La_0.6Sr_0.4Co_0.2Fe_0.8O₃ (LSCF) is a promising cathode for intermediate temperature range, however strontium tends to segregate on the surface of the cathode and reacts with CO₂ from atmosphere and Cr from interconnect, which deteriorates its oxygen reduction reaction (ORR) activity. Here, we propose infiltrating stable and active A-site deficient Fe-doped lanthanum nickelate perovskite La_1-xNi_yFe_1-yO₃ without Sr element over the LSCF by delicately tailoring the infiltrating amount. It is found that 150 μL La_0.94Ni_0.6Fe_0.4O₃(LNF94) infiltrated LSCF (LNF94@LSCF) composite cathode with improved ORR catalytic activity, its polarization resistance is 0.041 Ω·cm² and peak power densities of 1.08 W cm^-2 is obtained from the single cell with LNF94@LSCF composite cathode at 800 °C. The heterogeneous interface significantly improved the electron conduction and enhanced the dissociation of oxygen molecules which has been verified by the energy band alignment of LSCF and LNF94. Moreover, the core-shell LNF94@LSCF composite cathode showed excellent long-term tolerance to CO₂ and Cr atmosphere.

La _0.6 Sr _0.4 Co _0.2 Fe _0.8 O ₃ (LSCF) 在中温范围内是一种很有前景的阴极，但是锶倾向于在阴极表面偏析并与大气中的CO ₂和互连中的 Cr反应，这会降低其氧还原性反应 (ORR) 活性。在这里，我们建议通过精心调整渗透量，在 LSCF 上渗透稳定且活性 A 位缺陷的 Fe 掺杂镍酸镧钙钛矿 La _1-x Ni _y Fe _1-y O _{3 ，}而不含 Sr 元素。发现 150 μL La _0.94 Ni _0.6 Fe_0.4 O ₃ (LNF94)渗透LSCF (LNF94@LSCF)复合阴极具有改进的ORR催化活性，其极化电阻为0.041 Ω·cm ²，从具有LNF94@LSCF的单电池获得1.08 W cm ^{- 2的}峰值功率密度复合阴极在 800 °C。非均质界面显着改善了电子传导并增强了氧分子的解离，这已通过 LSCF 和 LNF94 的能带排列得到证实。此外，核壳LNF94@LSCF复合正极对CO ₂和Cr气氛表现出优异的长期耐受性。