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Meeting Materials Science & Technology 2019
Symposium Global Young Investigators Forum
Presentation Title Quantifying the Nature and Impact of Multi-scale Microstructure Heterogeneities in SOFC Electrodes
Author(s) Rubayyat Mahbub, William K Epting , Tim Hsu, Gregory A Hackett, Harry Abernathy , Shawn Litster, Anthony D Rollett, Paul A Salvador
On-Site Speaker (Planned) William K Epting
Abstract Scope Three-dimensional distributions of microstructural features in solid oxide fuel cell (SOFC) electrodes directly influence their performance. Heterogeneities are expected over several length scales in such complex electrode microstructures due to particle size and volume fraction distributions of their three distinct phases, which are a function of feedstock materials and processing methods. After reconstructing commercially available SOFC electrodes using Xe-PFIB-SEM, which allows for 3D reconstruction of much larger volumes (10-100x) than was previously possible, it is found that microstructural variations exist from the nano-scale to the millimeter scale in typical electrodes. The impact of heterogeneities on the variation in local property values generated using an effective medium theory model is discussed. Moreover, combining PFIB-SEM experimental microstructures with a large number of synthetic ones, a semi-empirical model is presented that can quantitatively rationalize the origin of these multi-scale heterogeneities. Such analysis can facilitate the fabrication of more reliable and durable cells.
Proceedings Inclusion? Definite: At-meeting proceedings

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