Exploring advanced electrode materials with high electrochemical performance and sufficient durability is crucial to the commercialization of solid oxide fuel cells (SOFCs). Herein, a Ruddlesden-Popper Sr_2·9La_0·1Fe_1·9Ni_0·1O_7−δ (SLFN) oxide is systematically evaluated as efficient oxygen electrode material. La and Ni co-doping strategy demonstrates improved oxygen desorption ability and promoted electrochemical activity of pristine Sr₃Fe₂O_7−δ (SF) toward oxygen reduction react (ORR). Further, the ORR process of the SLFN electrode is probed by electrochemical impedance spectroscopy (EIS) and distribution of relaxation time (DRT) technique. The button cell with the SLFN cathode delivers a peak power density of 1.01 W cm⁻² at 700 °C, along with desirable stability over a period of 60 h. This study offers a feasible strategy for developing Ruddlesden-Popper type cathode candidates for SOFCs.

探索具有高电化学性能和足够耐久性的先进电极材料对于固体氧化物燃料电池（SOFC）的商业化至关重要。在此，Ruddlesden-Popper Sr _2·9 La _0·1 Fe _1·9 Ni _0·1 O _{7- δ} (SLFN)氧化物被系统地评估为有效的氧电极材料。La 和 Ni 共掺杂策略证明了改善氧解吸能力并促进原始 Sr ₃ Fe ₂ O _{7- δ的电化学活性}(SF) 对氧还原反应 (ORR)。此外，通过电化学阻抗谱（EIS）和弛豫时间分布（DRT）技术探测了SLFN电极的ORR过程。具有 SLFN 阴极的纽扣电池在 700 °C 下提供 1.01 W cm ^-2的峰值功率密度 ，并在 60 小时内具有理想的稳定性。本研究为开发用于 SOFC 的 Ruddlesden-Popper 型阴极候选物提供了可行的策略。