Investigation and study of three different composite cathodes for proton-conducting solid oxide fuel cells

Traditional composite cathode was usually mixed with cathode materials and BaZr0.1Ce0.7Y0.2O3-delta (BZCY) to obtain thermal and chemical compatibility with proton-conducting electrolyte. Considering the poor chemical stability of BZCY in wet atmosphere, three different composite cathodes of La0.6Sr0.4Co0.2Fe0.8O3+delta (LSCF)-BZCY, LSCF-Sm0.2Ce0.8O2-delta (SCO), LSCF-La2Ce2O7+delta (LCO) were fabricated and systematically researched. Due to the high chemical stability and triple conductivity, the single cell with cathode of LSCF-LCO presented a better cell performance of 1020 mW.cm(-2) at 700 degrees C and long-term operation durability. In addition, the analysis of distribution of relaxation time method (DRT) and impedance spectrum revealed that the migration rates of proton and oxygen ion were enhanced through adjusting electrolyte material, showing great potential for future application of new cathode materials for proton-conducting solid oxide fuel cells (H-SOFCs).