高性能H-SOFC质子阻塞复合阴极材料PBSF-SDC

High Performance H-SOFC Proton-blocking Composite Cathode Material PBSF-SDC

采用EDTA-柠檬酸络合法制备了新型的无钴钙钛矿氧化物Pr0.5Ba0.25Sr0.25FeO3-δ(PBSF),XRD分析表明PBSF为立方钙钛矿结构,同时与Ce0.8Sm0.2O1.9(SDC)和BaZr0.1Ce0.7Y0.2O3-δ(BZCY)在1000℃时具有良好的化学相容性。PBSF的热膨胀系数为15.2×10^-6 K^-1,明显低于Co基钙钛矿材料。以PBSF-SDC为阴极、NiO-BZCY为阳极、BZCY为电解质的单电池在750℃时最大功率密度为(865±38)mW/cm^2,极化电阻为0.092Ω·cm^2。结果表明,PBSC-SDC质子阻塞型复合阴极在H-SOFCs中具有潜在的应用前景。

A novel Co-free perovskite oxide powder Pr0.5Ba02.5Sr0.25FeO3-δ(PBSF)was prepared by EDTA-citric acid complexation method.XRD analysis showed that PBSF was cubic perovskite structure.At the same time,a good chemical compatibility was observed among PBSF,Ce0.8Sm0.2O1.9(SDC)and BaZr0.1Ce0.7Y0.2O3-δ(BZCY).The thermal expansion coefficient of PBSF was 15.2×10^-6 K^-1,which was obviously better than that of Co-based perovskite material.The maximum power density and polarization resistance at 750℃of single cell with NiO-BZCY|BZCY|PBSF-SDC configuration were(865±38)mW·cm^-2 and 0.092Ω·cm^2,respectively.The results suggested that the proton-blocking composite cathode PBSF-SDC had a good application prospect in H-SOFCs.