Thermal, electrical, and electrochemical properties of Lanthanum-doped Ba0.5Sr0.5Co0.8Fe0.2O3-delta

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	Thermal, electrical, and electrochemical properties of Lanthanum-doped Ba0.5Sr0.5Co0.8Fe0.2O3-delta
	S. Y. Li; Z. Lu; X. Q. Huang; B. Wei; W. H. Su
	2007
发表期刊	Journal of Physics and Chemistry of Solids
ISSN	0022-3697
卷号	68 期号:9 页码:1707-1712
摘要	Crystal structure, thermogravimetry (TG), thermal expansion coefficient (TEC), electrical conductivity and AC impedance of (Ba0.5Sr0.5)(1-x)LaxCo0.8Fe0.2O3-delta (BSLCF; 0.05 <= x <= 0.20) were studied in relation to their potential use as intermediate temperature solid oxide fuel cell (IT-SOFC) cathode. A single cubic pervoskite was observed by X-ray diffraction (XRD). The TEC of BSLCF was increasing slightly with the increasing content of La, and all the compounds showed abnormal expansion at high temperature. Proved by the TG result, it was associated with the loss of lattice oxygen. The electrical conductivity, which is the main defect of Ba0.5Sr0.5 Co0.8Fe0.2O3-delta (BSCF), was improved by La doping, e.g., the compound of x = 0.20 demonstrated a conductivity of sigma = 376 S cm(-1) at 392 degrees C. The increase of electrical conductivity resulted from the increased concentration of charge carrier induced by La doping. In addition, the AC impedance revealed the better electrochemical performance of BSLCF. For example, at 500 degrees C, the sample with composition x = 0.15 yielded the resistance values of 2.12 Omega cm(2), which was only 46% of BSCF. (C) 2007 Elsevier Ltd. All rights reserved.
部门归属	harbin inst technol, ctr condensed matter sci & technol, harbin 150001, peoples r china. heilongjiang prov univ, harbin inst technol, key lab condensed matter sci & technol, harbin 150001, peoples r china. jilin univ, dept condensed matter phys, changchun 130023, peoples r china. acad sinica, int ctr mat phys, shenyang 110015, peoples r china.;su, wh (reprint author), harbin inst technol, ctr condensed matter sci & technol, harbin 150001, peoples r china;suwenhui@hit.edu.cn
关键词	X-ray Diffraction Electrical Conductivity Electrochemical Properties Thermal Expansion Oxide Fuel-cells Performance Evaluation Perovskite Oxides Cathode Sofcs La1-xsrxco1-yfeyo3 Electrolyte Anode
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WOS记录号	WOS:000249770000013
引用统计	被引频次：57[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33649
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. Y. Li,Z. Lu,X. Q. Huang,et al. Thermal, electrical, and electrochemical properties of Lanthanum-doped Ba0.5Sr0.5Co0.8Fe0.2O3-delta[J]. Journal of Physics and Chemistry of Solids,2007,68(9):1707-1712.
APA	S. Y. Li,Z. Lu,X. Q. Huang,B. Wei,&W. H. Su.(2007).Thermal, electrical, and electrochemical properties of Lanthanum-doped Ba0.5Sr0.5Co0.8Fe0.2O3-delta.Journal of Physics and Chemistry of Solids,68(9),1707-1712.
MLA	S. Y. Li,et al."Thermal, electrical, and electrochemical properties of Lanthanum-doped Ba0.5Sr0.5Co0.8Fe0.2O3-delta".Journal of Physics and Chemistry of Solids 68.9(2007):1707-1712.