Degradation suffering from ambient water vapor in air is harmful for cathodes of solid oxide fuel cells (SOFCs), it is necessary and important to research its attenuation mechanism and related preventive methods. Here, effects of humidity on SrTi_0.05Co_0.95O_3-δ (STC) cathode have been discussed in detailed. X-ray diffraction analysis reveals that STC is relatively stable in wet air with a little crystal contraction, but without obvious impurities. Because active sites of STC for oxygen reduction reaction (ORR) are covered by water vapor, the electrical conductivity decreases while the polarization resistance (R_p) increases with the increasing of the water vapor concentration in air. Compared with R_p measured in dry air, the enhanced R_p value is 0.0347 Ω cm² and 0.0493 Ω cm² in containing 3% and 5% H₂O air after a continuous testing for 96 h at 800 °C, respectively. Furthermore, a maxium power densities of 832 mW cm⁻² and 814 mW cm⁻² can be obtained for STC/LSGM/STC in dry air and containing 5% H₂O air after 96 h operating at 800 °C, respecctively. Interestingly, the degradation coming from humidity can be recovered partially by switching the feedgas back to dry air again. The R_p of STC becomes ~0.0402 Ω cm² again after switching the operating atmosphere from 5% H₂O air to dry air for 5 h.

空气中水蒸气的降解对固体氧化物燃料电池（SOFC）的阴极有害，因此研究其衰减机理和相关的预防方法是必要且重要的。在此，已经详细讨论了湿度对SrTi _0.05 Co _0.95 O3 _-δ（STC）阴极的影响。X射线衍射分析表明，STC在湿空气中相对稳定，晶体收缩很小，但没有明显的杂质。由于用于氧还原反应（ORR）的STC的活性位点被水蒸气覆盖，因此电导率降低，而极化电阻（R _p）随着空气中水蒸气浓度的增加而增加。与R相比_p在干燥空气中测量时，所述增强- [R _p值为0.0347Ω厘米²和0.0493Ω厘米² H中含有3％和5％ ₂在800℃的连续测试96小时后，分别ö空气。此外，对于STC / LSGM / STC，在800°C下运行96 h后，在干燥空气中并含有5％H ₂ O的空气中，分别可获得832 mW cm ^-2和814 mW cm ^-2的最大功率密度。有趣的是，通过再次将原料气切换回干燥空气，可以部分回收来自湿度的降解。从5％H转换工作气氛后，STC的R _p再次变为〜0.0402Ωcm ²₂ O空气干燥空气5小时。