Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5148001 | International Journal of Hydrogen Energy | 2017 | 9 Pages |
Abstract
One of the technical hurdles to commercialization of intermediate temperature solid oxide fuel cells (IT-SOFCs) is the requirement of highly efficient cathode materials. Herein, we report the evaluation of Sr2Fe1.5Mo0.5âxSnxO6âδ (x = 0, 0.1, 0.3 and 0.5, abbreviated as SFM, SFMS1, SFMS3, and SFS) oxides as cobalt-free cathode materials of IT-SOFCs. XPS analysis demonstrates the presence of variable valences among Fe, Mo and Sn elements, suggesting a small polaron hopping mechanism for electronic conduction. First principle calculations reveal that SFMS3 provides the lowest average formation energy of oxygen vacancy (EvacO*) among these perovskites. The relatively low area specific resistances are obtained with SFMS3 electrode based on La0.8Sr0.2Ga0.8Mg0.2O3âδ electrolytes, indicating its high activity for oxygen reduction reaction. Power density of the single cell using SFMS3 cathode as high as 618 mW cmâ2 at 800 °C is achieved, and operation lasts for 200 h without obvious degradation. The encouraging results promise SFMS3 as an alternative cathode material for IT-SOFCs.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Beibei He, Cheng Gong, Zhenbin Wang, Lichao Jia, Ling Zhao,