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Metallic/Ceramic (Fe-22Cr mesh/ LaNi0.6Fe0.4O3-δ) Composite as Contact Material for SOFCs
A Fe-22Cr mesh/LaNi0.6Fe0.4O3-δ composite, obtained via dip coating technique, was machined using a femtosecond laser as a possible gas permeable contact layer for solid oxide fuel cells (SOFCs). Both electrical performance and processing reproducibility of {Crofer22APU channelled interconnect/contact layer/La0.6Sr0.4FeO3 cathode} structure were studied through ASR testing on four replicas. In addition, the long-term behaviour of this system at 800 ºC was determined using energy dispersive X-ray spectroscopy (EDX). The metallic and ceramic parts were quantitatively analysed using EDX, focusing on different positions of the sample. A chromium content reduction in both the interconnect and mesh was observed, accompanied by a Cr enrichment in LaNi0.6Fe0.4O3-d (LNF). Considering the obtained results, the developed setup showed an adequate reproducibility and only a short-range damage caused by the laser irradiation.
Keywords: SOFC; contact layer, metallic interconnect, contact resistance; chromium poisoning; femtosecond laser.
Acknowledgements
This research has been funded by Ministerio de Economía y Competitividad (MAT2013-42092-R) and the Dpto. Educación, Política Lingüística y Cultura of the Basque Goverment (Research Group of the Basque University System IT-630-13). The authors wish to thank SGIker-UPV/EHU technical and human support. Dr. Sergio Fernandez Armas is acknowledged for useful scientific help in discussion of EDX measurements. The authors would also like to express their gratitude to Dr. Raúl Montero Santos for helping with femtosecond laser measurements. A. Morán-Ruiz thanks UPV/EHU for funding her PhD work.