| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Materials for Energy Conversion and Storage 2025
|
| Presentation Title |
Onto the process of scandium doped zirconia phase decomposition during solid oxide fuel cell operation |
| Author(s) |
Julian Escobar, Matthew Olszta, Danny Edwards, Elango Elangovan , Tyler Hafen, Jenna Pike, Mark Bowden, Olga Marina |
| On-Site Speaker (Planned) |
Julian Escobar |
| Abstract Scope |
Solid electrolytes are oxygen-ion conductive oxides fundamental to the operation of solid oxide fuel cells (SOFC). The chemical composition of electrolytes has been a topic of research for decades, aiming to achieve a highly stable cubic crystal structure at operational conditions. Scandia stabilized zirconia (ScSZ) is currently a substitute to yttria stabilized zirconia due to its high ionic conductivity around 800°C. It is generally accepted that 6-10 mol.% ScSZ will exhibit a cubic structure. However, a cubic to rhombohedral decomposition has been reported when annealed at 800°C, i.e., intermediate temperature SOFC operation. We demonstrated a unique process of ScSZ decomposition driven by Sc dissolution in a commercial stack using high-resolution transmission electron microscopy. Isolated regions of Sc depleted ScSZ exhibit feather-like, and herring bone microstructure associated to early and late stages of degradation. Cubic (ScSZ) to monoclinic (Sc-depleted zirconia) transformation was exacerbated after testing on the fuel side electrode. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Energy Conversion and Storage, Phase Transformations |