Three kinds of Co-free Ba_0.5Sr_0.5FeO_3-δ (BSF), Pr_0.5Ba_0.5FeO_3-δ (PBF), and Pr_0.5Ba_0.25Sr_0.25FeO_3-δ (PBSF) cathode materials (CMs) with cubic perovskite structure were prepared by combining EDTA-citrate process and solid state reaction. The lattice constant is the largest for BSF, and the smallest for PBSF due to the difference of Ba²⁺, Sr²⁺, and Pr³⁺ ionic radii. A good chemical compatibility was observed among BSF (PBF or PBSF), Sm_0.2Ce_0.8O_2-δ (SDC) and BaZr_0.1Ce_0.7Y_0.2O_3-δ (BZCY) even their mixture was co-fired at 1000 °C for 6 h. For single cells with NiO-BZCY|BZCY|CM-SDC (CM = BSF, PBF, or PBSF) configuration, the best electrochemical performance was obtained for PBSF at 650 °C and higher working temperatures while it was achieved for BSF at 600 °C. Analyses on the electrochemical impedance spectra show that the polarization process of H-SOFCs with PBSF-SDC composite cathode should be mainly controlled by the charge transfer and diffusion of the oxygen ions while that for both BSF-SDC and PBF-SDC might be dominated by proton behavior.

三种无钴Ba _0.5 Sr _0.5 FeO3 _-δ（BSF），Pr _0.5 Ba _0.5 FeO3 _-δ（PBF）和Pr _0.5 Ba _0.25 Sr _0.25 FeO3 _-δ（PBSF）阴极材料（CMs） EDTA柠檬酸盐法与固相反应相结合制备了立方钙钛矿结构。由于Ba 2 ⁺，Sr ²⁺和Pr ³⁺离子半径的不同，晶格常数对于BSF最大，而对于PBSF最小。在BSF（PBF或PBSF），Sm _0.2 Ce _0.8 O之间观察到良好的化学相容性_2-δ（SDC）和BaZr _0.1 Ce _0.7 Y _0.2 O3 _-δ（BZCY）甚至将它们的混合物在1000°C下共烧6小时。对于具有NiO-BZCY | BZCY | CM-SDC（CM = BSF，PBF或PBSF）构型的单电池，PBSF在650°C和更高的工作温度下获得了最佳的电化学性能，而在600°B下则达到了最佳的电化学性能。 C。电化学阻抗谱分析表明，PBSF-SDC复合阴极对H-SOFCs的极化过程应主要由氧离子的电荷转移和扩散控制，而BSF-SDC和PBF-SDC的极化过程可能受氧离子的控制。质子行为。