LaCoO_3-δ (LC)-coated Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF) cathode is fabricated by the solution impregnation method and promoted electrochemical performance is obtained. After being coated by LC shell, the polarization resistance can be as low as 0.197 Ω cm² and the peak power density is 0.243 W cm⁻² at the operating temperature of 600 °C. The excellent CO₂ resistance of LC-coated BSCF cathode is verified by the CO₂-poisoning test. Even in the operating atmosphere with high CO₂ concentration, the polarization resistance change of LC-coated BSCF cathode is much smaller than that of the blank BSCF cathode. By long-term test of single cells, the remarkable electrochemical performance stability of LC-coated BSCF cathode is shown. The promoted electrochemical performance, excellent CO₂ resistance and remarkable long-term stability make LC-coated BSCF cathode promising for intermediate temperature solid oxide fuel cells.

采用溶液浸渍法制备了LaCoO3 _-δ（LC）包覆的Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O3 _-δ（BSCF）阴极，电化学性能得到了提高。在用LC外壳涂覆后，在600°C的工作温度下，极化电阻可以低至0.197Ωcm ²，并且峰值功率密度为0.243 W cm ^-2。LC涂覆的BSCF阴极具有出色的CO ₂耐受性，已通过CO ₂中毒测试得到了证实。即使在高CO ₂的工作环境中浓度下，LC涂覆的BSCF阴极的极化电阻变化远小于空白BSCF阴极的极化电阻变化。通过单电池的长期测试，显示了LC包覆的BSCF阴极的卓越电化学性能稳定性。电化学性能的提升，出色的CO ₂耐受性和出色的长期稳定性使LC涂覆的BSCF阴极有望用于中温固体氧化物燃料电池。