Preparation and properties of rare earth co-doped Ce0.8Sm0.2-xYxO1.9 electrolyte materials for SOFC

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	Preparation and properties of rare earth co-doped Ce0.8Sm0.2-xYxO1.9 electrolyte materials for SOFC
	X. Q. Sha ; Z. Lu ; X. Q. Huang ; J. P. Miao ; L. Jia ; X. S. Xin ; W. H. Su
刊名	Journal of Alloys and Compounds
	2006
卷号	424 期号:1-2 页码:315-321
关键词	SOFC co-doped ceria electrolyte oxide fuel-cells ceria electrolyte solid-solutions lattice-parameters crystal-structure gd conductivity temperature sm re
ISSN号	0925-8388
中文摘要	Ceria-rare earth solid solutions are known as solid electrolytes with potential applications in solid oxide fuel cell (SOFC). Trivalent rare earth ions enter into solid solution introducing anion vacancies for charge compensation. These oxygen vacancies are quite mobile at moderate temperatures giving rise to a comparatively high ionic conduction. In this study, rare-earth co-doped Ce0.8Sm0.2-xYxO1.9 (x = 0.0-0.20) fine powders were prepared by a sol-gel method. The XRD results showed that all powders crystallite calcined at 800 degrees C were single phase with cubic fluorite structure; the average crystallite size was between 24 and 35 nm, which was in good agreement with the results of TEM and particle size distribution measurements. The SEM results exhibited that electrolyte pellets sintered at 1400 degrees C were dense, and the relative densities of these pellets were over 99%. Impedance spectra analysis of these electrolytes has been performed at 250-850 degrees C. The results displayed that Ce0.8Sm0.15Y0.05O1.9 and Ce0.8Sm0.1Y0.1O1.9 appeared higher conductivity and lower activation energy than the singly doped ceria with the same dopant concentration (20% trivalent rare earth) at the temperature range of 550-700 degrees C. The maximum power density and the maximum current density for the single SOFC based on the two samples were higher than singly doped sample with the same vacancy concentration. Therefore, it is concluded that co-doping with an appropriate ratio of samarium and yttrium can further improve the electrical performance of ceria-based electrolytes. (c) 2006 Elsevier B.V. All rights reserved.
原文出处	://WOS:000241414900059
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/34449]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Q. Sha,Z. Lu,X. Q. Huang,et al. Preparation and properties of rare earth co-doped Ce0.8Sm0.2-xYxO1.9 electrolyte materials for SOFC[J]. Journal of Alloys and Compounds,2006,424(1-2):315-321.
APA	X. Q. Sha.,Z. Lu.,X. Q. Huang.,J. P. Miao.,L. Jia.,...&W. H. Su.(2006).Preparation and properties of rare earth co-doped Ce0.8Sm0.2-xYxO1.9 electrolyte materials for SOFC.Journal of Alloys and Compounds,424(1-2),315-321.
MLA	X. Q. Sha,et al."Preparation and properties of rare earth co-doped Ce0.8Sm0.2-xYxO1.9 electrolyte materials for SOFC".Journal of Alloys and Compounds 424.1-2(2006):315-321.