燃料电池中烧结颗粒复合材料三重三相界面的理论设计
Theory-based design of sintered granular composites triples three-phase boundary in fuel cells
摘要：
固体氧化物燃料电池从由自发电化学反应释放的能量产生电流。这些器件的效率关键取决于其电极的微观结构，特别是三相边界（TPB）长度，能量产生反应沿着该长度发生。我们提出了一个系统的最大化的TPB长度作为一个功能的四个容易控制的微观结构参数，对于任何给定的平均水力半径，这是一个传统的措施，气体流动的渗透性。我们确定的最大化参数，并表明，城规会的长度可以增加超过300%的因素相比，目前的常见做法。我们通过计算几个数值模拟结构的TPB来支持这一结果。我们还比较了四个模型的烧结电极中的一个单一的晶间接触，并表明，在文献中常用的模型是过于简化和非物理的。然后，我们提出了两个替代方案。
英文摘要：
Solid-oxide fuel cells produce electric current from energy released by a spontaneous electrochemical reaction. The efficiency of these devices depends crucially on the microstructure of their electrodes and, in particular, on the three-phase boundary (TPB) length, along which the energy-producing reaction occurs. We present a systematic maximisation of the TPB length as a function of four readily-controllable microstructural parameters, for any given mean hydraulic radius, which is a conventional measure of the permeability to gas flow. We identify the maximising parameters and show that the TPB length can be increased by a factor of over 300% compared to current common practices. We support this result by calculating the TPB of several numerically simulated structures. We also compare four models for a single intergranular contact in the sintered electrode and show that the model commonly used in the literature is oversimplified and unphysical. We then propose two alternatives.
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