Rechargeable zinc–air batteries (ZABs) are regarded as a remarkably promising alternative to current lithium-ion batteries, addressing the requirements for large-scale high-energy storage. Nevertheless, the sluggish kinetics involving oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) hamper the widespread application of ZABs, necessitating the development of high-efficiency and durable bifunctional electrocatalysts. Here, we report oxygen atom–bridged Fe, Co dual-metal dimers (FeOCo-SAD), in which the active site Fe–O–Co–N 6 moiety boosts exceptional reversible activity toward ORR and OER in alkaline electrolytes. Specifically, FeOCo-SAD achieves a half-wave potential ( E 1/2 ) of 0.87 V for ORR and an overpotential of 310 mV at a current density of 10 mA cm –2 for OER, with a potential gap (Δ E ) of only 0.67 V. Meanwhile, FeOCo-SAD manifests high performance with a peak power density of 241.24 mW cm −2 in realistic rechargeable ZABs. Theoretical calculations demonstrate that the introduction of an oxygen bridge in the Fe, Co dimer induced charge spatial redistribution around Fe and Co atoms. This enhances the activation of oxygen and optimizes the adsorption/desorption dynamics of reaction intermediates. Consequently, energy barriers are effectively reduced, leading to a strong promotion of intrinsic activity toward ORR and OER. This work suggests that oxygen-bridging dual-metal dimers offer promising prospects for significantly enhancing the performance of reversible oxygen electrocatalysis and for creating innovative catalysts that exhibit synergistic effects and electronic states.

中文翻译：

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氧桥铁、钴双金属二聚体促进可充电锌空气电池的可逆氧电催化


可充电锌空气电池（ZAB）被认为是当前锂离子电池的一种非常有前途的替代品，可以满足大规模高能量存储的要求。然而，氧还原反应（ORR）和析氧反应（OER）的缓慢动力学阻碍了ZAB的广泛应用，因此需要开发高效且耐用的双功能电催化剂。在这里，我们报道了氧原子桥联的Fe、Co双金属二聚体（FeOCo-SAD），其中活性位点Fe-O-Co-N 6该部分增强了碱性电解质中 ORR 和 OER 的特殊可逆活性。具体来说，FeOCo-SAD 实现了半波电势（乙1/2 ) 的 ORR 为 0.87 V，电流密度为 10 mA cm 时过电势为 310 mV –2对于 OER，存在潜在差距 (Δ乙）仅为 0.67 V。同时，FeOCo-SAD 表现出高性能，峰值功率密度为 241.24 mW cm −2在现实的可充电 ZAB 中。理论计算表明，在 Fe、Co 二聚体中引入氧桥会引起 Fe 和 Co 原子周围的电荷空间重新分布。这增强了氧气的活化并优化了反应中间体的吸附/解吸动力学。因此，能量壁垒有效减少，从而强烈促进 ORR 和 OER 的内在活性。这项工作表明，氧桥双金属二聚体为显着增强可逆氧电催化性能以及创造具有协同效应和电子态的创新催化剂提供了广阔的前景。