About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Ceramics for Clean Hydrogen
|
| Presentation Title |
Coupled Effects of Local Conduction (O²⁻/n/p) on Oxygen Partial Pressure Profiles and Delamination in SOECs |
| Author(s) |
Taehun Kim, Minuk Kim, Hyung-Tae Lim |
| On-Site Speaker (Planned) |
Taehun Kim |
| Abstract Scope |
Solid oxide electrolysis cells (SOECs) are susceptible to air electrode degradation and interfacial delamination under high-temperature operation, both of which are closely associated with elevated oxygen partial pressure within the electrolyte. This internal oxygen partial pressure arises from the oxygen chemical potential gradient established by mixed ionic–electronic conduction. While electronic conductivity influences this pressure, its effect depends not only on its magnitude but also on the dominant conduction polarity. In YSZ, an n–p transition occurs with increasing oxygen partial pressure, meaning that higher electronic conductivity does not necessarily reduce internal oxygen partial pressure. In CYSZ, enhanced electron concentration under low oxygen partial pressure strengthens n-type conduction and tends to lower the interfacial oxygen partial pressure. In contrast, Pr-doped ceria promotes hole-dominated conduction under high oxygen partial pressure, thereby increasing the interfacial oxygen partial pressure. |
