Multiscale microstructural evolutions of nickel-gadolinium doped ceria in solid oxide fuel cell anode
Multiscale microstructural evolutions of nickel-gadolinium doped ceria in solid oxide fuel cell anode
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DOI：
10.1016/j.jpowsour.2020.228710
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发表时间：
2020-12
影响因子：
9.2
通讯作者：
A. Sciazko;Y. Komatsu;Takaaki Shimura;N. Shikazono
中科院分区：
文献类型：
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作者：
A. Sciazko;Y. Komatsu;Takaaki Shimura;N. Shikazono
研究了Ni-GDC复合阳极在800℃、40%H2O:20%H2:40%N2加湿条件下的多尺度微观结构演变。利用空间分辨率为2 nm和25 nm的聚焦离子束扫描电镜（FIB-SEM）观察了局部和整体微观结构的变化。在Ni相和GDC相中观察到明显的多尺度结构重组。证实了GDC纳米颗粒在几微米范围内的迁移。此外，在Ni表面形成纳米厚度的GDC薄层，类似于强金属支撑相互作用（SMSI）。在电极-电解质界面和集流器附近可以看到GDC相的非均匀微观结构演变。GDC的微观结构演变被认为是阳极降解的关键因素。
In the present study, multiscale microstructure evolutions of nickel and gadolinium doped ceria (Ni-GDC) composite anode operated under humidified condition (800 °C, 40%H2O:20%H2:40%N2) are investigated. Focused ion beam - scanning electron microscopy (FIB-SEM) with spatial resolutions of 2 nm and 25 nm are used to observe the changes in both local and whole microstructures. Significant multiscale reorganization of the microstructure is observed in both Ni and GDC phases. Migration of GDC nano-particles in the range of several micrometers is confirmed. In addition, thin GDC layer with nanometer thickness is formed on the Ni surface, similar to the strong metal support interaction (SMSI). Heterogeneous microstructural evolutions of the GDC phase are seen at the electrode-electrolyte interface and at the vicinity of the current collector. The GDC microstructural evolution is considered as a key factor of anode degradation.