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  4. Influence of cationic and anionic additives on the electrical properties of ionophore-based ion-selective membranes
 
research article

Influence of cationic and anionic additives on the electrical properties of ionophore-based ion-selective membranes

Morf, W. E.
•
de Rooij, N. F.  
•
Pretsch, E.
2005
Journal of Electroanalytical Chemistry

The steady-state electrical behavior of cation-selective ionophore membranes with different kinds of ionic additives was studied on a theoretical basis. Membranes with both mobile and fixed anionic sites exhibit nonlinear current-voltage curves, which is in contrast with the ohmic behavior of pure fixed-site membranes. This can be explained from the specific concentration profiles in the membrane, illustrating pronounced polarization effects for the mobile sites. Surprisingly, the influence of the fixed sites on the current response is still observable even when the mobile sites predominate. At high voltages, current saturation occurs by limitations of the back-diffusion of free ionophores. This can be overcome when other, uncomplexed, cations contribute to the current flow. Membranes with both cationic and anionic sites cannot be strongly polarized, in analogy to other systems where an inert electrolyte is confined to a given phase. These membranes respond with current saturation at relatively low voltages. Currents above this limit can be achieved by an additional permeation of anions from the aqueous solution through the membrane, as shown by model calculations. © 2005 Elsevier B.V. All rights reserved.

  • Details
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Type
research article
DOI
10.1016/j.jelechem.2005.04.029
Author(s)
Morf, W. E.
•
de Rooij, N. F.  
•
Pretsch, E.
Date Issued

2005

Published in
Journal of Electroanalytical Chemistry
Volume

581

Issue

2

Start page

265

End page

274

Note

350

Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
SAMLAB  
Available on Infoscience
May 12, 2009
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/39625
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