Iron-based single-atom catalysts (SACs) are considered to the most promising catalysts to replace Pt for efficient oxygen reduction reaction (ORR). However, the precise synthesis of high-performance SACs and the understanding of their ORR origin remain challenging. In this work, microporous nitrogen-doped carbon with abundant and accessible atomically dispersed N-coordinated Fe sites (Fe-N-C) is prepared by molecular-confined coupling pyrolysis strategy. The Fe-N-C exhibits excellent ORR activities in acid (E of 0.78 V vs. RHE) and alkaline (E of 0.91 V vs. RHE) electrolytes. When integrated into a rechargeable aqueous Zinc-air battery (ZAB), both large specific capacity (770 mAh g) and high peak power density (240 mW cm) are achieved. Remarkably, the as-prepared ZAB presents amazing charge-discharge cycle performance of 1600 h at the large current density, which is 52.5 times of that using Pt/C+RuO. Furthermore, all-solid-state ZAB delivers ultra-robust cycling stability even under bending. This work may advance a critical step towards the design of rational and controlled preparation of remarkable and ultra-stable catalysts.

中文翻译：

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轻松合成铁单原子电催化剂，用于高性能氧还原反应和卓越的可充电锌空气电池

铁基单原子催化剂（SAC）被认为是最有希望替代 Pt 进行高效氧还原反应（ORR）的催化剂。然而，高性能 SAC 的精确合成以及对其 ORR 起源的理解仍然具有挑战性。在这项工作中，通过分子限制耦合热解策略制备了具有丰富且易接近的原子分散的N配位Fe位点（Fe-NC）的微孔氮掺杂碳。 Fe-NC 在酸性（E 为 0.78 V，相对于 RHE）和碱性（E 为 0.91 V，相对于 RHE）电解质中表现出优异的 ORR 活性。当集成到可充电水性锌空气电池（ZAB）中时，可以实现大比容量（770 mAh g）和高峰值功率密度（240 mW cm）。值得注意的是，所制备的ZAB在大电流密度下表现出惊人的1600小时的充放电循环性能，是使用Pt/C+RuO的52.5倍。此外，全固态 ZAB 即使在弯曲情况下也能提供超强的循环稳定性。这项工作可能会朝着设计合理和受控制备卓越且超稳定催化剂的方向迈出关键一步。