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Degradation of hydration kinetics of proton-conducting Ba(Zr0.84Y0.15Cu0.01)O3-delta during conductivity-relaxation experiment

Authors
Choi, Sung MinLee, Jong-HeunHong, JongsupYoon, Kyung JoongSon, Ji-WonKim, Byung-KookLee, Hae-WeonLee, Jong-Ho
Issue Date
15-11월-2016
Publisher
ELSEVIER SCIENCE BV
Keywords
Proton conducting oxide; Hydration kinetic; Electrical conductivity relaxation; Surface contamination; Degradation of surface kinetics
Citation
JOURNAL OF POWER SOURCES, v.332, pp.299 - 304
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF POWER SOURCES
Volume
332
Start Page
299
End Page
304
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/86820
DOI
10.1016/j.jpowsour.2016.09.129
ISSN
0378-7753
Abstract
The chemical-diffusion and surface-exchange coefficients of a proton-conducting oxide, i.e., Ba(Zr0.84Y0.15Cu0.01)O3-delta upon a sudden change of water-vapor pressure at a fixed oxygen partial pressure are investigated via a conductivity relaxation technique. Conductivity relaxation during the hydration/dehydration process follows typical two-fold non-monotonic behavior that can be explained by decoupled chemical diffusion of H and O. However, the temperature dependence of the measured chemical-diffusion and surface-exchange coefficients is significantly different depending on the direction of the temperature change. In this study, we attempt to identify the origin of these unusual behaviors during the conductivity relaxation experiment via thorough microstructural and compositional analyses on sample surface. (C) 2016 Elsevier B.V. All rights reserved.
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