Cobalt‐free perovskite oxides with mixed ionic and electronic conducting (MIEC) properties have been considered as promising alternatives for solid oxide fuel cell (SOFC) cathode material. Among the cobalt‐free perovskite oxides, iron‐based perovskite oxides have received much spotlight as potential candidates for high‐temperature SOFC cathode material attributed to their great catalytic activity for the oxygen reduction reaction (ORR) and excellent cell operation durability. Herein, Sr‐doped Pr_0.5Ba_0.4Sr_0.1FeO_3–δ (PBSF) is presented with the aims of enhancing the catalytic activity for ORR while retaining great durability for yttria‐stabilized zirconia (YSZ)‐supported SOFC. The developed PBSF exhibited outstanding cathodic polarization resistance of 0.05 Ω cm² at 850 °C, which is 3 times lower than the commercial La_1–xSr_xMnO_3–δ. Furthermore, there is no observable degradation for 50 hours. This study presents a great potential to replace the commercial cathodes for YSZ‐supported SOFC.

中文翻译：

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无钴Pr0.5Ba0.4Sr0.1FeO3-δ可作为商业YSZ支撑的固体氧化物燃料电池的高效阴极

具有混合离子和电子导电（MIEC）特性的无钴钙钛矿氧化物被认为是固体氧化物燃料电池（SOFC）阴极材料的有前途的替代品。在无钴钙钛矿氧化物中，铁基钙钛矿氧化物作为高温SOFC阴极材料的潜在候选物备受瞩目，这归因于其对氧还原反应（ORR）的强大催化活性和出色的电池使用寿命。此处，Sr掺杂的Pr _0.5 Ba _0.4 Sr _0.1 FeO _{3– δ}提出（PBSF）的目的是增强ORR的催化活性，同时保留由氧化钇稳定的氧化锆（YSZ）负载的SOFC的出色耐久性。发达PBSF表现出0.05Ω厘米优秀阴极极化电阻²在850℃，这是比低3倍的市售的La _1-x的Sr _X MnO的_{3- δ}。此外，在50小时内没有观察到降解。这项研究显示了替代YSZ支撑SOFC的商业阴极的巨大潜力。