Degradation of Solid Oxide Fuel Cell Anodes Due to Sintering of Metal Particles Correlated Percolation Model
Degradation of Solid Oxide Fuel Cell Anodes Due to Sintering of Metal Particles Correlated Percolation Model
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DOI：
10.1149/1.1837952
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发表时间：
1997-09
影响因子：
3.9
通讯作者：
A. S. Ioselevich;A. Kornyshev;W. Lehnert
中科院分区：
文献类型：
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作者：
A. S. Ioselevich;A. Kornyshev;W. Lehnert
利用关联渗流模型，模拟了金属颗粒自发烧结引起的化学活性三相界面随时间的变化。根据相对成分、气孔率和烧结条件的不同，得到了不同的变化模式。它们的范围从中度退化(当三相边界仍然穿透整个阳极体积)到灾难性退化(当三相边界局部化在集电器附近的薄层内)。还揭示了更具体的情况，包括非单调变化，以及当烧结导致新气孔打开时三相边界增加的罕见情况。讨论了为获得稳定的阳极性能而进行的成分优化。
Variation with time of the chemically active three-phase boundary, due to the spontaneous sintering of metal particles, is simulated with the help of a correlated percolation model. Different modes of variation are obtained depending on the relative composition and porosity and the conditions of sintering. They range from a moderate degradation (when the three-phase boundary still penetrates through the whole volume of the anode) to a catastrophic degradation (when the three-phase boundary is localized within a thin layer near the current collector). More specific situations, including non-monotonic variation, are also revealed, as well as a rare case where the three-phase boundary increases when the sintering leads to the opening of new pores. Optimization of composition for a stable anode performance is discussed.