Zinc air battery (ZAB) is one of promising devices to solve the problems of fossil energy consumption and environmental pollution, but the development of low-cost non-precious metal dual-functional catalysts for ZAB still remains a great challenge. Here, we synthesize a bifunctional catalyst (Co_5.47N/Co₃Fe₇/NC) consisting of two kinds of active sites. The Co_5.47N/Co₃Fe₇/NC catalyst shows excellent electrocatalytic activities with a half-wave potential of 0.89 V (versus RHE) for ORR and a low potential of 1.609 V at 10 mA cm⁻² for OER in alkaline condition. When the catalyst was used in ZAB, the ZAB provides a maximal power density of 264 mW cm⁻² and maintains a stable voltage gap over 180 h. The results show that Co_5.47N plays a very important role in both ORR and OER processes, because it effectively improves the conductivity of catalysts. Moreover, the two-phase interface produced by the two crystal structures will produce an electronic coupling effect, forming a large number of active sites. This catalyst provides a reliable alternative to air cathode catalysts for rechargeable zinc air batteries.

锌空气电池（ZAB）是解决化石能源消耗和环境污染问题的有前景的装置之一，但开发用于ZAB的低成本非贵金属双功能催化剂仍然是一个巨大的挑战。在这里，我们合成了由两种活性位点组成的双功能催化剂（Co _5.47 N/Co ₃ Fe _{7 /NC）。}Co _5.47 N/Co ₃ Fe ₇ /NC 催化剂表现出优异的电催化活性，ORR 的半波电位为 0.89 V（相对于 RHE），碱性条件下 OER 在10 mA cm ^{-2时的低电位为 1.609 V。}当催化剂用于 ZAB 时，ZAB 提供的最大功率密度为 264 mW cm^-2并在 180 小时内保持稳定的电压间隙。结果表明，Co _5.47 N在ORR和OER过程中都起着非常重要的作用，因为它有效地提高了催化剂的电导率。而且，两种晶体结构产生的两相界面会产生电子耦合效应，形成大量的活性位点。该催化剂为可充电锌空气电池提供了空气阴极催化剂的可靠替代品。