Development of LSM/YSZ Composite Electrodes for Thin Film Solid Oxide Fuel Cells

作     者：Y. J. Leng S. H. Chan K. A. Khor S. P. Jiang 

作者机构：Fuel Cells Strategie Research Program School of Mechanical and Production Engineering Nanyang Technological University 50 Nanyang Ave. Singapore 639798 Singapore 

出 版 物：《ECS Proceedings Volumes》 

年 卷 期：2003年第2003-07卷第1期

摘      要：The effects of cathodic current passage, (La,Sr)MnO3 (LSM) stoichiometry and the surface treatment of YSZ electrolyte on the performance of LSM/YSZ composite cathode were investigated. The cathodic current passage had an enhancing/activation effect on the composite cathode made of stoichiometric LSM powder (LSM-A) and YSZ powder, while it had little effect on the composite cathode made of A-site sub-stoichiometric LSM powder (LSM-B) and YSZ powder. An A-site deficiency (~0.1) is effective in inhibiting the formation of the resistive layer such as La2Zr2O7/SrZrO3 between LSM and YSZ. Also, surface treatment of YSZ electrolyte had a major effect on the cathode performance. After polishing the YSZ surface, the measured interfacial resistance of LSM-B/YSZ (50:50 wt%) decreased to 0.27 ohm cm2 from 0.50 ohm cm2 on as-sintered YSZ surface at 800°C in air. The results showed that LSM/YSZ composite cathode performance can be significantly improved by using A-site deficient LSM and thorough surface treatment of YSZ electrolyte.