About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Ceramics for Clean Hydrogen
|
| Presentation Title |
Elucidating Transient Hydration Kinetics in BaZr0.1Ce0.7Y0.2O3-δ (BZCY172) Electrolytes Via In-Situ Spectroscopy |
| Author(s) |
Zilong Zhuang, Luca Mastropasqua |
| On-Site Speaker (Planned) |
Zilong Zhuang |
| Abstract Scope |
Protonic ceramic electrolysis cell (PCEC) is a promising technology to efficiently produce pure renewable hydrogen at temperatures between 400-600°C. The transient hydration/dehydration reaction kinetics of a Ce-rich BaZr0.1Ce0.7Y0.2O3-δ (BZCY172) electrolyte are monitored via in-situ electrochemical impedance spectroscopy (EIS) to demonstrate the relationship between bulk and grain boundary resistance in response to dynamic gas composition. We show that bulk resistance decreases during hydration until a plateau is reached, indicating oxygen vacancy saturation; further hydration induces an increase of the bulk resistance, suggesting the competing role of p-type and n-type conductivity for oxidizing and reducing conditions, especially in Ce-rich electrolytes. During dehydration, the bulk resistance recovered to baseline levels, demonstrating a reversible reaction mechanism. The effect of p_(H_2 O),p_(O_2 ), and applied potential is studied using pulsed electrical conductivity relaxation (ECR) on each independent parameter. This work adds new fundamental insight into the transient response of protonic ceramic hydration/dehydration reaction kinetics. |
