Promoting electric conductivity of MnCo spinel coating by doping transition metals (Cu, Fe) or rare-earth elements (La, Y) for solid oxide fuel cell interconnect

The effects of doping transition metal and rare-earth elements on the Mn1.5Co1.5O4 coating were investigated to improve the oxidation resistance and electrical conductivity of coating/steel. The results show that transition metal improves the coating densification, and rare-earth element inhibits the formation of highly resistive Cr2O3 layers. The modified coating increases the octahedral sites of variable valence ion concentration. The area-specific resistance (ASR) of the modified coating is reduced by 2–3 times compared with that of the conventional MnCo coating. The enhanced antioxidant properties of Cu-modified coatings during short-term oxidation processes.