Reassessment of conventional polarization technique to measure partial electronic conductivity of electrolytes

Authors
Lee, Kyung-RyulLee, Jong-HoYoo, Han-Ill
Issue Date
2010-06-03
Publisher
ELSEVIER SCIENCE BV
Citation
SOLID STATE IONICS, v.181, no.15-16, pp.724 - 729
Abstract
Two-probe Hebb-Wagner polarization technique has been widely used to determine the partial electronic conductivity of an ionic conductor. The crucial, but often ignored pre-requisite with this technique is that the electronic over-potential at the electrodes be small enough to be neglected. In our own earlier experiences, however, this pre-requisite is not always true. In this study, we constructed a noble, 4-probe polarization cell, which allows measuring the true partial electronic conductivity without any electrode over-potential problem. We applied this new technique to 10 m/o Gd-doped CeO2 (GDC) and compared the results with those from the conventional 2-probe technique. According to the comparison, electronic conductivity of GDC from 2-probe technique is always underestimated by 2-3 times while the 4-probe technique has turned out to be in perfect agreement with the estimated value from the total conductivity in its exclusively n-type regime. In this study we will report the experimental details of this noble 4-probe polarization technique as well as its viability in partial conductivity measurement. (C) 2010 Elsevier B.V. All rights reserved.
Keywords
HEBB-WAGNER POLARIZATION; SOLID ELECTROLYTE; HEBB-WAGNER POLARIZATION; SOLID ELECTROLYTE; Hebb-Wagner; Polarization experiment; Partial conductivity; GDC; SOFC
ISSN
0167-2738
URI
https://pubs.kist.re.kr/handle/201004/131339
DOI
10.1016/j.ssi.2010.03.015
Appears in Collections:
KIST Article > 2010
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