Efficient bifunctional oxygen electrocatalysts are essential for high-performance rechargeable Zn-air batteries (rZABs). Herein, a porous hollow carbon nanoshell (H-Co@FeCo/N/C) in which FeN_x and CoN_x metal sites are atomically dispersed and interfaced intimately with metallic Co nanoparticles was derived from pyrolysis of polydopamine-coated ZnCo-ZIFs adsorbed with Fe³⁺; the chemical interactions among different organic and metal species during the polymer-coating process was inverstigated; their role in regulating the size of the Co nanoparticles, the structure of the hollow carbon nanoshell and the formation of the FeN_x-CoN_x dual active sites was revealed. The H-Co@FeCo/N/C showed superior bifunctional oxygen electrocatalytic activity (ΔE = 0.698 V) and mass activity of 6.8 A g_cat.⁻¹ at 0.9 V, outperforming the commercial Pt/C/RuO₂ catalysts or the Fe/N/C or Co/N/C counterparts. When assembled for rZABs, the H-Co@FeCo/N/C cathode displayed a long cycle life of 200 h (E_gap of about 1.0 V@10 mA cm^-2).

高效的双功能氧电催化剂对于高性能可再充电锌空气电池（rZAB）至关重要。本文中，多孔多聚碳纳米管（H-Co @ FeCo / N / C）由Fed _x和CoN _x金属位点原子分散并与金属Co纳米粒子紧密接触而得，它是由吸附了聚多巴胺的ZnCo-ZIFs热解得到的。铁³⁺ ; 研究了聚合物涂层过程中不同有机和金属物种之间的化学相互作用；它们在调节Co纳米颗粒尺寸，中空碳纳米壳结构和FeN _x -CoN _x形成中的作用揭示了两个活动站点。H-Co @ FeCo / N / C显示出优异的双功能氧电催化活性（ΔE  = 0.698 V）和6.8 A g _cat的质量活性_。在0.9 V时为^-1，胜过商用Pt / C / RuO ₂催化剂或Fe / N / C或Co / N / C对应物。当组装用于rZAB时，H-Co @ FeCo / N / C阴极显示出200 h的长循环寿命（E_间隙约为1.0 V @ 10 mA cm ^-2）。