3D finite element model for reconstructed mixed-conducting cathodes: I. Performance quantification
3D finite element model for reconstructed mixed-conducting cathodes: I. Performance quantification
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DOI：
10.1016/j.electacta.2012.04.109
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发表时间：
2012-08-30
影响因子：
6.6
通讯作者：
Ivers-Tiffee, Ellen
中科院分区：
文献类型：
--
作者：
Carraro, Thomas;Joos, Jochen;Ivers-Tiffee, Ellen
电极极化损耗是影响固体氧化物燃料电池（SOFC）性能的重要因素，它与多孔材料的组成和微观结构有关。一个模型，可以解耦的影响，与几何排列，形状和尺寸的颗粒一起材料分布在一侧和材料的属性上的其他可以给一个相关的改进，在理解的基础过程。采用聚焦离子束-扫描电镜（FIB/SEM）层析成像技术对多孔混合离子电子导电（MIEC）阴极进行了重构。在此，微结构的详细几何形状用于电极中电化学过程的3D计算。此外，重构的多孔阴极的面积比电阻（ASR（cat））被计算为性能指标。为了这个目的，我们已经开发了一个模型的基础上的有限元法（FEM），数值解需要使用高性能计算技术（HPC），因为详细的几何形状。在这项工作中，我们显示了一个良好的建立1D平均模型的3D微观结构模型的比较。(C)2012爱思唯尔有限公司保留所有权利。
The performance of a solid oxide fuel cell (SOFC) is strongly affected by electrode polarization losses, which are related to the composition and the microstructure of the porous materials. A model that can decouple the effects associated to the geometrical arrangement, shape and size of the particles together with material distribution on one side and the material properties on the other can give a relevant improvement in the understanding of the underlying processes. A porous mixed ionic-electronic conducting (MIEC) cathode was reconstructed by a tomography technique based on focused ion beam coupled with scanning electronic microscope (FIB/SEM). The detailed geometry of the microstructure is here used for 3D calculations of the electrochemical processes in the electrode. In addition, the area specific resistance (ASR(cat)) of the reconstructed porous cathode is calculated as a performance index. To this aim we have developed a model based on the finite element method (FEM), which numerical solution requires the use of high performance computing techniques (HPC) because of the detailed geometry. In this work we show the comparison of the 3D microstructure model with a well established 1D averaged model. (C) 2012 Elsevier Ltd. All rights reserved.