@article{QIU2022, 
author = {Peng QIU and Bo LIU and Lei WU and Huiying QI and Baofeng TU and Jian LI and Lichao JIA},
title = {K-doped BaCo0.4Fe0.4Zr0.2O3−δ as a promising cathode material for protonic ceramic fuel cells},
year = {2022},
journal = {Journal of Advanced Ceramics},
volume = {11},
number = {12},
pages = {1988-2000},
keywords = {protonic ceramic fuel cells (PCFCs), proton transport, proton-conducting cathode, triple-conducting, hydration capability},
url = {https://www.sciopen.com/article/10.1007/s40145-022-0662-7},
doi = {10.1007/s40145-022-0662-7},
abstract = {Slow oxygen reduction reaction (ORR) involving proton transport remains the limiting factor for electrochemical performance of proton-conducting cathodes. To further reduce the operating temperature of protonic ceramic fuel cells (PCFCs), developing triple-conducting cathodes with excellent electrochemical performance is required. In this study, K-doped BaCo0.4Fe0.4Zr0.2O3−δ (BCFZ442) series were developed and used as the cathodes of the PCFCs, and their crystal structure, conductivity, hydration capability, and electrochemical performance were characterized in detail. Among them, Ba0.9K0.1Co0.4Fe0.4Zr0.2O3−δ (K10) cathode has the best electrochemical performance, which can be attributed to its high electron (e−)/oxygen ion (O2−)/H+ conductivity and proton uptake capacity. At 750 ℃, the polarization resistance of the K10 cathode is only 0.009 Ω·cm2, the peak power density (PPD) of the single cell with the K10 cathode is close to 1 W·cm−2, and there is no significant degradation within 150 h. Excellent electrochemical performance and durability make K10 a promising cathode material for the PCFCs. This work can provide a guidance for further improving the proton transport capability of the triple-conducting oxides, which is of great significance for developing the PCFC cathodes with excellent electrochemical performance.}
}