Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7739453 | Journal of Power Sources | 2013 | 12 Pages |
Abstract
Spinel oxides with the general formula of (Mn,B)3O4 (BÂ =Â Co, Fe) were used as barrier materials between the cathode and the metallic interconnect to reduce the rate of cathode degradation by Cr poisoning. The effect of doping at the B position was investigated terms of microstructure and electrical conductivity to determine its behaviour and effectiveness as a protective layer in contact with three metallic materials (Crofer 22 APU, SS430 and Conicro 4023Â W 188). The analysis showed that the use of these materials considerably decreased the reactivity and diffusion of Cr between the cathode and the metallic interconnects. The protective layer doped with Fe at the B position exhibited the least amount of reactivity with the interconnector and cathode materials. The worst results were observed for SS430 cells coated with a protective layer perhaps due to their low Cr content. The Crofer 22 APU and Conicro 4023Â W 188 samples exhibited very similar conductivity results in the presence of the MnCo1.9Fe0.1O4 protective coating. As a result, these two material combinations are a promising option for use as bipolar plates in SOFC.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Verónica Miguel-Pérez, Ana MartÃnez-Amesti, MarÃa Luisa Nó, Aitor Larrañaga, MarÃa Isabel Arriortua,