Exploring highly efficient non-precious metal based catalysts for bifunctional oxygen electrode is crucial for rechargeable metal-air batteries. In this study, with MOFs as precursors, a facile coprecipitation method is designed to realize in-situ growth of the CoNi anchored carbon nanoparticle/nanotube (CoNi/N-CNN) hybrid, which can achieve the simultaneous maximum exposure of both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) active centers. Benefiting from the unique structure, the CoNi/N-CNN catalyst exhibits excellent electrocatalytic performance for ORR (E_onset = 1.183 V, E_1/2 = 0.819 V) and a low operating voltage of 1.718 V at 10 mA cm⁻² (E_j=10) for OER. Delightfully, the home-made rechargeable Zn-air battery with CoNi/N-CNN delivers a high discharge power density up to 209 mW cm⁻², and an outstanding charge–discharge cycling stability. The boosted bifunctional electrocatalytic activity can be ascribed to the strong coupling effect between Co/Ni center sites and defect-rich N-anchored carbon featured with porous and nanotube structure, which can introduce uniformly dispersed active sites, tailored electronic configuration, superb conductivity and convenient charge transfer process. The hybrid non-precious bimetal based electrocatalyst provides the possibility to develop the low-cost and high-efficient ORR/OER bifunctional electrocatalysts in rechargeable metal-air battery.

探索用于双功能氧电极的高效非贵金属催化剂对于可充电金属-空气电池至关重要。在这项研究中，与MOF的作为前体，一个浅显的共沉淀方法被设计为实现在-原位所述的CoNi锚定的碳纳米颗粒/纳米管（的CoNi / N-CNN）的混合，从而可以实现既析氧反应的同时最大曝光的生长(OER) 和氧还原反应 (ORR) 活性中心。受益于独特的结构，CoNi/N-CNN 催化剂表现出优异的 ORR 电催化性能（E _onset  = 1.183 V, E _1/2  = 0.819 V）和在 10 mA cm ^-2 ( E_{j =10} ) 对于 OER。令人高兴的是，自制的带有 CoNi/N-CNN 的可充电锌空气电池可提供高达 209 mW cm ^-2的高放电功率密度和出色的充放电循环稳定性。增强的双功能电催化活性可归因于 Co/Ni 中心位点与具有多孔和纳米管结构的富含缺陷的 N 锚定碳之间的强耦合效应，可以引入均匀分散的活性位点、定制的电子配置、优异的导电性和方便性。电荷转移过程。混合非贵重双金属基电催化剂为在可充电金属-空气电池中开发低成本、高效的ORR/OER双功能电催化剂提供了可能。