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首页> 外文期刊>International Journal of Electrochemical Science >A Novel Meshing and Calculating Method for Studying the Effect of Irregular Microstructure on the SOFC Composite Electrode Performances
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A Novel Meshing and Calculating Method for Studying the Effect of Irregular Microstructure on the SOFC Composite Electrode Performances

机译：研究不规则微观结构对SOFC复合电极性能影响的一种新的网格计算方法

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摘要

Porous composite electrode is the core component of the solid oxide fuel cell (SOFC) to support the highelectrochemical performance; and there are many strict functional requirements, such as the flowdiffusivity, three phase boundary sites, ionic and electronic conductivities, thermal conductivity and soon. These are generally considered to greatly depend on the detail microstructure morphology of theelectrodes. In the past decades, many theories basing on homogeneous medium hypothesis (i.e.,percolation theory) have been developed to study the dependence of effective electrode properties on themicrostructure parameters. However, these models neglect the influence of the irregular microstructuredetails. Although the numerical simulation approach can directly mesh the complex electrode structureto consider the influence of irregular microstructure details, this conventional method can only deal witha very small calculating zone due to the very large calculation ability requirement. In this paper, a novelapproach that using regular meshes with irregular properties distribution information is firstly proposedto deal with the influence of the irregular microstructure details. Then, the calculated results based onthe proposed method are compared with that obtained by the conventional method to well illustrate thevalidation of this novel approach.
机译：多孔复合电极是支持高电化学性能的固体氧化物燃料电池（SOFC）的核心组件。并且对流动扩散性，三相边界部位，离子和电子电导率，热导率以及很快有很多严格的功能要求。通常认为这些很大程度上取决于电极的详细微观结构形态。在过去的几十年中，已经开发了许多基于均质介质假设的理论（即渗流理论），以研究有效电极性能对微观结构参数的依赖性。但是，这些模型忽略了不规则微观结构细节的影响。尽管数值模拟方法可以直接将复杂的电极结构划分为网格，以考虑不规则的微观结构细节的影响，但是由于计算能力要求非常高，该常规方法只能处理非常小的计算区域。本文提出了一种新颖的方法，该方法使用具有不规则特性分布信息的规则网格来处理不规则微观结构细节的影响。然后，将基于所提出的方法的计算结果与常规方法所获得的结果进行比较，以很好地说明这种新方法的有效性。

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