کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7991483 | 1516141 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ca3Co2O6Ce0.8Sm0.2O1.9 composite cathode material for solid oxide fuel cells
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Oxygen-ion transport property greatly affects the electro-catalytic activity of a cathode material in the solid oxide fuel cells. In this work, to enhance the electrochemical activity of hexagonal Ca3Co2O6 cathode, fast ion-conductor Ce0.8Sm0.2O1.9 is introduced as the second phase, and thus a binary composite is developed, expressed as (1-x)Ca3Co2O6/xCe0.8Sm0.2O1.9 in nominal form. The composites are prepared by one-pot method and X-ray diffraction results reveal that these compositional phases are highly compatible. Analysis of X-ray photoelectron spectroscopy indicates the existence of Co3+ and Co2+ mixed valences in the composites. Compared with single-phase Ca3Co2O6, thermal expansion coefficient of the composite is favorably low and matches better with the electrolyte of solid oxide fuel cells. Test of electrical conductivity shows that the composites are comparable to the pure Ca3Co2O6 in charge transport capacity. Electrochemical measurements indicate that the xâ¯=â¯0.5 composite cathode exhibit the lowest area specific resistance and produces the maximum power density. In the electrolyte-supported single cell along with Ni-SDC cermet as anode and pure H2 gas as fuel, power density peak of 680â¯mWcmâ2 is achieved from the xâ¯=â¯0.5 composite cathode at 800â¯Â°C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 753, 15 July 2018, Pages 292-299
Journal: Journal of Alloys and Compounds - Volume 753, 15 July 2018, Pages 292-299
نویسندگان
Fushao Li, Shubiao Xia, Yingxian Xu, Yuxing Yan, Chengke Sun, Long Jiang, Yunhui Huang,