(Co,Fe)₃O₄ nanoparticles are decorated onto N‐doped carbon nanotubes at room temperature through a simple mixing process and are simultaneously deposited within a porous gas diffusion layer (GDL) by an impregnation technique. The (Co,Fe)₃O₄ nanoparticles are identified as the spinel phase through transmission electron microscopy (TEM) and X‐ray photoelectron spectroscopy (XPS) analysis. The composite GDL is used as the air electrode for Zn‐air batteries and shows excellent performance as a bifunctional catalyst with initial discharge and charge potentials of 1.19 V and 2.00 V, respectively, at 20 mA cm⁻². Cycling performance of the impregnated electrode compares favourably with benchmark Pt‐RuO₂ catalysts at both 10 mA cm⁻² and 20 mA cm⁻². The (Co,Fe)₃O₄/N‐CNT impregnated GDL had a final discharge/charge efficiency of 58.5 % after 100 h (200 cycles) of bifunctional cycling at 10 mA cm⁻², which is superior to that of Pt‐RuO₂ (55.3 % efficiency). The cycling efficiency for (Co,Fe)₃O₄/N‐CNT impregnated GDL at 20 mA cm⁻² is also better than that for Pt−Ru (53.5 % vs 41.3 % after 50 h (100 cycles)). The result is a simple and easily scalable one‐pot electrode synthesis method for high performing bi‐functional air electrodes for Zn‐air batteries.

中文翻译：

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纳米复合气体扩散层中的（Co，Fe）3O4装饰的掺氮碳纳米管作为可充电锌空气电池的高度稳定的双功能催化剂

（Co，Fe）₃ O ₄纳米粒子通过简单的混合过程在室温下装饰在N掺杂的碳纳米管上，并通过浸渍技术同时沉积在多孔气体扩散层（GDL）中。通过透射电子显微镜（TEM）和X射线光电子能谱（XPS）分析，将（Co，Fe）₃ O ₄纳米颗粒鉴定为尖晶石相。复合GDL用作Zn-air电池的空气电极，并显示出出色的性能，作为双功能催化剂，在20 mA cm ^-2时的初始放电和充电电位分别为1.19 V和2.00V 。浸渍电极的循环性能优于基准Pt-RuO ₂10 mA cm ^-2和20 mA cm ^-2的催化剂。（Co，Fe）₃ O ₄ / N-CNT浸渍的GDL在10 mA cm ^-2的双功能循环100 h（200个循环）后的最终放电/充电效率为58.5％，优于Pt- RuO ₂（55.3％的效率）。（Co，Fe）₃ O ₄ / N-CNT浸渍的GDL在20 mA cm ^-2处的循环效率也比Pt-Ru的循环效率更好（50 h（100个循环）后为53.5％对41.3％）。结果是一种用于锌空气电池的高性能双功能空气电极的简单且易于扩展的单锅电极合成方法。