Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5146467 | International Journal of Hydrogen Energy | 2017 | 10 Pages |
Abstract
Bi2O3 doped BaFeO3âδ on the B-site as a cobalt free perovskite cathode for intermediate temperature solid oxide fuel cells is evaluated. The BaFe1âxBixO3âδ (BFBx) powders are synthesized by solid state reaction. It is found that Bi2O3 doping stabilizes the BaFeO3 cubic phase. The new cathode is compatible with Gd0.1Ce0.9O1.95 even calcined at 1000 °C for 10 h. The electronic conductivity shows a transformation from semiconductor to metal conductor, and achieves its maximum value of 28.1 S cmâ1 for BFB10 at 800 °C. The δ is as high as 0.408 for BFB10 determined by iodometric titration. This leads to the free volume in crystal lattice of BFB10 21.60% higher than that of BaNb0.05Fe0.95O3âδ. The area specific resistance is only 0.133 Ω cm2 for BFB10 at 750 °C and the average TEC is 26.697 Ã 10â6 Kâ1 measured from room temperature to 800 °C. The peak power density of Ni-YSZ|YSZ|GDC|BFB10 cell is 646.28 mW cmâ2 at 750 °C, higher than that of single cell using LSCF as cathode. These show that BFBx perovskite oxides with cubic phase are promising cathodes for intermediate temperature solid oxide fuel cells.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Xueqin Song, Shiru Le, Xiaodong Zhu, Long Qin, Yan Luo, Yanwei Li, Kening Sun, Ying Chen,