Exploring highly efficient bifunctional oxygen electrocatalysts are urgently for realizing rechargeable zinc-air batteries. Although CoFe₂O₄ as bifunctional oxygen electrocatalyst has been involved in less previous studies, CoFe₂O₄@CNTs as the high performance air cathode has not been reported. In this paper, the influences of temperature, time and the weight ratio of CNT to CoFe₂O₄ on the morphology, crystallographic forms and electrochemical performances of the final products are thoroughly investigated. The conclusion that amorphous form is efficient for ORR and, the crystalline structure is beneficial for OER was proposed. Particularly, a novel class of CoFe₂O₄@CNTs with amorphous form and crystalline structure has been successfully synthesized and exhibited excellent activity and stability in three electrodes test. More importantly, the CoFe₂O₄@CNTs cathodes are made and applied to zinc-air battery, which is demonstrated to be superior performances to Pt/C and IrO₂ catalysts. The high power density (333.7 mW cm⁻²), larger specific capacity (732 mAh g⁻¹), and excellent rechargeability (1200 stable charge-discharge cycles) proves the feasibility of CoFe₂O₄@CNTs application in large power energy-storage and conversion electronics.

为了实现可再充电的锌空气电池，迫切需要探索高效的双功能氧电催化剂。虽然由CoFe ₂ Ø ₄双功能氧电已参与较少以前的研究中，由CoFe ₂ Ø _4个尚未见报道@CNTs作为高性能空气阴极。本文详细研究了温度，时间和碳纳米管与CoFe ₂ O ₄的重量比对最终产物的形貌，晶体形态和电化学性能的影响。提出了无定形形式对ORR有效且晶体结构对OER有利的结论。特别是新型的CoFe ₂已成功合成了具有非晶形式和晶体结构的O ₄ @CNT，并在三电极测试中表现出出色的活性和稳定性。更重要的是，制备了CoFe ₂ O ₄ @CNTs阴极并将其应用于锌-空气电池，这被证明具有优于Pt / C和IrO ₂催化剂的性能。高功率密度（333.7 mW cm ^-2），较大的比容量（732 mAh g ^-1）和出色的充电性（1200个稳定的充放电循环）证明了CoFe ₂ O ₄ @CNTs在大功率能源中的可行性。存储和转换电子产品。