Influence of A-Site Variation and B-Site Substitution on the Physical Properties of (La,Sr)FeO3 Based Perovskites

✍ Scribed by U. F. Vogt; P. Holtappels; J. Sfeir; J. Richter; S. Duval; D. Wiedenmann; A. Züttel

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 482 KB
• Volume: 9
• Category: Article
• ISSN: 1615-6846
• DOI: 10.1002/fuce.200800116

✦ Synopsis

Perovskite-based materials are used for high temperature electrochemical devices such as solid oxide fuel cells (SOFC), solid oxide electrolyser cells (SOEC) or oxygen separation membranes. The perovskite-type structure ABO 3 can tolerate extensive modifications regarding its composition and can thus be tailored to obtain desired chemical and physical properties. The A-and/or B-site cations can partly be replaced in order to improve properties such as the electrical conductivity, catalytic activity, electrode-electrolyte compatibility or thermal-and mechanical stability. In this work, important pa-rameters for the utilised synthesis method and several stoichiometry variations have been investigated.

A-and B-site substituted lanthanum strontium manganite (LSM), lanthanum strontium ferrite (LSF) or lanthanum strontium cobalt ferrites (LSCF) are widely used and investigated for electrochemical applications in SOFCs and SOECs as well as for oxygen separation membranes and sensors [1][2][3][4]. Till date, LSM has been mainly used as cathode material for high-temperature SOFCs. Lanthanum strontium ferrite