Mn_(1.5)Co_(1.5)O_4 protective coating on Crofer22APU produced by thermal co-evaporation for SOFCs

摘要

A thin Mn_(1.5)Co_(1.5)O_4 spinel coating (1 urn) was deposited on Crofer22APU using thermal co-evaporation technique. The electrical conductivity of the Mn_(1.5)Co_(1.5)O_4 coating was found to be 115 s/cm at 800 C in air. Subsequently, a glass ceramic sealant was deposited by slurry on the Mn_(1.5)Co_(1.5)O_4 coating. Thermal cycling tests were performed on Crofer22APU/Mn_(1.5)Co_(1.5)O_4 and Crofer22APU/Mn_(1.5)Co_(1.5)O_4/glass-ceramic samples at 800 C for 500 h in air. An excellent morphological and thermo-mechanical compatibility both of the glass ceramic sealant with Mn_(1.5)Co_(1.5)O_4 and of the Mn_(1.5)Co_(1.5)O_4 coating with the Crofer22APU was observed. EDS analysis revealed the presence of Cr in the Mn_(1.5)Co_(1.5)O_4 coating while no Cr diffusion into the glass ceramic sealant was observed after thermal cycling.