Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7735512 | Journal of Power Sources | 2014 | 7 Pages |
Abstract
A newly developed low-Cr containing Fe-Cr-Co alloy, named as FeCro, is evaluated as a candidate material of metallic interconnects for intermediate temperature solid oxide fuel cells (IT-SOFCs). This alloy possesses excellent oxidation resistance and adequate electrical conductivity at 750 °C in air, and shows slight Cr deposition in/around La0.72Sr0.18MnO3(LSM) electrode under a harsh accelerating condition of 400 mA cmâ2 and 850 °C. The thickness of the oxide scale thermally grown at 750 °C in air for 1000 his less than 1 μm, presenting a double-layered structure with dense (Mn, Cr)3O4 on the top of Cr2O3. The oxidation kinetics at 750 °C obeys the parabolic law with a low rate constant of1.42 Ã 10â15 g2 cmâ4 sâ1. The Cr deposition in/around the LSM electrode in the presence of the FeCro alloy is remarkably reduced, compared to the commercial Crofer 22H alloy. The measured area specific resistance (ASR) at 750 °C in air after 1000 h isothermal oxidation is 14 mΩ cm2. It is the unique microstructure of the formed oxide scale that significantly enhances the resistances of the FeCro alloy to oxidation and Cr volatilization.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Wenying Zhang, Dong Yan, Jie Yang, Jing Chen, Bo Chi, Jian Pu, Jian Li,