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@ARTICLE{Yin:838483,
author = {Yin, Xiaoyan and Bencze, Laszlo and Motalov, Vladimir and
Spatschek, Robert and Singheiser, Lorenz},
title = {{T}hermodynamic {P}erspective of {S}r-{R}elated
{D}egradation {I}ssues in {SOFC}s},
journal = {International journal of applied ceramic technology},
volume = {15},
issn = {1546-542X},
address = {Westerville, Ohio},
publisher = {Wiley-Blackwell},
reportid = {FZJ-2017-07080},
pages = {380–390},
year = {2018},
abstract = {(La,Sr)(Co,Fe)O3-δ is very common as cathode material in
SOFC applications. Sr in this type of cathode material is
very reactive to form secondary phases with other oxides,
which affect micro-structures and properties of the cathode
materials, GDC layers and ZrO2-based electrolytes. The
Sr-related degradation issues, Cr poisoning and volatile Sr
species formation, are studied. As supplement to existing
experimental knowledge on Cr poisoning, specific
thermodynamic aspects for Cr poisoning are discussed. The
thermodynamic calculations show that the partial pressure
pCrO3 has a stronger temperature dependence than pCrO2(OH)2,
and when considering the reaction between SrO and CrO3(g),
dependent on different pCrO3 and pO2, different Sr–Cr–O
compounds SrCrO4, SrCrO3, Sr3Cr2O8 or Sr2CrO4 could be
formed. In addition, thermodynamic calculations show that in
the presence of water vapor, formation of volatile Sr(OH)2
is possible as well. pSr(OH)2 depends on temperature, pH2O
and SrO activity and can be of the same order of magnitude
as pCrO2(OH)2. Volatile Sr(OH)2 can diffuse through the
porous GDC layer and react with ZrO2-based electrolytes to
form SrZrO3 precipitates. The reaction between gaseous Sr
species and 8YSZ sheet is studied experimentally. The
surface of the 8YSZ sheet is investigated by SEM coupled
with EDS, confirming the deposition of Sr.},
cin = {IEK-2},
ddc = {620},
cid = {I:(DE-Juel1)IEK-2-20101013},
pnm = {111 - Efficient and Flexible Power Plants (POF3-111)},
pid = {G:(DE-HGF)POF3-111},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000424816400013},
doi = {10.1111/ijac.12809},
url = {https://juser.fz-juelich.de/record/838483},
}