Impact of CeCo-Coated Metallic Interconnectors on SOCs Towards Performance, Cr-Oxide-Scale, and Cr-Evaporation
Artikel i vetenskaplig tidskrift, 2024

The performance of a solid oxide cell (SOC) depends on the operating environment. Regarding single cell tests with ideal contacting (gold, platinum, nickel meshes) and inert flow fields (Al2O3), performance is limited by intrinsic losses in the cell. Contact losses and poisoning effects are minimized. In a SOC-stack with metallic interconnectors, performance is affected by contact resistances, chromium (Cr) evaporation, and limitations in gas supply. Here, 1 cm2 single cells were tested with a stack-like contact applying metallic flow fields made from three different steel grades (Crofer 22 APU, AISI 441, UNS S44330) with and without a cerium-cobalt PVD-coating. Cell performance and losses were analyzed by IV-characteristics, impedance spectroscopy, and DRT analysis. For all uncoated interconnectors, significant performance losses due to increased contact losses and air electrode polarization were observed, which is attributed to Cr-oxide scale formation on the metallic interconnectors and Cr-poisoning of the air electrode as revealed by scanning electron microscopy-energy-dispersive X-ray spectroscopy. A CeCo-coating leads to similar oxide scales irrespective of the substrate material. Moreover, with the coating the electrochemical performance drastically improved due to decreased contact losses and an effective blocking of Cr-evaporation leading to a cell performance close to the ideal case for all three steel grades.

solid oxide cell


Ce/Co coating


C. Grosselindemann

Karlsruher Institut für Technologie (KIT)

Mareddy Reddy

Chalmers, Kemi och kemiteknik, Energi och material

H. Störmer

Karlsruher Institut für Technologie (KIT)

D. Esau

Karlsruher Institut für Technologie (KIT)

M. Dorn

Karlsruher Institut für Technologie (KIT)

F. M. Bauer

Karlsruher Institut für Technologie (KIT)

D. Ewald

Karlsruher Institut für Technologie (KIT)

L. Wissmeier

Kerafol Keramische Folien GmbH

Jan Froitzheim

Chalmers, Kemi och kemiteknik, Energi och material

A. Weber

Karlsruher Institut für Technologie (KIT)

Journal of the Electrochemical Society

0013-4651 (ISSN) 1945-7111 (eISSN)

Vol. 171 5 054508





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