Oxygen reduction reaction (ORR) is the key reaction in various electrochemical energy devices. This work reports an inexpensive mesoporous LaMnO_3+δ perovskite for ORR with remarkable activity, synthesized by a facile aerosol-spray assisted approach. The mesoporous LaMnO_3+δ material shows a factor of 3.1 higher activity (at 0.9 V vs. RHE) than LaMnO₃ obtained from co-precipitation method (LMO-CP). Based on results of x-ray absorption near-edge spectroscopy (XANES), x-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) analysis, we conclude that the chemical state of surface Mn and the high surface area are the sources to the notably enhanced activity. The study of Zn-air batteries device further confirmed a Pt/C comparable performance in the practical devices with the novel mesoporous LaMnO_3+δ catalyst, where the power density at 200 mA/cm² is only 2.1% lower than in the battery with same-loaded Pt/C catalyst. Therefore, the high mass activity and low-cost of Mn/La may make LaMnO_3+δ further approach to the application of electrochemical devices.

氧还原反应（ORR）是各种电化学能源设备中的关键反应。这项工作报告了一种廉价的介孔LaMnO _{3 +δ}钙钛矿，用于ORR，具有显着的活性，是通过一种简便的气溶胶喷雾辅助方法合成的。中孔LaMnO _{3 +δ}材料的活性（在0.9 V对RHE时）比LaMnO ₃高3.1倍从共沉淀法（LMO-CP）获得。根据x射线吸收近边缘光谱（XANES），x射线光电子能谱（XPS）和Brunauer–Emmett–Teller（BET）分析的结果，我们得出结论，表面Mn的化学态和高表面积是显着增强活动的来源。Zn-空气电池装置的研究进一步证实了使用新型中孔LaMnO _{3 +δ}催化剂在实际装置中具有可比的Pt / C性能，其中200 mA / cm ^2时的功率密度仅比使用PMMA的电池低2.1％。相同负载的Pt / C催化剂。因此，Mn / La的高质量活度和低成本可能使LaMnO _{3 +δ}成为电化学装置应用的进一步途径。