SOFC多层复合阴极的制备及性能

Preparation and Performance of SOFC Multi-layer Composite Cathodes

为了提高固体氧化物燃料电池阴极的电化学性能和热循环性能,避免La0.7Sr0.3MnO3-σ(LSM)在制备及工作温度下与氧化钇稳定的氧化锆(YSZ)电解质发生反应,增大电化学反应电阻,降低SOFC的性能,采用喷涂法在YSZ电解质片的表面制备了LSM-YSZ的多层复合阴极。从电解质表面开始,各层LSM所占比例依次为40%、70%和100%(质量分数)。结果表明:复合阴极材料的热膨胀系数随着LSM含量的增加而增大,仍与YSZ电解质的热膨胀系数比较接近。阴极极化曲线的测量结果表明,多层复合阴极LSM-YSZ与单层LSM阴极比较,具有更好的电化学性能和更加稳定的热循环性能。

A multi-layer composite cathode of LSM-YSZ was prepared on YSZ electrolyte disk by employing spray method,in order to improve the electrochemical and thermal cycle performance of the cathodes of solid oxide fuel cell(SOFC),avoid the reaction between La0.7Sr0.3MnO3-σ(LSM) and Yttria Stabilized Zirconia(YSZ) under of preparation and operation temperatures which may result in the forming of insulating phases and the degradation of the SOFC.From the electrolyte surface,the ratios of the LSM in the three layers are 40%,70% and 100%,respectively.The thermal expansion coefficient of each layer increases with LSM content and approximately equal to that of YSZ electrolyte.The measurements results of polarization curves show that the multi-layer composite cathodes have better electrochemical performance and thermal-cycle stability compared with LSM cathodes.