Electrophoretically Deposited LaNi0.6Fe0.4O3 Perovskite Coatings on Metallic Interconnects for Solid Oxide Fuel Cells.

Interconnects present major technical challenges in the commercialization of solid oxide fuel cells (SOFCs) with high performance and durability. To mitigate surface oxidation (chromia growth) and chromium evaporation under high-temperature oxidizing conditions, metallic interconnects should be coated with conductive metal oxides. In this study, we report a protective coating based on perovskite-type LaNi_0.6Fe_0.4O₃ (LNF) fabricated by a facile electrophoretic deposition (EPD) process. LNF powders with a narrow size distribution are synthesized by using the Pechini method. EPD parameters, including solid content in a suspension, deposition time, and applied voltage, are adjusted to control the microstructure, morphology, and thickness of the LNF coating. An LNF coating of ~7.7 μm thickness is fabricated on an SOFC interconnect via EPD under optimized conditions. The electrophoretically deposited LNF layer serves as an effective protective coating for SOFC interconnects, showing a low resistance (~4.2 mΩ cm²) as well as high stability during long-term operation at 800°C. [ABSTRACT FROM AUTHOR]