Improving the activity of a cathode material towards the oxygen reduction reaction (ORR) and its tolerance against CO₂ impurities is of prime importance to realizing the application of solid oxide fuel cells that operate under intermediate temperatures (IT-SOFCs). Here, by adopting an A- and B-site co-doping strategy, we report a new perovskite-type oxide, Nd_0.2Sr_0.8Nb_0.1Co_0.9O_3-δ (N0.2SNC), as an active and CO₂-tolerant cathode material for IT-SOFCs. Compared with single-site doped Nd_0.2Sr_0.8CoO_3-δ (N0.2SC, A-site doping) and SrNb_0.1Co_0.9O_3-δ (SNC, B-site doping) and the parent oxide SrCoO_3-δ (SC), N0.2SNC shows improved electrocatalytic activity for the ORR and superior resistance towards CO₂ poisoning, achieving a low area specific resistance (ASR) of 0.037 Ω cm² at 650 °C. In addition, the ASR value of the N0.2SNC electrode only increases from 0.08 to 0.20 Ω cm² after operating for 300 min under an air atmosphere with 5% CO₂. A- and B-site cation synergy is obtained through co-doping, leading to the improved performance. A peak power density of 1563 mW cm⁻² is achieved at 650 °C. This A- and B-site cation synergy may offer a new avenue for developing high-performance and CO₂-stable cathode materials for IT-SOFCs.

改善阴极材料对氧还原反应（ORR）的活性及其对CO ₂杂质的耐受性对于实现在中间温度（IT-SOFC）下运行的固体氧化物燃料电池的应用至关重要。在这里，通过采用A和B位点共掺杂策略，我们报告一个新的钙钛矿型氧化物，钕_0.2锶_0.8的Nb _0.1钴_0.9 ø _3-δ（N0.2SNC）作为活性和CO ₂ -用于IT-SOFC的耐阴极材料。与单中心掺杂的Nd相比_0.2锶_0.8的CoO _3-δ（N0.2SC，A位掺杂）和SRNB _0.1钴_0.9O3 _-δ（SNC，B部位掺杂）和母体氧化物SrCoO3 _-δ（SC），N0.2SNC对ORR具有改善的电催化活性，并具有出色的抗CO _2中毒性，从而实现了低面积比电阻（ASR） ）在650°C时为0.037Ωcm ^2）。另外，N0.2SNC电极的ASR值在空气中含有5％CO _2的情况下运行300分钟后，仅从0.08Ωcm ²增加到0.20Ωcm ₂。通过共掺杂可以获得A和B位阳离子协同作用，从而提高性能。在650℃下达到1563mWcm ^-2的峰值功率密度。这种A位和B位阳离子协同作用可能为开发高性能和CO ₂提供了新途径用于IT-SOFC的稳定阴极材料。