Bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts with the advantages of excellent activity and stability are the vital components of air cathodes for rechargeable Zn-air batteries (ZABs). Herein, the carbon aerogel with honeycomb-like structure, N and S double doping and loaded with FeCo alloy nanoparticles (NSCA/FeCo) was prepared successfully as cathodes for rechargeable liquid flow and two-dimensional flexible ZABs by clever directional casting. The interaction between the bimetallic alloy and the double-doped carbon with specifical structure, large surface, and great conductivity endows NSCA/FeCo with effective ORR/OER active sites and small charge/mass transport barrier, thus achieving outstanding bifunctional catalytic performance. The NSCA/FeCo displays a half-wave potential of +0.85 V (vs. reversible hydrogen electrode (RHE)) for ORR and an overpotential of 335 mV at a current density of 10 mA·cm⁻² for OER, which is even comparable to the performance of noble-metal catalysts in relevant fields (Pt/C for ORR and RuO₂ for OER). Consequently, the rechargeable liquid flow ZABs assembled with NSCA/FeCo showed excellent performance (maximum power density: 132.0 mW·cm⁻², specific capacity: 804.5 Wh·kg⁻¹ at 10 mA·cm⁻², charge and discharge cycle stability of more than 250 cycles). Furthermore, the flexible NSCA/FeCo-based ZABs have a maximum power density of 43.0 mW·cm⁻², outstanding charging—discharge stability of more than 450 cycles, and exhibit good flexibility under different bending conditions. Therefore, this work has provided an efficient bifunctional electrocatalyst for OER/ORR and a promising strategy of air cathodes for rechargeable and wearable ZABs.

双功能氧还原反应（ORR）和析氧反应（OER）电催化剂具有优异的活性和稳定性，是可充电锌空气电池（ZAB）空气阴极的重要组成部分。在此，通过巧妙的定向铸造，成功制备了具有蜂窝状结构、N 和 S 双掺杂并负载 FeCo 合金纳米粒子 (NSCA/FeCo) 的碳气凝胶作为可充电液体流动和二维柔性 ZAB 的阴极。双金属合金与具有特殊结构、大表面和高导电性的双掺杂碳之间的相互作用赋予了NSCA/FeCo有效的ORR/OER活性位点和较小的电荷/质量传输势垒，从而实现了出色的双功能催化性能。NSCA/FeCo 的半波电位为 +0.85 V（相对于^-2用于OER，甚至可以与相关领域的贵金属催化剂（用于ORR的Pt/C和用于OER的RuO ₂）的性能相媲美。因此，NSCA/FeCo组装的可充电液流ZABs表现出优异的性能（最大功率密度：132.0 mW·cm ^-2，比容量：804.5 Wh·kg ^-1 at 10 mA·cm ^-2，充放电循环稳定性超过 250 个周期）。此外，柔性 NSCA/FeCo 基 ZAB 的最大功率密度为 43.0 mW·cm ⁻²，出色的充放电稳定性超过450次循环，在不同的弯曲条件下表现出良好的柔韧性。因此，这项工作为 OER/ORR 提供了一种高效的双功能电催化剂，并为可充电和可穿戴 ZAB 的空气阴极提供了一种有前途的策略。