Field-assisted electrocatalytic reactions are demonstrated to be sufficient strategies in enhancing the electrocatalyst activities for oxygen evolution reaction (OER). Here, we report the in-situ magnetic field enhanced electrocatalytic activity in ferromagnetic FeCo₂O₄ nanofibers. Our results demonstrate that the overpotential of FeCo₂O₄ nanofibers at 10 mA cm⁻² shows a left-shift of 40 mV for the OER by applying an external magnetic field, and no obvious change has been observed in the non-ferromagnetic-order Co₃O₄ nanofibers. Calculation results indicate that there are more overlaps between the density of states for Co 3d and O 2p by applying an external magnetic field. Accordingly, the spin hybridization of 3d-2p and the kinetics of spin charge transfer are optimized in ferromagnetic FeCo₂O₄, which can promote the adsorption of oxygen-intermediates and electron transfer, significantly improving its electrocatalytic efficiency. What’s more, the maximum power density of the FeCo₂O₄ nanofibers based Zn-air battery (ZAB) increases from 97.3 mW cm⁻² to 108.2 mW cm⁻² by applying an external magnetic field, providing a new idea for the application of magnetic cathode electrocatalysts in ZABs.

场辅助电催化反应被证明是提高析氧反应 (OER) 电催化剂活性的充分策略。在这里，我们报告了原位磁场增强铁磁性 FeCo ₂ O ₄纳米纤维中的电催化活性。我们的结果表明，FeCo ₂ O ₄纳米纤维在 10 mA cm ^-2的过电势表明，通过施加外部磁场，OER 左移 40 mV，并且在非铁磁序中没有观察到明显的变化Co ₃ O ₄纳米纤维。计算结果表明Co 3 d的态密度之间有更多的重叠和 O 2 p通过施加外部磁场。_{因此，铁磁性FeCo 2} O _4中3 d -2 p的自旋杂化和自旋电荷转移动力学得到优化，可以促进氧中间体的吸附和电子转移，显着提高其电催化效率。此外，通过外加磁场， FeCo ₂ O ₄纳米纤维基锌空气电池（ZAB）的最大功率密度从97.3 mW cm ^-2提高到108.2 mW cm ^-2 ，为该电池的应用提供了新思路。 ZAB 中的磁性阴极电催化剂。