Synchrotron X-ray studies of model SOFC cathodes, part I: Thin film cathodes
Abstract
In this work, we present synchrotron x-ray investigations of thin film La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) model cathodes for solid oxide fuel cells, grown on electrolyte substrates by pulse laser deposition, in situ during half-cell operations. We observed dynamic segregations of cations, such as Sr and Co, on the surfaces of the film cathodes. The effects of temperature, applied potentials, and capping layers on the segregations were investigated using a surfacesensitive technique of total external reflection x-ray fluorescence. We also studied patterned thin film LSCF cathodes using high-resolution micro-beam diffraction measurements. We find chemical expansion decreases for narrow stripes. This suggests the expansion is dominated by the bulk pathway reactions. Lastly, the chemical expansion vs. the distance from the electrode contact was measured at three temperatures and an oxygen vacancy activation energy was estimated to be ~1.4 eV.
- Authors:
-
[2];
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
- Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
- National Energy Technology Lab. (NETL), Morgantown, WV (United States); AECOM, Morgantown, WV (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF)
- OSTI Identifier:
- 1411043
- Alternate Identifier(s):
- OSTI ID: 1599464
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Solid State Ionics
- Additional Journal Information:
- Journal Volume: 311; Journal Issue: C; Journal ID: ISSN 0167-2738
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE
Citation Formats
Chang, Kee-Chul, Ingram, Brian, Ilavsky, Jan, Lee, Shiwoo, Fuoss, Paul, and You, Hoydoo. Synchrotron X-ray studies of model SOFC cathodes, part I: Thin film cathodes. United States: N. p., 2017.
Web. doi:10.1016/j.ssi.2017.10.005.
Chang, Kee-Chul, Ingram, Brian, Ilavsky, Jan, Lee, Shiwoo, Fuoss, Paul, & You, Hoydoo. Synchrotron X-ray studies of model SOFC cathodes, part I: Thin film cathodes. United States. https://doi.org/10.1016/j.ssi.2017.10.005
Chang, Kee-Chul, Ingram, Brian, Ilavsky, Jan, Lee, Shiwoo, Fuoss, Paul, and You, Hoydoo. Sat .
"Synchrotron X-ray studies of model SOFC cathodes, part I: Thin film cathodes". United States. https://doi.org/10.1016/j.ssi.2017.10.005. https://www.osti.gov/servlets/purl/1411043.
@article{osti_1411043,
title = {Synchrotron X-ray studies of model SOFC cathodes, part I: Thin film cathodes},
author = {Chang, Kee-Chul and Ingram, Brian and Ilavsky, Jan and Lee, Shiwoo and Fuoss, Paul and You, Hoydoo},
abstractNote = {In this work, we present synchrotron x-ray investigations of thin film La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) model cathodes for solid oxide fuel cells, grown on electrolyte substrates by pulse laser deposition, in situ during half-cell operations. We observed dynamic segregations of cations, such as Sr and Co, on the surfaces of the film cathodes. The effects of temperature, applied potentials, and capping layers on the segregations were investigated using a surfacesensitive technique of total external reflection x-ray fluorescence. We also studied patterned thin film LSCF cathodes using high-resolution micro-beam diffraction measurements. We find chemical expansion decreases for narrow stripes. This suggests the expansion is dominated by the bulk pathway reactions. Lastly, the chemical expansion vs. the distance from the electrode contact was measured at three temperatures and an oxygen vacancy activation energy was estimated to be ~1.4 eV.},
doi = {10.1016/j.ssi.2017.10.005},
journal = {Solid State Ionics},
number = C,
volume = 311,
place = {United States},
year = {Sat Oct 14 00:00:00 EDT 2017},
month = {Sat Oct 14 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
Effect of Microstructure on the Degradation of La 0.6 Sr 0.4 CoO 3– δ Electrodes in Dry and Humid Atmospheres
journal, July 2019
- Egger, A.; Perz, M.; Bucher, E.
- Fuel Cells