کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5149460 | 1497889 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation of Sc doped Sr2Fe1.5Mo0.5O6 as a cathode material 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
In this work we show that the performance of a Sr2Fe1.5Mo0.5O6 cathode can be improved by scandium substitutional doping. Herein Sr2Fe1.5-xScxMo0.5O6 (SFScxM) compounds are synthesized with a doping value (x) varying from 0 to 0.2, using a glycine-nitrate combustion progress. The phase structure and morphology are characterized by X-ray powder diffraction and scanning electron microscopy showing a perovskite structure and a porous microstructure when doping between 0 and 0.1. X-ray photoelectron spectroscopy results indicate that the Sc-doping has a clear effect on Fe2+/Fe3+ and Mo6+/Mo5+ ratios. On cells consisting of SFScxM electrodes and La0.8Sr0.2Ga0.8Mg0.2O3 electrolytes, Sc doping is found to be very effective in reducing the interfacial polarization resistance. Impedance data analysis of SFSc0.05M cathode at a variety of oxygen partial pressures indicates that the rate limiting steps are the dissociation of adsorbed molecular oxygen for the high-frequency arc and the migration of oxygen ions to the triple phase boundary for the low-frequency arc, respectively. The highest single cell peak power density is obtained with the SFSc0.05M cathode reaching 1.23 W cmâ2 at 800 °C. The results suggest that Sc-doping of SFScxM can substantially improve the electrochemical performance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 343, 1 March 2017, Pages 237-245
Journal: Journal of Power Sources - Volume 343, 1 March 2017, Pages 237-245
نویسندگان
Wang Sun, Peiqian Li, Chunming Xu, Linkun Dong, Jinshuo Qiao, Zhenhua Wang, David Rooney, Kening Sun,