About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Ceramics for Clean Hydrogen
|
| Presentation Title |
Mapping Structure–Property Relationships in Protonic
Ceramic Fuel Cell Cathodes: From Surface Redox Chemistry to Combinatorial
Discovery |
| Author(s) |
Koki Kitabayashi, Miyu Araki, Shusei Nakashima, Kota Tsujikawa, Junji Hyodo, Susumu Fujii, Yoshihiro Yamazaki |
| On-Site Speaker (Planned) |
Koki Kitabayashi |
| Abstract Scope |
Structure-property maps in inorganic solids are essential for materials and device improvement, yet establishing such relationships remains challenging. For protonic ceramic fuel cells (PCFCs) in particular, the factors governing the cathodic oxygen reduction reaction are still poorly understood. To address this, we systematically investigated how composition and structure influence charge carrier states in Sc-substituted PrBaCo2O5+δ. While Sc substitution slightly increases bulk proton concentration, it also raises the surface Co oxidation state, which correlates with degraded cathodic performance of PCFC. These findings indicate that surface redox states govern cathodic activity, and that bulk descriptors alone are insufficient to predict PCFC cathode performance. To explore this multidimensional design space, we developed a combinatorial methodology integrating high-throughput synthesis, automated XRD, compositional analysis, and fuel cell evaluation, enabling direct mapping of electrochemical properties onto composition-structure phase diagrams. This approach accelerates cathode optimization for PCFCs. |
