Developing cost-effective, efficient and stable air cathodes, involving oxygen reduction/oxygen evolution reactions (ORR/OER), is the crux of the large-scale application of reversible Zinc-air batteries. Herein, 1D/2D hierarchical N doping carbon architecture encapsulating FeCo nanoalloys were successfully constructed by one-step annealing leaf-like ZnFeCo-ZIFs. Benefiting from the unique 1D/2D hierarchical porous feature with high specific surface area, sufficient accessible catalytic sites, not easy entanglements and efficient electron and mass transfer capacity, as well as the advantages of the strong electronic coupling in FeCo alloys, the as-prepared FeCo@ 1D-CNTs/2D-NC catalysts exhibited prominent bifunctional oxygen catalytical performances with a positive half-wave potential (E = 0.87 V vs. reversible hydrogen electrode (RHE)) for the oxygen reduction reaction and a low overpotential (η = 396 mV) at a current density of 10 mA cm for the oxygen evolution reaction, manifesting a low reversible potential gap (ΔE = 0.756 V). The zinc-air battery equipped with FeCo@ 1D-CNTs/2D-NC as the cathode catalyst exhibited a higher peak power density (98.2 mW cm) and specific capacity (741 mAh g) than that assembled with the commercial Pt/C This study provides a convenient strategy to explore non-precious metal based bifunctional electrocatalysts for reversible Zinc-air battery scale applications.

中文翻译：

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通过一步退火叶状 ZnFeCo-ZIF 构建封装 FeCo 合金的 1D/2D 分级碳结构，用于可逆锌空气电池中的高效双功能氧电催化

开发具有成本效益、高效且稳定的空气正极，涉及氧还原/析氧反应（ORR/OER），是可逆锌空气电池大规模应用的关键。在此，通过一步退火叶状 ZnFeCo-ZIFs 成功构建了封装 FeCo 纳米合金的 1D/2D 分层 N 掺杂碳结构。得益于FeCo合金独特的一维/二维分级多孔特征、高比表面积、充足的催化位点、不易缠结和高效的电子和传质能力，以及FeCo合金中强电子耦合的优势，所制备的FeCo@ 1D-CNTs/2D-NC催化剂表现出突出的双功能氧催化性能，氧还原反应具有正半波电位（E = 0.87 V vs.可逆氢电极（RHE））和低过电位（η = 396） mV）在10 mA cm的电流密度下进行析氧反应，表现出低可逆电位间隙（ΔE = 0.756 V）。采用 FeCo@ 1D-CNTs/2D-NC 作为阴极催化剂的锌空气电池表现出比商用 Pt/C 组装的锌空气电池更高的峰值功率密度（98.2 mW cm）和比容量（741 mAh g）。为探索用于可逆锌空气电池规模应用的非贵金属双功能电催化剂提供了便捷的策略。