana, Havana, Cuba
  • M. E. Mendoza Instituto de Física, Universidad Benemérita Autónoma de Puebla, Puebla, México
  • O. García-Zaldívar Grupo de Materiales Ferroicos, Facultad de Física-Instituto de Ciencia y Tecnología de Materiales, Universidad de la Habana, La Habana, Cuba

Abstract

In this work, the characterization of a solid-state ion-selective electrode (SS-ISE) by electrochemical impedance spectroscopy (EIS) was performed for potential detection of Pb2+ ions. This electrode is based on a PVC-membrane with an aroylthiourea derivative as ionophore. The solid transducer was prepared using an epoxy-graphite-graphene composite. The impedance analysis (from 20 Hz-1 MHz) allows to describe the electrochemical response of the electrode in terms of the electrical processes in the membrane instead of the circuital elements related to the charge-transfer process at the transducer/membrane interface. The Pb2+ ions concentration was determined with this SS-ISE in aqueous solution by EIS using the electrical resistance of the membrane. The limit of detection reached by this approach was in the concentration range from 10-7-10-6 mol/L, one order of magnitude lower than the obtained by classical potentiometry. This analysis could be applied on the implementation of analytical determinations by EIS using SS-ISE.

Published
Jul 14, 2022
How to Cite
VILTRES-PORTALES, M. et al. Electrochemical Impedance Spectroscopy Characterization of a Solid-State Electrode with Potential Application in Pb2+ Ions Detection. Revista Cubana de Física, [S.l.], v. 39, n. 1, p. 12-17, july 2022. ISSN 2224-7939. Available at: <http://www.revistacubanadefisica.org/index.php/rcf/article/view/2022v39p012>. Date accessed: 28 sep. 2022.
Section
Original Articles