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In operando optical study of active three phase boundary of nickel-yttria stabilized zirconia solid-oxide fuel cell anode under polarization
Journal of Power Sources ( IF 9.2 ) Pub Date : 2018-06-14 , DOI: 10.1016/j.jpowsour.2018.06.001
Zhenjun Jiao , Naoki Shikazono

Degradation of solid oxide fuel cell (SOFC) anode always takes place during long-term high temperature operation because of the decrease in three phase boundary (TPB) density and loss of nickel (Ni) network percolation due to Ni coarsening. In the present study, for the first time, an in operando observation technology using optical laser microscope is developed to demonstrate the real-time local morphological change of Ni at active TPB under polarization conditions. The local morphological change, which is determined by the competition between the mechanisms of enhanced Ni wettability on yttria-stabilized zirconia (YSZ) surface and thin Ni-film break up caused by Ni coarsening are observed. In operando observation reveals the reason of rapid performance degradation of SOFC anode under sever operation conditions. It is expected that the in operando observation of Ni morphological change can largely enrich our understanding of the SOFC anode microstructure change, which may further supply precious opportunities to investigate sever degradation mechanisms.



中文翻译:

极化条件下镍-钇稳定氧化锆固体氧化物燃料电池阳极活性三相边界的操作光学研究

固态氧化物燃料电池(SOFC)阳极的降解总是在长期高温操作期间发生,这是因为三相边界(TPB)密度降低以及由于Ni粗化而导致的镍(Ni)网络渗滤损失。在本研究中,首次开发了使用光学激光显微镜的操作中观察技术,以证明极化条件下活性TPB下Ni的实时局部形态变化。观察到局部形态变化,这是由氧化钇稳定的氧化锆(YSZ)表面上增强的镍润湿性机理与由镍粗化引起的薄镍膜破裂之间的竞争所决定的。操作中观察揭示了在严重操作条件下SOFC阳极性能快速下降的原因。可以预期的是,在运行中观察到Ni形态的变化可以极大地丰富我们对SOFC阳极微观结构变化的理解,这可能会进一步提供宝贵的机会来研究严重的降解机理。

更新日期:2018-06-14
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