About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Ceramics for Clean Hydrogen
|
| Presentation Title |
Temperature Induced Relaxation for Determining Oxygen Transport Properties of Mixed-Conducting Ceramics |
| Author(s) |
Changrong Xia |
| On-Site Speaker (Planned) |
Changrong Xia |
| Abstract Scope |
Oxygen transport properties are critical for mixed ion-electron conducting ceramics which are applied in high-temperature solid oxide electrolysis cells. These properties are widely determined using chemical-relaxation induced by changing oxygen partial pressure through gas switch. This presentation reports the primary efforts on developing chemical relaxation induced by changing temperature, which is named as temperature induced relaxation (TIR). The TIR fundamental is carefully discussed, which shows that the chemical relaxation can be induced by changing temperature at a relatively high rate. The TIR technique is experimentally demonstrated with a home-made system using LSCF as a model material. The chemical surface exchange coefficient and chemical bulk diffusion coefficient can be determined by the TIR method. And coefficients at different temperatures and oxygen partial pressures are determined, showing that TIR is a promise technique to determine the oxygen transport kinetics of nonstoichiometric oxides. |
