Applicability of emf measurements under external load resistance conditions for ion transport number determination
authors Frade, J; Kharton, VV; Yaremchenko, AA; Tsipis, EV
nationality International
journal JOURNAL OF SOLID STATE ELECTROCHEMISTRY
author keywords transference number; emf measurements; mixed conductor; external load; exchange current density
keywords OXYGEN FUGACITY CONTROL; NONFLOWING ATMOSPHERES; ELECTRONIC TRANSPORT; SURFACE EXCHANGE; ELECTROLYTES; CONDUCTION
abstract In order to evaluate the applicability of concentration cells for the ion transference number measurements with external load, the cell response was simulated with variable transport properties of the cell material, external load resistance, geometrical factors such as ion-conducting membrane thickness, and electrode kinetics. This technique is expected to be pertinent when nF/RT < 0.2, except possibly for conditions when the electrode kinetics is dependent on a relatively small limiting current density. In each particular case, the method validity can be verified by testing if the overpotential sum grows faster than current on decreasing the external load resistance. A pyrochlore-type material Gd1.9Ca0.1Ti2O7-delta with dominant oxygen ionic conductivity is used as a study case to demonstrate the criteria proposed to assess the applicability of emf measurements under short-circuit conditions.
publisher SPRINGER
issn 1432-8488
year published 2006
volume 10
issue 2
beginning page 96
ending page 103
digital object identifier (doi) 10.1007/s10008-005-0667-5
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000233466400006
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journal impact factor 2.646
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