Towards high performance durable ceramic fuel cells using a triple conducting perovskite cathode
To guarantee the efficient and durable operation of oxygen ion/proton-conducting ceramic fuel cells , the cathode materials need to be versatile in terms of high activity, good CO 2 resistance, and matched thermal expansion behavior with electrolyte, etc. In this study, we substituted 10% Nb to the B-site of parent perovskite-BaCo 0.7 Fe 0.2 Y 0.1 O 3-δ , to form a single-phase material with triple conducting (H + /O 2- /e - ) capability as a highly ORR-active cathode. The doped BaCo 0.6 Fe 0.2 Y 0.1 Nb 0.1 O 3-δ (BCFYN) shows promising ORR activity due to the optimized oxygen vacancy , improved hydration capacity, and accelerated charge transfer kinetics. The reduction of thermal expansion coefficient (TEC) and enhanced CO 2 resistance also facilitate the cathode durability. As a result, the area-specific resistances of BCFYN electrode at 550 °C for oxygen-ion and proton conducting symmetrical cells were only 0.106 and 0.24 Ω cm 2 , respectively. These results indicate that BCFYN is a highly promising cathode material for both SOFCs and PCFCs.
危险品化学品经营许可证（带存储）