固体氧化物燃料电池（SOFC）在长期高温运行中，氧化物阴极材料在含微量SO2的空气中产生硫中毒，引起电池性能衰减，导致电池使用寿命缩短。本课题以商用的Sr和Co掺杂的LaFeO3基阴极材料（LSCF）为研究对象，提出引入缺陷结构和改变组分来调节LSCF阴极材料中Sr的活性，从而抑制阴极材料的硫中毒问题。通过半电池测试法来模拟SOFC实际运行状态，同时结合加速性能衰减法来对材料的耐硫性进行研究，阐明缺陷浓度和组分变化对LSCF阴极材料耐硫性的影响机制，明确LSCF阴极材料的耐硫性和电学性能最优化组分，探讨缺陷型LSCF作为高耐硫性阴极材料的可行性，开发高性能且高耐硫性的阴极材料。此外，探讨电流改变的条件下，LSCF阴极材料的硫中毒反应过程，明确电流存在及变化对材料硫中毒的影响，结合热力学计算结果，阐明SOFC运行过程中阴极材料硫中毒的反应机制，为SOFC阴极硫中毒问题的解决提供重要的信息。

For solid oxide fuel cell (SOFC)，the small amount of sulfur dioxide in air can degrade the cell/stack performance, shortening then the cell/stack lifetime. In this work, we have investigated sulfur poisoning of Sr and Co doped LaFeO3 based oxide (LSCF), which is commercial cathode material. It is expected that Sr activity in LSCF is influenced by introducing defect structure and composition change, thereafter suppress the sulfur poisoning behavior. The effect of defect concentration and composition change on the sulfur poisoning mechanism of LSCF is investigated using half-cell measurement to simulate the SOFC operation condition. Here，the SO2-air mixture with a little higher SO2 concentration than that in air is used to accelerate performance degradation, thus shorten the experimental period. Combined with thermodynamic calculation results, it is hope to achieve the cathode material with high performance and good sulfur tolerance. In additional, in order to clarify sulfur poisoning mechanism of cathode material under SOFC operation condition, the effect of current density on the sulfur poisoning behavior of LSCF is investigated using half-cell method. Our results will supply important information to resolve the sulfur poisoning of cathode material.