本文使用平管型SOEC电解堆，探究了空气极无吹扫气环境下CO₂/H₂O共电解的瞬态性能和稳定性。结果表明，电解堆空气极在有、无吹扫气时的瞬时电解性能几乎一致。在750 ℃恒温、空气极无空气吹扫、0.67 A·cm^-2电流密度下共电解超过200 h，电解堆电压下降速率约为0.203%/100 h。微观结构结果显示，电解堆中电解池的Ni颗粒损失明显，空气极集流层表面形成了绝缘相SrCrO₄，上述共同因素是导致电解池性能衰减的主要原因。本文研究为SOEC电解堆在无空气环境下的高能效电解合成燃料应用提供了参考。

This work investigates the transient performance and stability of CO₂/H₂O co-electrolysis in an air-free environment using a flat-tube solid oxide electrolysis cell (SOEC) stack. The results showed that the transient behavior of the stack with and without blowing gas into the air electrode is almost the same. With a current density of 0.67A·cm^-2 @750 °C, the stack operated for over 200 h under co-electrolysis conditions without air blowing, and the voltage drop rate of the stack was approximately 0.203%/100 hours. Microstructure analyses revealed a significant loss of nickel particles and an apparent formation of an insulating phase strontium chromate (SrCrO₄) on the surface of the current collection layer of the air electrode, which are identified as key factors contributing to the performance degradation of the stack. This study provides a reference for development of efficient fuel preparation technology based on SOEC stack in airless environments.