Effect of A site deficiency of LSM cathode on the electrochemical performance of SOFCs with stabilized zirconia electrolyte. Issue 1 (January 2017)

• Record Type: Journal Article
• Authors: Chen, Gang; Gao, Yu; Luo, Yifei; Guo, Ruifeng
• Is Part Of: Ceramics international. Volume 43:Issue 1(2017)Part B
• Page Start: 1304
• Page End: 1309
• Publication Date: 2017-01
• Subjects: Solid oxide fuel cell -- Cathode -- LSM -- Interfacial reaction -- A site deficiency -- Electrochemical performance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.10.082
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: 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 (La0.75 Sr0.25 )x MnO3 (x=1.0, 0.97, 0.95, 0.9 and 0.85) powders, indicating that the Mn3 O4 phase precipitated into (LS)x M 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 Mn3 O4 due to a larger A site deficiency leads to the formation of LZO occurring at the A site-deficient (LS)x M and ScSZ. An A site-deficient (LS)x M 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.