Effect of A site deficiency of LSM cathode on the electrochemical performance of SOFCs with stabilized zirconia electrolyte

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• 作者：Gang Chen^a ; ^b ; ^{Chengang@smm.neu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yu Gao^a ; Yifei Luo^a ; Ruifeng Guo^a
• 关键词：Solid oxide fuel cell ; Cathode ; LSM ; Interfacial reaction ; A site deficiency ; Electrochemical performance
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1304-1309
• 全文大小：1792 K

文摘

The effect of A site deficiency on the electrochemical performance of a strontium-doped lanthanum manganite (LSM) cathode in an ScSZ electrolyte-supported solid oxide fuel cell (SOFC) was investigated. XRD characterization resulted in a series of (La_0.75Sr_0.25)_xMnO₃ (x=1.0, 0.97, 0.95, 0.9 and 0.85) powders, indicating that the Mn₃O₄ phase precipitated into (LS)_xM when the deficiency value was over a certain threshold value. The chemical reaction occurred between stoichiometric LSM and ScSZ due to the high chemical potential of La. An A site deficiency in the LSM can reduce the chemical potential of La and suppress the interfacial reaction between the LSM and ScSZ. The precipitation of Mn₃O₄ due to a larger A site deficiency leads to the formation of LZO occurring at the A site-deficient (LS)_xM and ScSZ. An A site-deficient (LS)_xM cathode appears to possess good adhesion with the ScSZ electrolyte and a longer active TPB length after being sintered at 1300 °C. An optimal A site deficiency concentration was considered to exist in the electrochemical performance improvement of the A site-deficient LSM cathode SOFC.