X-ray photoelectron spectroscopy of La0.5Sr0.5MnO3

被引：64
作者：
Wu, QH
Liu, ML
Jaegermann, W
机构：
[1] Georgia Inst Technol, Sch Mat Sci & Engn, Ctr Innovat Fuel Cell & Battery Technol, Atlanta, GA 30332 USA
[2] Tech Univ Darmstadt, Dept Mat Sci, Surface Sci Inst, D-64283 Darmstadt, Germany
来源：
MATERIALS LETTERS | 2005年 / 59卷 / 12期
关键词：
strontium-doped lanthanum managanite (LSM); X-ray photoelectron spectroscopy; SOFC; cathode materials;
D O I：
10.1016/j.matlet.2004.12.036
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Cathode electrode for solid oxide fuel cells (SOFC) consisting of strontium-doped lanthanum manganite (La0.5Sr0.5MnO3: LSM) was prepared with a modified sol-gel process. Its surface chemical composition was studied by X-ray photoelectron spectroscopy (XPS). As prepared LSM, the oxidation state of Mn ions is +3.5, which is consistent with oxidation state calculated from the chemical formula. The ratio of La, Sr and Mn ions is about 1/1.1/2. After the sample was heated in ultrahigh vacuum (UHV) chamber with oxygen partial pressure of 10(-6) mbar at 600 degrees C for about 3 h, the oxidation state of Mn ions decreases from +3.5 to +3.3 probably due to the generation of oxygen vacancy on the surface. A little Sr rich phase was formed on the surface duo to the formation of SrO. (c) 2005 Elsevier B.V. All rights reserved.
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页码：1480 / 1483
页数：4
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