3D Electrode Microstructure Reconstruction and Modelling
3D Electrode Microstructure Reconstruction and Modelling
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3D 电极微观结构重建和建模
DOI：
10.1149/1.3205650
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发表时间：
2009
影响因子：
--
通讯作者：
E. Ivers
中科院分区：
文献类型：
--
作者：
B. Rüger;Jochen Joos;A. Weber;T. Carraro;E. Ivers
电极内的极化损耗由材料成分和微观结构决定。电极微观结构的分析和建模有助于理解和改进电极。在这项初步研究中，将说明如何使用双束聚焦离子束/扫描电子显微镜 (FIB/SEM) 重建高性能 LSCF 阴极。将讨论该技术用于微观结构建模的机会以及可能的误差来源。根据获得的重建数据，可以计算表面积、体积/孔隙率或弯曲度等微观结构参数。这些参数可用于通过文献 (1-4) 中的微观结构模型计算阴极性能。然而，为了更准确地研究微观结构和性能的相互作用，需要直接在模型中使用重建的微观结构。提出了三维 (3D) 有限元法 (FEM) 模型 (5)，可用于分析和预测阴极性能。该模型已经过验证，我们将展示如何通过扩展模型以直接使用 3D FIB/SEM 数据来克服有关微观结构的简化。
Polarization losses within the electrodes are determined both by material composition and microstructure. Analyzing and modelling of electrode-microstructure can help to understand and improve electrodes. In this initial study, the use of a dual-beam focused ion beam/scanning electron microscope (FIB/SEM) for the reconstruction of a high performance LSCF-cathode will be illustrated. Opportunities that arise from this technology for microstructure modelling and possible sources of error will be discussed. From the obtained reconstruction data, the calculation of microstructural parameters like surface area, volume/porosity fraction or tortuosity is possible. Such parameters can be used to calculate cathode performance via microstructure models found in literature (1-4). However, it would be desirable to use the reconstructed microstructure directly in a model in order to investigate the interaction of microstructure and performance more accurately. A three-dimensional (3D) finite element method (FEM) model (5) is presented that allows the analysis and prediction of cathode performance. The model has already been validated, and we will show how to overcome simplifications concerning the microstructure by an extension of the model enabling a direct use of 3D FIB/SEM-data.