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Comparison of Ce/Co and Ce/FeNi coatings for interconnects in solid oxide electrolysis.

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Title: Comparison of Ce/Co and Ce/FeNi coatings for interconnects in solid oxide electrolysis.
Authors: Reddy, Mareddy Jayanth1 (AUTHOR), Goebel, Claudia2 (AUTHOR), Valot, Anabelle3 (AUTHOR), Kiebach, Ragnar2 (AUTHOR), Svensson, Jan-Erik1 (AUTHOR), Frandsen, Henrik Lund2 (AUTHOR), Froitzheim, Jan1 (AUTHOR) jan.froitzheim@chalmers.se
Source: International Journal of Hydrogen Energy. Jan2026, Vol. 203, pN.PAG-N.PAG. 1p.
Subjects: Oxidation kinetics, Surface coatings, Surface resistance, Interfaces (Physical sciences), Solid oxide fuel cell electrodes
Abstract: Manganese Cobalt oxide (MCO) coatings have been extensively studied for interconnect applications in solid oxide fuel cells (SOFC). Nevertheless, Co is a critical raw material and efforts are taken to replace it. Ce/FeNi coatings are proposed as an alternative and compared to Ce/Co on AISI 441. Chromium evaporation behaviour, oxidation kinetics, interfacial fracture energy, and area-specific resistance (ASR) of the coating and steels were investigated for up to 3,850 h at 850 °C. Ce/FeNi coatings were not found to be as effective as Ce/Co coatings in preventing chromium evaporation. Nevertheless, Ce/FeNi coated steels showed 50 % lower parabolic rate constant and ASR than Ce/Co coated steel. Additionally, the fracture energy of the adherence of the Ce/FeNi coating to the steel was measured at 750 and 850 °C. The Ce/FeNi coating adherence to the steel greatly outperformed the Ce/Co coating adherence. Furthermore, while the fracture energy of the Ce/Co coating decreases with exposure time, it increases over time for the Ce/FeNi coating. • Ce/FeNi- and Ce/Co-coated AISI 441 were investigated for up to 3,850 h at 850 °C. • Ce/FeNi coated steel exhibits higher Cr(VI) evaporation but a lower oxidation rate. • ASR measurements for Ce/FeNi coated steel were almost 50 % lower than Ce/Co. • Ce/FeNi coated steel had higher fracture toughness than Ce/Co. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Manganese Cobalt oxide (MCO) coatings have been extensively studied for interconnect applications in solid oxide fuel cells (SOFC). Nevertheless, Co is a critical raw material and efforts are taken to replace it. Ce/FeNi coatings are proposed as an alternative and compared to Ce/Co on AISI 441. Chromium evaporation behaviour, oxidation kinetics, interfacial fracture energy, and area-specific resistance (ASR) of the coating and steels were investigated for up to 3,850 h at 850 °C. Ce/FeNi coatings were not found to be as effective as Ce/Co coatings in preventing chromium evaporation. Nevertheless, Ce/FeNi coated steels showed 50 % lower parabolic rate constant and ASR than Ce/Co coated steel. Additionally, the fracture energy of the adherence of the Ce/FeNi coating to the steel was measured at 750 and 850 °C. The Ce/FeNi coating adherence to the steel greatly outperformed the Ce/Co coating adherence. Furthermore, while the fracture energy of the Ce/Co coating decreases with exposure time, it increases over time for the Ce/FeNi coating. • Ce/FeNi- and Ce/Co-coated AISI 441 were investigated for up to 3,850 h at 850 °C. • Ce/FeNi coated steel exhibits higher Cr(VI) evaporation but a lower oxidation rate. • ASR measurements for Ce/FeNi coated steel were almost 50 % lower than Ce/Co. • Ce/FeNi coated steel had higher fracture toughness than Ce/Co. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2025.152996