The development of bifunctional activity and long durability of ORR/OER catalyst is vital for realizing the practical application of Zn–air batteries (ZAB). Herein, 3D-structured bifunctional catalysts, CoFe nanoalloy decorated carbon nanotubes (CNT) anchoring with 2D MXene (Fe/Co-CNT@MXene-T), were prepared and fabricated as the cathode for both aqueous and flexible ZAB. Taking advantages of active sites of CoFe nanoparticles, robust sheath and fast charge transfer provided by CNT and MXene, our optimal catalyst Fe/Co-CNT@MXene-8 exhibited remarkable electroactivities of ORR and OER comparable with the benchmark Platinum carbon (Pt/C) and Ruthenium dioxide (RuO₂), respectively. The as-assembled aqueous ZAB with Fe/Co-CNT@MXene-8 as cathode exhibited a high specific capacity of 759 mA h g ⁻¹ at a current density of 10 mA cm⁻², and a stable voltage platform in the quick discharge–charge test under a 375h long-lasting operation, superior to those assembled with benchmark commercial catalyst and other reported catalysts. Furthermore, the as-assembled flexible ZAB with Fe/Co-CNT@MXene-8 as cathode also presented excellent durability cycling and showed promising perspectives as future power sources for wearable application. Such high performance was also verified by X-ray absorption near-edge structure (XANES) and supported by density functional theory (DFT) calculation. This work provides a novel view to design highly effective and long-lasting rechargeable ZABs.

ORR/OER催化剂的双功能活性和长寿命的发展对于实现锌空气电池（ZAB）的实际应用至关重要。在此，制备了 3D 结构的双功能催化剂，CoFe 纳米合金装饰的碳纳米管（CNT）与 2D MXene（Fe/Co-CNT@MXene-T）锚定，作为水性和柔性 ZAB 的阴极。利用 CNT 和 MXene 提供的 CoFe 纳米颗粒的活性位点、坚固的外壳和快速的电荷转移，我们的最佳催化剂 Fe/Co-CNT@MXene-8 表现出显着的 ORR 和 OER 电活性，可与基准铂碳（Pt/C ) 和二氧化钌 (RuO ₂ )，分别。以 Fe/Co-CNT@MXene-8 为阴极组装的水相 ZAB 表现出 759 mA hg ^-1的高比容量在 10 mA cm ^-2的电流密度下，在 375 小时持久运行下的快速放电-充电测试中具有稳定的电压平台，优于那些与基准商业催化剂和其他报道的催化剂组装的催化剂。此外，以 Fe/Co-CNT@MXene-8 作为阴极的组装后的柔性 ZAB 也表现出优异的耐久性循环，并显示出作为可穿戴应用未来电源的前景。这种高性能也得到了 X 射线吸收近边结构 (XANES) 的验证，并得到了密度泛函理论 (DFT) 计算的支持。这项工作为设计高效且持久的可充电 ZAB 提供了一种新颖的视角。