Investigations on structures, thermal expansion and electrochemical properties of La0.75Sr0.25Cu0.5-xCoxMn0.5O3-delta (x=0, 0.25, and 0.5) as potential cathodes for intermediate temperature solid oxide fuel cells

	Investigations on structures, thermal expansion and electrochemical properties of La0.75Sr0.25Cu0.5-xCoxMn0.5O3-delta (x=0, 0.25, and 0.5) as potential cathodes for intermediate temperature solid oxide fuel cells
	Meng,Junling; Liu,Xiaojuan; Yao,Chuanggang; Zhang,Xiong; Liu,Xiliang; Meng,Fanzhi; Meng,Jian
刊名	electrochimica acta
	2015
卷号	186 页码:262-270
关键词	BRILLOUIN-ZONE INTEGRATIONS ATOMIC LAYER DEPOSITION AUGMENTED-WAVE METHOD ELECTRICAL-PROPERTIES OXYGEN-REDUCTION SOFC STABILITY PRINCIPLES ELECTRODES IMPEDANCE
通讯作者	liu,xj
英文摘要	a series of perovskite oxides have been investigated as excellent potential cathodes for intermediate-temperature solid oxide fuel cells (it-sofcs). in this paper, we take the la0.75sr0.25cu0.5-xcoxmn0.5o3-delta (lsccm, x = 0, 0.25 and 0.5) system as subject, with cu/mn and/or co/mn on b-site and 25% sr-substituted la ions on a-site, to investigate their structures, thermal stability and electrochemical properties. pure rhombohedral crystal with space group r (3) over barc (no. 167) is identified by rietveld refinement of x-ray diffraction data (xrd). it is found that the thermal expansion coefficient (tec) is manageable when co ion is incorporated, and the low tec value ranges from 12.7 x 10(-6) to 15.4 x 10(-6) k-1 that are well compatible with prototypical electrolytes zr0.84y0.16o1.92 (ysz) and ce0.8sm0.2o2-delta (sdc). the dc-conductivity is significantly enhanced from 36.5, 90.5 to 173.7 s cm(-1) at 850 degrees c with the increasing co percent, and accordingly, polarization resistance (r-p) is determined as 0.1291, 0.0835 and 0.0486 v cm(2) at 800 degrees c. the high electrical conductivities and low resistances can be attributed to the strong b-o bond hybridization and oxygen vacancy formation at elevated temperatures with the introduction of co ion, which is consistent with the results of first-principles calculation and thermogravimetric analysis. all these results demonstrate that lsccm series are promising cathodes with controllable tec for it-sofcs. (c) 2015 elsevier ltd. all rights reserved.
收录类别	SCI
语种	英语
WOS记录号	WOS:000366019700034
公开日期	2016-05-31
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/65140]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Meng,Junling,Liu,Xiaojuan,Yao,Chuanggang,et al. Investigations on structures, thermal expansion and electrochemical properties of La0.75Sr0.25Cu0.5-xCoxMn0.5O3-delta (x=0, 0.25, and 0.5) as potential cathodes for intermediate temperature solid oxide fuel cells[J]. electrochimica acta,2015,186:262-270.
APA	Meng,Junling.,Liu,Xiaojuan.,Yao,Chuanggang.,Zhang,Xiong.,Liu,Xiliang.,...&Meng,Jian.(2015).Investigations on structures, thermal expansion and electrochemical properties of La0.75Sr0.25Cu0.5-xCoxMn0.5O3-delta (x=0, 0.25, and 0.5) as potential cathodes for intermediate temperature solid oxide fuel cells.electrochimica acta,186,262-270.
MLA	Meng,Junling,et al."Investigations on structures, thermal expansion and electrochemical properties of La0.75Sr0.25Cu0.5-xCoxMn0.5O3-delta (x=0, 0.25, and 0.5) as potential cathodes for intermediate temperature solid oxide fuel cells".electrochimica acta 186(2015):262-270.