The effect of molybdenum on chromium deposition at (La0.8Sr0.2)0.95MnO3-δ cathode of solid oxide fuel cells
The effect of molybdenum on chromium deposition at (La0.8Sr0.2)0.95MnO3-δ cathode of solid oxide fuel cells
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DOI：
10.1016/j.ijhydene.2016.04.026
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发表时间：
2016-06
影响因子：
7.2
通讯作者：
C. Xiong;Wenlu Li;Nanqi Duan;J. Pu;B. Chi;L. Jian
中科院分区：
文献类型：
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作者：
C. Xiong;Wenlu Li;Nanqi Duan;J. Pu;B. Chi;L. Jian
通过电化学阻抗谱和微观结构分析，研究了Fe单键Cr单键Mn基合金中添加钼在800℃下对LSM阴极铬沉积和中毒的影响。与Fe单键Cr单键Mn合金相比，Fe单键Cr单键Mn单键Mo铁氧体不锈钢金属互连件在LSM阴极上显示出少得多的Cr沉积和中毒。合金中添加Mo抑制了互连线中Cr的蒸发，减少了Cr引起的阴极性能下降。根据SEM结果，在沉积区观察到MoO3和MnMoO4。 LSM阴极中偏析的MnO可以作为成核剂，与汽化的Mo反应形成含Mo的氧化物颗粒，不会抑制三相边界（TPB）中的氧还原反应。因此，在互连合金中适当添加Mo可以有效缓解LSM阴极的Cr中毒。
The effect of addition of molybdenum in Fesingle bondCrsingle bondMn based alloy on the chromium deposition and poisoning of LSM cathodes is investigated at 800 °C by electrochemical impedance spectroscopy and microstructure analysis. The Fesingle bondCrsingle bondMnsingle bondMo ferrite stainless steel metallic interconnect shows much less Cr deposition and poisoning on the LSM cathodes as compared with the Fesingle bondCrsingle bondMn alloy. The addition of Mo into the alloy suppressed Cr evaporation from interconnects, decreased the degradation of cathode performance caused by Cr. According to SEM results, MoO3and MnMoO4is observed at the depositional area. The segregated MnO from LSM cathode can act as a nuclei agent, and react with vaporized Mo to form Mo-contained oxide particles, which will not inhibit the oxygen reduction reactions in the three phase boundary (TPB). As a result, suitable addition of Mo into the interconnect alloy can effectively alleviate the Cr poisoning of the LSM cathode.