|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||High-Temperature Systems for Energy Conversion and Storage
||Three-Dimensional Reconstruction of Solid Oxide Fuel Cell Electrodes
||Mark R. De Guire, Harshil Parikh, Naima Hilli, Arthur H. Heuer
|On-Site Speaker (Planned)
||Mark R. De Guire
Electrodes of solid oxide fuel cells (SOFCs) typically have complex, multi-phase microstructures. The three-dimensional distribution of the key phases (ionic conductor, electronic conductor, porosity) determines critical parameters such as triple-phase boundary (TPB) density and therefore can be expected to have profound effects on the performance of these energy-conversion devices.
This talk focuses on three-dimensional characterization of SOFC anodes and cathodes via reconstruction of sequential focused ion beam (FIB) “slice and view” cross-sections. Techniques in sample preparation and data analysis will be discussed that address the challenges posed by porous, multi-phase microstructures in general and SOFC electrodes in particular. For example, gradients in phase distribution call for special consideration of what constitutes a representative sample volume. The important distinction between active and inactive TPBs can be made through custom algorithms. Lastly, examples of microstructural evolution in SOFC electrodes after extended testing and effects on cell performance will be presented.
||Planned: A print-only volume