High performance BaFe1−xBixO3−Δ as cobalt-free cathodes for intermediate temperature solid oxide fuel cells

Xueqin Song, Shiru Le*, Xiaodong Zhu, Long Qin, Yan Luo, Yanwei Li, Kening Sun, Ying Chen

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摘要

Bi2O3 doped BaFeO3−δ on the B-site as a cobalt free perovskite cathode for intermediate temperature solid oxide fuel cells is evaluated. The BaFe1−xBixO3−δ (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 cm−1 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 BaNb0.05Fe0.95O3−δ. The area specific resistance is only 0.133 Ω cm2 for BFB10 at 750 °C and the average TEC is 26.697 × 10−6 K−1 measured from room temperature to 800 °C. The peak power density of Ni-YSZ|YSZ|GDC|BFB10 cell is 646.28 mW cm−2 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.

源语言英语
页(从-至)15808-15817
页数10
期刊International Journal of Hydrogen Energy
42
24
DOI
出版状态已出版 - 15 6月 2017
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Song, X., Le, S., Zhu, X., Qin, L., Luo, Y., Li, Y., Sun, K., & Chen, Y. (2017). High performance BaFe1−xBixO3−Δ as cobalt-free cathodes for intermediate temperature solid oxide fuel cells. International Journal of Hydrogen Energy, 42(24), 15808-15817. https://doi.org/10.1016/j.ijhydene.2017.05.061