Study of the relationship between the local geometric structure and the stability of La0.6Sr0.4MnO3-delta and La0.6Sr0.4FeO3-delta electrodes

doi:10.1007/s41365-019-0550-1

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Study of the relationship between the local geometric structure and the stability of La0.6Sr0.4MnO3-delta and La0.6Sr0.4FeO3-delta electrodes
	Guan, CZ ; Zhou, J ; Bao, HL ; Peng, C ; Lin, X ; Xiao, GP ; Wang, JQ ; Zhu, ZY
刊名	NUCLEAR SCIENCE AND TECHNIQUES
	2019
卷号	30 期号:2 页码:—
关键词	OXIDE FUEL-CELLS LA0.6SR0.4CO0.2FE0.8O3-DELTA CATHODES SURFACE SEGREGATION ION TRANSPORT PERFORMANCE OXYGEN DIFFUSION SR
ISSN号	1001-8042
DOI	10.1007/s41365-019-0550-1
文献子类	期刊论文
英文摘要	Sr-substituted ABO(3) perovskite oxides such as La0.6Sr0.4MnO3-delta (LSM) and La0.6Sr0.4FeO3-delta (LSF) are widely used as oxygen electrode materials in solid oxide cells. The substituted Sr is not adequately stable under the operating conditions, because of the surface segregation of Sr. Herein, we focused on investigating the relationship between the local geometric structure due to Sr substitution and stability of LSM and LSF. We characterized the local geometric structure of Sr atoms via X-ray absorption spectroscopy. A greater Debye-Waller factor and a longer bond length of both the second and third Sr-O shells were observed in LSF, which demonstrates that LSF has a higher local structural disorder and that Sr in LSF requires less energy to segregate. After 20 h of heat treatment in the presence of a Fe-Cr alloy interconnect, the Sr/La molar ratio on LSF was observed to be much larger than that on LSM. This result unequivocally suggests that Sr in LSF is not as stable as in LSM, and the reaction between Sr and Cr accelerates the Sr surface segregation in LSF.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/31836]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Chinese Acad Sci, Dept Molten Salt Chem & Engn, Key Lab Interfacial Phys & Technol, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Guan, CZ,Zhou, J,Bao, HL,et al. Study of the relationship between the local geometric structure and the stability of La0.6Sr0.4MnO3-delta and La0.6Sr0.4FeO3-delta electrodes[J]. NUCLEAR SCIENCE AND TECHNIQUES,2019,30(2):—.
APA	Guan, CZ.,Zhou, J.,Bao, HL.,Peng, C.,Lin, X.,...&Zhu, ZY.(2019).Study of the relationship between the local geometric structure and the stability of La0.6Sr0.4MnO3-delta and La0.6Sr0.4FeO3-delta electrodes.NUCLEAR SCIENCE AND TECHNIQUES,30(2),—.
MLA	Guan, CZ,et al."Study of the relationship between the local geometric structure and the stability of La0.6Sr0.4MnO3-delta and La0.6Sr0.4FeO3-delta electrodes".NUCLEAR SCIENCE AND TECHNIQUES 30.2(2019):—.