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.

引用

页码：1480 / 1483

页数：4