无空气吹扫环境下固体氧化物电解堆CO2电解的衰减机理OA

The performance and degradation mechanisms of a solid oxide electrolysis stack were investigated during CO2 electrolysis without air.The real-time voltage variations of individual repeat units were monitored through voltage leads inside the stack.The results demonstrate that after 1 000 h operation,the voltage of overall stack decreases by 1.77%,and two repeat units decreases by 1.98%and 1.76%,respectively.The microstructural analysis reveals that the formation of a new barrier layer SrCrO4,at the interface between metallic interconnects and cell current collectors in the repeat units,resulting in an increase of interfacial contact resistance.Additionally,microcracks appear at the grain boundaries of electrolyte in the electrolysis cell,which is another major reason to the degradation of the electrolysis cell.However,due to the reliability of the flat-tube electrolysis cell structure,the overall performance of the electrolysis stack remains relatively stable even in the absence of air blowing,providing a reference for its application in specialized environments.