Enhancing performance of proton ceramic fuel cells through fluorine‐doped perovskite oxides

Abstract Proton ceramic fuel cell efficiently converts chemical energy into electrical energy, representing a pivotal component of future energy systems. However, its current performance is hindered by limitations in cathode and electrolyte materials, thereby impeding commercialization. Anion doping emerges as a promising strategy to enhance the electrochemical efficiency of perovskite‐based cathodes and electrolytes. However, integrating this approach within a single‐cell structure still requires further research. In this study, F‐doped perovskite oxides BaCo 0.4 Fe 0.4 Zr 0.1 Y 0.1 O 2.9‐ δ F 0.1 (BCFZYF) and BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 2.9‐ δ F 0.1 (BZCYYbF) were synthesized for use as the cathode and electrolyte, respectively, in proton ceramic fuel cells. Our findings demonstrate that F‐doped perovskite oxides exhibit superior electrochemical performance and enhanced structural stability. Furthermore, doping both electrodes and electrolytes with F ions improves their interfacial compatibility. The cell configuration BCFZYF | BZCYYbF | Ni‐BZCYYbF achieved a peak power density of 998 mW·cm −2 at 650 °C using H 2 as fuel, and it maintained stable operation for over 400 h at 550 °C with a current density of 400 mA·cm −2 . This research underscores an effective strategy for enhancing the performance and durability of proton ceramic fuel cells.