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Reactive element-doped (Co,Mn) 3 O 4 spinel is considered as the most promising coating system to protect ferritic alloys for solid oxide fuel cell interconnect application. In this paper, a CeO 2 -doped (Co,Mn) 3 O 4 coating was synthesized on a Crofer 22 APU alloy substrate via electrolytic codeposition of a composite layer consisting of a Co matrix and embedded Mn 3 O 4 /CeO 2 particles, followed by thermal conversion of the deposited layer in air at elevated temperatures. After oxidation at 800°C in air for 250 h, no Cr penetration was detected in both the CeO 2 -doped and CeO 2 -free spinel coatings. However, CeO 2 doping significantly reduced the Cr 2 O 3 scale growth at the coating/substrate interface. An area specific resistance of 8 m ·cm 2 at800°C was achieved for the CeO 2 -doped coating sample, which was much lower than that of the CeO 2 -free coating sample (13 m ·cm 2 ) or the bare substrate (24 m ·cm 2 ) at the same temperature.CeO 2 doping in the spinel coating also improved the performance stability of the anode-supported cell in contact with the alloy interconnect.

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