About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Ceramics for Clean Hydrogen
|
| Presentation Title |
Inter- & Intra-Granular Nanostructure Degradation of YSZ in Electrolyte Under SOEC Operation |
| Author(s) |
Yun Chen, Harry Abernathy, Yueying Fan, Jian Liu, Yinkai Lei, Xueyan Song |
| On-Site Speaker (Planned) |
Xueyan Song |
| Abstract Scope |
A previous NETL study on SOFC degradation presented the first experimental observation of the existence of a space charge layer and its evolution at YSZ/YSZ grain boundaries (GBs) in the Ni/YSZ anode. The humidity in the fuel plays a critical role in driving the formation of the core-shell structure. In SOEC mode, the presence of reactant H2O on the fuel side could also lead to the formation of inter- and intra-granular defects in electrolyte materials. Our preliminary results show that similar defects propagate and develop in YSZ electrolytes when the cells are operated in SOEC mode. In this study, the Ni/YSZ anode support cells operated in SOEC mode were exanimated. This study presents the experimental evidence of the co-existence of inter- and intra-granular defects in YSZ electrolytes. Those defects, especially the intragranular ones, could lead to catastrophic cracking of the electrolyte and/or delamination of the electrode once they coalesce. |