Self-healing properties of Ce/Co-coated stainless steel under simulated intermediate temperature solid oxide fuel cell conditions
Artikel i vetenskaplig tidskrift, 2021

The interconnects used in solid oxide fuel cells (SOFC) are usually shaped into a corrugated form that creates gas channels. Coatings are applied onto an interconnect to increase its longevity by reducing Cr(VI) evaporation and oxide scale growth. To date many manufacturers first deform the interconnect and then apply the coating. However, the reverse (hereinafter termed pre-coating) would be more cost-effective, because large-scale roll-to-roll coating processes could then be used instead of batch coating processes. The drawback of this method is that cracks are introduced into the coating during deformation. The present work shows that the cracks heal after relatively short exposure times for the often-used Ce/Co coating (10 nm Ce and 640 nm Co) even at low operating temperatures (650 °C and 750 °C). The Cr evaporation rate of pre-coated deformed Ce/Co-coated AISI 441, even though slightly elevated in the beginning of the exposure, decreases and stabilizes to rates that are comparable to that of undeformed Ce/Co-coated AISI 441. SEM micrographs show that the cracks introduced during the shaping of the interconnect heal after roughly 70 h of exposure at 750 °C and 360 h of exposure at 650 °C.



Solid oxide fuel cell


Ce/Co coating



Claudia Goebel

Chalmers, Kemi och kemiteknik, Energi och material

Vijayshankar Asokan

Chalmers, Kemi och kemiteknik, Energi och material

Sarah Khieu

Chalmers, Kemi och kemiteknik, Energi och material

Jan-Erik Svensson

Chalmers, Kemi och kemiteknik, Energi och material

Jan Froitzheim

Chalmers, Kemi och kemiteknik, Energi och material

Surface and Coatings Technology

0257-8972 (ISSN)

Vol. 428 127894


Bearbetnings-, yt- och fogningsteknik

Annan kemiteknik

Annan materialteknik



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