Alternating-Current Electrophoretic Deposition of Spinel Coatings on Porous Metallic Substrates for Solid Oxide Fuel Cell Applications

The performance of solid oxide fuel cells (SOFCs) can be degraded by “chromium poisoning” where thermally grown Cr2O3 on metallic surfaces forms volatile Cr-containing species that are redeposited active regions the cathode. This phenomenon is further exacerbated for porous interconnects and metal-supported electrodes due to their large surface-to-volume ratios. In this study, electrophoretic deposition (EPD) CuNi0.2Mn1.8O4 spinel powders SUS430 substrates using alternating current (AC) was explored. Two-step densification heat treatment used form a thin, uniform, protective coating. area-specific resistance (ASR) weight gain were tracked during 100-h oxidation tests at 700°C in air. results showed that, despite considerable complexity sample shape, AC EPD able coating layer significantly limited growth rate (TGO) reducing kg value factor 25.