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| Hauptseite > Workflowsammlungen > Publikationsgebühren > 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 |
| Journal Article | FZJ-2017-03989 |
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2017
Electrochemical Soc.
Pennington, NJ
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Please use a persistent id in citations: http://hdl.handle.net/2128/14681 doi:10.1149/2.0051710JES
Abstract: 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.
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