Tailoring Oxygen Electrocatalytic Performance via Construction of Iron‐Cobalt Oxides and FeN₄ Sites on Hierarchical Carbon Fibers for Efficient Zinc–Air Batteries

Abstract The design and fabrication of non‐precious metal materials for bifunctional oxygen electrocatalytic properties with reversible oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) has been a research hotspot in the field of zinc–air batteries. Herein, a hierarchical carbon nanofiber immobilized with iron cobalt oxide particles (FeCoO_x) and Fe‐N_x sites catalyst is synthesized through electrostatic spinning and the in situ polymerization of pyrrole coupled with pyrolysis. The FeCoO_x/Fe─N─C demonstrates a superior bifunctional electrocatalytic performance (E_1/2 = 0.91 V, η₁₀ = 350 mV). Liquid zinc–air batteries employing FeCoO_x/Fe─N─C exhibit a high power of 184.8 mW cm⁻² and more than 580 cycles of stable cycling ability. Additionally, the incorporation of iron cobaltite introduces extra electrons and optimizes the adsorption capacity for oxygen intermediates, effectively boosting the inherent ORR activity. The experimental results illustrate that the special geometrical structure of spinel ferrite provides excellent OER catalytic performance. Theoretical calculations indicate that the incorporation of FeCoO_x shifts the d‐band center of iron closer to the Fermi level (E_f), thereby modulating the hybridization between Fe 3d and O 2p orbitals. This work offers an effective approach to constructing coupling catalysts that have single atoms coexisting with oxide particles for efficient bifunctional catalysis.