Journal
JOURNAL OF POWER SOURCES
Volume 283, Issue -, Pages 151-161Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.02.064
Keywords
SOFC; Cathode degradation; LSCF; SEM; TOF-SIMS; TEM
Funding
- HyFC - The Danish Hydrogen and Fuel Cell Academy
- EUDP (Danish Energy Agency) [64012-0225]
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Degradation phenomena of La0.58Sr0.4Co0.2Fe0.8O3/Ce0.9Gd0.1O2 (LSCF/CGO) cathodes were investigated via post-mortem analyses of an experimental solid oxide fuel cell (SOFC) stack tested at 700 degrees C for 2000 h using advanced electron microscopy (SEM-EDS, HR-TEM-EDS) and time-of-flight secondary ion mass spectrometry (TOF-SIMS). Similar studies were carried out on non-tested reference cells for comparison. The analysis focused on the LSCF/CGO cathode and the CGO barrier layer, as the cathode degradation can be a major contributor to the overall degradation in this type of SOFC. SEM-EDS and TOF-SIMS were used to investigate inter-diffusion across the barrier layer electrolyte interface and the barrier layer cathode interface. In addition, TOF-SIMS data were employed to investigate impurity distribution before and after testing. HR-TEM-EDS was used to investigate possible phase segregation in the LSCF and to look for reaction between the phases. The results show that phase separation and inter-diffusion across the cathode barrier layer interface and the barrier layer electrolyte interface happened mainly during sintering and cathode firing, and to a very little degree during the test period. (C) 2015 Elsevier B.V. All rights reserved.
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