TY  - JOUR
AU  - Beez, Alexander
AU  - Yin, Xiaoyan
AU  - Menzler, Norbert H.
AU  - Spatschek, Robert
AU  - Bram, Martin
TI  - Insight into the reaction mechanism of (La0.58Sr0.40)(Co0.20Fe0.80)O3-δ cathode with volatile chromium species at high current density in a solid oxide fuel cell stack
JO  - Journal of the Electrochemical Society
VL  - 164
IS  - 10
SN  - 0013-4651
CY  - Pennington, NJ
PB  - Electrochemical Soc.
M1  - FZJ-2017-03989
SP  - F3028-F3034
PY  - 2017
AB  - Anode-supported solid oxide fuel cells with different Cr protection layers on the metallic interconnect were operated in a short stack at 700°C for 1240 h. The current density was raised sequentially from 0.5 A cm−2 during the first 240 h of operation to 0.75 A cm−2 for a further 1000 h. After operation, the (La,Sr)(Co,Fe)O3-δ (LSCF) cathode layers were analyzed with respect to Cr interaction by both wet chemical and microstructural methods. For cells equipped with interconnects coated with a dense APS protection layer, the amount of Cr on the cathode was in the range of a few μg. For cells with a porous WPS coating on the interconnect, the amount of Cr was in the range of 110–160 μg cm−2 and Cr-containing phases were detected by SEM analysis both on top of the cathode layer and also at the LSCF/GDC interface, which has rarely been observed before. In addition, a deterioration of the cathode microstructure near the LSCF/GDC interface was observed. With respect to the high current density during operation, a theory was developed which explains both the Cr deposition at the LSCF/GDC interface and also the deterioration of the cathode.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000413258100002
DO  - DOI:10.1149/2.0051710JES
UR  - https://juser.fz-juelich.de/record/830443
ER  -