Aluminum-air batteries with merits of high theoretical energy densities, low cost and environmental-friendliness are promising candidates for next-generation energy storage and conversion systems. Rational design of efficient heterogeneous catalysts for oxygen reduction reaction (ORR) in neutral and alkaline solutions is of great significance for aluminum-air batteries. Herein, an interface engineering strategy is proposed to realize Co₃Fe₇-Fe₃C heterostructure with abundant interfaces anchored on 3D honeycomb-like N-doped carbon, which inherits the original structure of the biomass precursor. The as-prepared Co₃Fe₇-Fe₃C heterostructure on honeycomb-like N-doped carbon (denoted as Co₃Fe₇-Fe₃C/HNC) displays remarkable electrocatalytic activity and stability towards ORR in both alkaline and neutral solutions. It shows a very positive onset potential of 0.98 V and a half-wave potential of 0.90 V in 0.1 M KOH solution (E_onset = 0.78 V and E_1/2 = 0.64 V in 3.5% NaCl solution) towards ORR. The high ORR performance is mainly ascribed to the abundant engineered interfaces, which can not only boost the intrinsic activity, but also guarantee fast charge transfer. The superior ORR performance is also supported by the density functional theory calculation. Moreover, the fabricated Al-air battery displays a larger working voltage and a higher power density compared with those of Pt/C. Furthermore, the Co₃Fe₇-Fe₃C/HNC catalyst exhibits outstanding stability and durability during mechanical recharging and continuous charging processes. This work demonstrates a new strategy to design and construct multifunctional catalysts with interfacial structure for high performance metal-air batteries.

铝空气电池具有较高的理论能量密度，低成本和环境友好的优点，是下一代能量存储和转换系统的有希望的候选者。合理设计用于中性和碱性溶液中氧还原反应（ORR）的高效多相催化剂对铝空气电池具有重要意义。本文提出了一种界面工程策略，以实现具有丰富界面的Co ₃ Fe ₇ -Fe ₃ C异质结构锚定在3D蜂窝状N掺杂碳上，该异质结构继承了生物质前体的原始结构。所制备的Co ₃ Fe ₇ -Fe ₃蜂窝状氮掺杂碳（表示为Co ₃ Fe ₇ -Fe ₃ C / HNC）上的C异质结构在碱性和中性溶液中均表现出显着的电催化活性和对ORR的稳定性。它在0.1 M KOH溶液中显示出0.98 V的正正启动电位和0.90 V的半波电势（E_起始= 0.78 V和E _1/2=在3.5％NaCl溶液中为0.64 V）。较高的ORR性能主要归因于丰富的工程接口，这不仅可以提高固有活性，而且可以保证快速的电荷转移。密度泛函理论计算还支持出色的ORR性能。而且，与Pt / C相比，制成的铝空气电池显示出更大的工作电压和更高的功率密度。此外，Co ₃ Fe ₇ -Fe ₃ C / HNC催化剂在机械充电和连续充电过程中表现出优异的稳定性和耐久性。这项工作展示了一种设计和构造具有界面结构的多功能催化剂的新策略，用于高性能金属空气电池。