کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5148001 | 1497362 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Novel, cobalt-free, and highly active Sr2Fe1.5Mo0.5âxSnxO6âδ cathode materials for intermediate temperature solid oxide fuel cells
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 42, Issue 15, 13 April 2017, Pages 10308-10316
Journal: International Journal of Hydrogen Energy - Volume 42, Issue 15, 13 April 2017, Pages 10308-10316
نویسندگان
Beibei He, Cheng Gong, Zhenbin Wang, Lichao Jia, Ling Zhao,