Abstract Rare earth metals have been widely investigated for oxygen reduction reaction (ORR) owing to their special 4f shell electronic configurations. However, the systematic comparisons of ORR activity with different rare earth have yet rarely studied. Herein, a series of rare earth (La, Ce, Pr, Sm, Eu, Tb, Er, Tm and Yb) oxides electrocatalysts were prepared with ketjin black EC300J as carbon support, in which the addition of rare earth is optimized. The ORR activities of different rare earth were evaluated by rotating disk electrode technology. The ORR performance of rare earth oxides composited carbon catalysts can be enhanced through accommodating oxygen vacancies. Then, the rare earth composite catalyst with the best ORR activities was chosen to detailed exploration. For practical application, the performance of rechargeable Zn-air battery was also researched. We believe that our work lay a good foundation to further explore rare earth based ORR catalyst with higher ORR performance.

中文翻译：

---

ReOx/NC (Re = La, Ce, Pr, Sm, Eu, Tb, Er, Tm and Yb)-尤其是Pr6O11/NC通过调节氧空位增强氧还原反应性能及其在锌-空气电池中的应用

摘要 稀土金属由于其特殊的 4f 壳电子配置而被广泛研究用于氧还原反应 (ORR)。然而，对不同稀土的 ORR 活性进行系统比较的研究还很少。在此，以科金黑EC300J为碳载体制备了一系列稀土（La、Ce、Pr、Sm、Eu、Tb、Er、Tm和Yb）氧化物电催化剂，其中优化了稀土的添加量。采用旋转圆盘电极技术评价了不同稀土元素的ORR活性。稀土氧化物复合碳催化剂的ORR性能可以通过调节氧空位来提高。然后，选择ORR活性最好的稀土复合催化剂进行详细探索。对于实际应用，还研究了可充电锌空气电池的性能。我们相信我们的工作为进一步探索具有更高ORR性能的稀土基ORR催化剂奠定了良好的基础。