Abstract
Interconnects in solid oxide fuel cells (SOFCs) oxidize under SOFC operating conditions, leading to formation of Cr-rich oxides. This leads to the formation of chromium-containing vapor-phase species that poisons the SOFC cathodes and lead to long-term degradation in device performance. This necessitates the use of protective coatings on SOFC interconnects. Coatings of three Cu-Mn-O spinel compositions, Cu1.3Mn1.7O4, Cu1.2Mn1.8O4, and CuMn1.8O4, were deposited on Crofer 22 APU substrates by electrophoretic deposition (EPD). The effects of the different deposition parameters and the subsequent thermo-mechanical processing steps in the EPD deposition process were studied. The phase stability and the electrical conductivity of the three materials were measured. Finally, thermogravimetric measurements under oxidizing conditions were carried out to study the effectiveness of the coatings as diffusion barriers. The diffusion coefficients of chromium in the three coatings were calculated from the chromium concentration profile.
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