Abstract
In order to reduce the cathode losses, some studies were carried out on optimizing the LSM-based cathode microstructure. Firstly, the current collecting coatings were prepared with LSM sintered at different temperatures. The sample sintered at 1150 {degree sign}C exhibited the best performance in terms of microstructure and the electrical conductivity. Secondly, composite cathode materials with different LSM contents were prepared. When LSM three-dimensional network was formed, the conduction of the composite cathode was dominated by LSM phase, resulted in higher conductivity and lower activation energy. When the YSZ network formed, the composite exhibited a lower polarization resistance. Electrochemical Impedance Spectroscopy implied that at the temperature of 750 {degree sign}C the composite cathode with 50 wt.% LSM displayed the lowest Rp value of 0.26 Ω cm2.
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