Electrocatalyst for oxygen-reduction reaction (ORR) is crucial for metal-air batteries, in which Pt-based materials are the benchmark catalysts for ORR. However, the high cost and limited supplies of Pt limit its broad use in commercial applications. Designing highly efficient Pt electrocatalysts can reduce material cost and enable commercial success for a wide variety of electrochemical technologies. Herein, we prepared Pt/MnO_x and Pt/MnO electrocatalysts via deposition–precipitation and H₂–reduction approaches. The Pt mass activities towards the ORR at 0.7 V for the Pt/MnO_x, and Pt/MnO catalysts were 4.0 and 3.7 A mg_Pt⁻¹, respectively, which were 20, and 18.5 times as commercial 20% Pt/C catalyst. The transferred electron numbers (n) were 3.6 and 4.0 for Pt/MnO_x and Pt/MnO, respectively. Moreover, Pt/MnO catalyst exhibited a good ORR stability after 500 cycles compared to Pt/MnO_x catalyst in 0.1 M KOH.

氧还原反应（ORR）的电催化剂对于金属空气电池至关重要，其中Pt基材料是ORR的基准催化剂。然而，Pt的高成本和有限的供应限制了其在商业应用中的广泛使用。设计高效的Pt电催化剂可以降低材料成本，并为多种电化学技术带来商业成功。在这里，我们通过沉积沉淀和H ₂还原方法制备了Pt / MnO _x和Pt / MnO电催化剂。Pt / MnO _x在0.7 V时对ORR的Pt质量活度为4.0和3.7 A mg _Pt ^-1分别是市售20％Pt / C催化剂的20倍和18.5倍。Pt / MnO _x和Pt / MnO的转移电子数（n）分别为3.6和4.0 。此外，与在0.1 M KOH中的Pt / MnO _x催化剂相比，Pt / MnO催化剂在500次循环后表现出良好的ORR稳定性。