کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7737869 | 1497982 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A modified liquid-phase-assisted sintering mechanism for La0.8Sr0.2Cr1âxFexO3âδ-A high density, redox-stable perovskite interconnect for solid oxide fuel cells
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A modified liquid-phase-assisted sintering mechanism is employed to improve the sintering abilities of La0.8Sr0.2Cr1âxFexO3âδ powders. A distinct transient liquid phase forms during the sintering process, which spreads into a uniform layer and covers the grain boundaries, thereby enhancing densification. Additionally, it is determined that the amount of liquid phase formed during liquid-phase-assisted sintering significantly affects the densification of doped lanthanum chromites. Relative densities of 94.6% and 96.6% are successfully obtained for La0.8Sr0.2Cr0.6Fe0.4O3âδ and La0.8Sr0.2Cr0.5Fe0.5O3âδ, respectively. Furthermore, these compounds are also redox-stable after being heated to 900 °C in flowing H2 for 6 h. The electrical conductivity increases with Fe-doping levels, and the conductivity of La0.8Sr0.2Cr0.5Fe0.5O3âδ is measured to be 21.88 S cmâ1 in air and 6.45 S cmâ1 in 5% H2/Ar at 800 °C. Therefore, dense La0.8Sr0.2Cr0.5Fe0.5O3âδ is a promising interconnect alternative for solid oxide fuel cells.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 250, 15 March 2014, Pages 152-159
Journal: Journal of Power Sources - Volume 250, 15 March 2014, Pages 152-159
نویسندگان
Tao Wei, Xiaojuan Liu, Chun Yuan, Qingyu Gao, Xianshuang Xin, Shaorong Wang,