In this work, abundant oxygen vacancies are introduced into NdBaCo₂O_5+δ (NBCO) by partial substitution of cobalt to facilitate the electrochemical activity of ORR. The oxygen vacancy concentration of NdBaCo_1.8Sc_0.2O_5+δ (NBCSc-2) is more than twice as that of NdBaCo₂O_5+δ. The increased oxygen surface exchange, bulk diffusion coefficients and adequate conductivity for NBCSc-2 can be responsible for the decrease of oxygen ion transfer activation energy. Consequently, the NBCSc-2 cathode shows a significantly reduced polarization impedance of 0.035 Ω cm² at 700 °C, which is only about 35% of NBCO. We also investigate the influence of the doping strategy on the stability of cathode. Thus, the enhanced ORR kinetics and high durability make NBCSc-2 as potential cathode material for solid oxide fuel cells.

在这项工作中，通过部分取代钴将大量氧空位引入NdBaCo ₂ O _{5 +δ}（NBCO）中，以促进ORR的电化学活性。NdBaCo的氧空位浓度_1.8钪_0.2 ø _{5 +δ}（NBCSc-2）超过两倍于NdBaCo的₂ ö _{5 +δ}。NBCSc-2的增加的氧表面交换，体积扩散系数和足够的电导率可导致氧离子转移活化能的降低。因此，NBCSc-2阴极的极化阻抗显着降低了0.035Ωcm ²在700°C下，仅约NBCO的35％。我们还研究了掺杂策略对阴极稳定性的影响。因此，增强的ORR动力学和高耐久性使NBCSc-2成为固体氧化物燃料电池的潜在阴极材料。