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000857739 005__ 20240711092301.0
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000857739 0247_ $$2URN$$aurn:nbn:de:0001-2019020600
000857739 0247_ $$2ISSN$$a1866-1793
000857739 020__ $$a978-3-95806-374-7
000857739 037__ $$aFZJ-2018-06707
000857739 1001_ $$0P:(DE-Juel1)166023$$aYin, Xiaoyan$$b0$$eCorresponding author$$ufzj
000857739 245__ $$aAging and Degradation Behavior of Electrode Materials in Solid Oxide Fuel Cells (SOFCs)$$f2014-12-01 - 2018-03-31
000857739 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2018
000857739 300__ $$ax, 103 S.
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000857739 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1545294034_3257
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000857739 4900_ $$aSchriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment$$v446
000857739 502__ $$aRWTH Aachen, Diss., 2018$$bDr.$$cRWTH Aachen$$d2018
000857739 520__ $$a(La,Sr)(Co,Fe)O$_{3-δ}$ is one of the most potential cathode materials for solid oxide fuel cell(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 material, the GDC layer and the ZrO$_{2}$-based electrolyte. 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 pCrO$_{3}$ has a stronger temperature dependence than pCrO$_{2}$(OH)$_{2}$, and when considering the reaction between SrO and CrO$_{3}$(g), dependent on different pCrO$_{3}$ and local pO$_{2}$ in the cathode, different Sr-Cr-O secondary phases SrCrO$_{4}$,SrCrO$_{3}$, Sr$_{3}$Cr$_{2}$O$_{8}$ or Sr$_{2}$CrO$_{4}$ could be formed. Additionally, 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, pH$_{2}$O and SrO activity, and can be of the same order of magnitude as pCrO$_{2}$(OH)$_{2}$. Volatile Sr(OH)$_{2}$ diffuse through the porous GDC layer and react with ZrO$_{2}$-based electrolytes to form SrZrO$_{3}$ precipitates. The reaction between gaseous Sr species and an 8YSZ sheet is studied experimentally. The surface of the 8YSZ sheet is investigated by SEM coupled with EDS, confirming the deposition of Sr. Since the reaction between the gaseous Sr species and 8YSZ depends on theZrO$_{2}$ activity in 8YSZ, the ZrO$_{2}$ activity in 8YSZ is measured by Knudsen Effusion Mass Spectrometry. The measured aZrO$_{2}$ shows no temperature dependence, which is around 0.85. A high ZrO$_{2}$ activity in 8YSZ facilitates the reaction between the gaseous Sr species and 8YSZ from a thermodynamic point of view. In addition, first principles phonon calculations combined with quasi-harmonic approximation (QHA) are used to predict the thermal expansion of La$_{0.5}$Sr$_{0.5}$Co$_{0.25}$Fe$_{0.75}$O$_{3}$ (LSCF55). Within the framework of the QHA, the volumetric thermal expansion coefficient of LSCF55 is calculated as $\alpha_{
000857739 536__ $$0G:(DE-HGF)POF3-243$$a243 - Tropospheric trace substances and their transformation processes (POF3-243)$$cPOF3-243$$fPOF III$$x0
000857739 536__ $$0G:(DE-HGF)POF3-135$$a135 - Fuel Cells (POF3-135)$$cPOF3-135$$fPOF III$$x1
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000857739 9141_ $$y2018
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