Comparative Study on Performance Stability of Ni–Oxide Cermet Anodes under Humidified Atmospheres in Solid Oxide Fuel Cells
Comparative Study on Performance Stability of Ni–Oxide Cermet Anodes under Humidified Atmospheres in Solid Oxide Fuel Cells
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DOI：
10.1149/2.053208jes
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发表时间：
2013-10
影响因子：
3.9
通讯作者：
T. Matsui;R. Kishida;H. Muroyama;K. Eguchi
中科院分区：
文献类型：
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作者：
T. Matsui;R. Kishida;H. Muroyama;K. Eguchi
在1000 ℃、高湿度的艾德氢（40%H2O-60%H2）条件下，研究了镍氧化物基金属陶瓷阳极中氧化物组分对性能稳定性的影响。应用三种类型的阳极; Ni-氧化钐掺杂的氧化铈（Ni-SDC）、Ni-氧化钇稳定的氧化锆（Ni-YSZ）和Ni-氧化钪稳定的氧化锆（Ni-ScSZ）。对于具有Ni-YSZ和Ni-ScSZ阳极的电池，在恒定电流操作期间确认性能的突然恶化，伴随着阳极和参考电极之间的欧姆电阻的急剧增加。相反，Ni-SD正极材料的性能在48 h内基本稳定，其性能差异与电化学活性中心附近的局部水蒸气分压有关，因为镍颗粒的表面氧化导致了电池性能的劣化。采用聚焦电子束扫描电镜（FIB-SEM）观察了阳极的电化学行为，发现阳极的相界长度、镍颗粒大小等微观结构与阳极电化学行为有很强的相关性。
The influence of the oxide component in Ni–oxide based cermet anodes on the performance stability was examined at 1000 ◦ C with a supply of highly humidified hydrogen, 40% H 2 O–60% H 2 . Three types of anodes were applied; Ni–samaria-doped ceria (Ni–SDC), Ni–yttria-stabilized zirconia (Ni–YSZ), and Ni–scandia-stabilized zirconia (Ni–ScSZ). Abrupt deterioration in performance was confirmed during constant current operation for the cells with Ni–YSZ and Ni–ScSZ anodes, accompanied with a drastic increase in ohmicresistancebetweentheanodeandreferenceelectrode.Incontrast,theperformanceofcellwithNi–SDCanodewasprettystablefor48h.Thesedifferencesinperformancestabilityweresignificantlyrelatedtothelocalpartialpressureofsteaminthevicinityof theelectrochemicallyactivesitesbecausethesurfaceoxidationofnickelparticlesresultedinthedeterioration.ThemicrostructuralchangesinNi–YSZandNi–SDCanodesupondischargewerealsoquantifiedbythedual–beamfocusedionbeam–scanningelectron microscopy(FIB–SEM).Theelectrochemicalbehaviorobservedineachanodehadastrongcorrelationwiththeanodemicrostructuresuchastriplephaseboundarylengthandnickelparticlesize.