Investigation of ion-selective electrodes with neutral ionophores and ionic sites by EIS. I. Theory - Sorbonne Université Access content directly
Journal Articles Journal of Electroanalytical Chemistry Year : 2004

Investigation of ion-selective electrodes with neutral ionophores and ionic sites by EIS. I. Theory

Abstract

Models of an ion selective electrode involving an ionophore and mobile sites in a membrane are proposed. The first model, called the phase boundary potential model, supposed thermodynamic equilibrium; it allows the concentrations of the various species to be calculated. Then, a kinetic model, which takes into account the ionic transfer at the membrane|solution interfaces, was derived. The impedance of the membrane was calculated. It shows that a membrane with nernstian behavior shows only one capacitive loop in the impedance diagram, which is related to the conductivity and dielectric properties of the material of the membrane. Non-nernstian behavior is related to slow ionic transfer at the membrane|solution interfaces or/and transport limitation of the species in the membrane. Finite rate constants of the ionic transfer lead to a capacitive loop in the middle frequency range, whereas finite rate transport leads to a diffusional impedance in the low frequency range.

Dates and versions

hal-04197728 , version 1 (06-09-2023)

Identifiers

Cite

Claude Gabrielli, Patrick Hemery, Pierre Letellier, Michele Masure, Hubert Perrot, et al.. Investigation of ion-selective electrodes with neutral ionophores and ionic sites by EIS. I. Theory. Journal of Electroanalytical Chemistry, 2004, 570 (2), pp.275-289. ⟨10.1016/j.jelechem.2004.04.006⟩. ⟨hal-04197728⟩
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