Mn-Co spinel coatings on Crofer 22 APU by electrophoretic deposition: Up scaling, performance in SOFC stack at 850 °C and compositional modifications

Ceramic coatings for metallic interconnects play a key role in limiting corrosion and chromium evaporation solid oxide cells. This study presents the upscaling of electrophoretic deposition (EPD) technique to process Mn-Co spinels on real-dimension Crofer 22 APU test SOFC stack. Area specific resistance long-term conducted 5000 h at 850 °C demonstrated that two-steps sintering has significant influence coating performance; an area degradation rate 0.5 mΩ cm2 kh−1 is recorded. Stack test, operated fuel cell mode 3000 under application 227 mA/cm², including 5 thermal cycles, effectiveness electrophoretically deposited spinel scale growth APU. An advanced post mortem investigation showed EPD ceramic coating, even when considering different complex surfaces