The sluggish reaction kinetics of the oxygen reduction reaction (ORR) has been the limiting factor for fuel energy utilization, hence it is desirable to develop high‐performance electrocatalysts for a 4‐electron pathway ORR. A constant low‐current (50 μA) electrodeposition technique is used to realize the formation of a uniform Co₃O₄ film on well‐aligned electrospun carbon nanofibers (ECNFs) with a time‐dependent growth mechanism. This material also exhibits a new finding of mT magnetic field‐induced enhancement of the electron exchange number of the ORR at a glassy carbon electrode modified with the Co₃O₄/ECNFs catalyst. The magnetic susceptibility of the unpaired electrons in Co₃O₄ improves the kinetics and efficiency of electron transfer reactions in the ORR, which shows a 3.92‐electron pathway in the presence of a 1.32 mT magnetic field. This research presents a potential revolution of traditional electrocatalysis by simply applying an external magnetic field on metal oxides as a replacement for noble metals to reduce the risk of fuel‐cell degradation and maximize the energy output.

中文翻译：

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氧还原反应中排列良好的Co3O4 /电纺碳纳米纤维的磁场增强4电子途径

氧还原反应（ORR）的反应动力学缓慢一直是限制燃料能源利用的因素，因此，希望开发出用于4电子途径ORR的高性能电催化剂。恒定的低电流（50μA）电沉积技术用于在具有良好时间依赖性的生长机制的良好排列的电纺碳纳米纤维（ECNF）上形成均匀的Co ₃ O ₄膜。在用Co ₃ O ₄ / ECNFs催化剂修饰的玻璃碳电极上，这种材料还表现出mT磁场诱导的ORR电子交换数增加的新发现。Co ₃ O _4中未成对电子的磁化率改善了ORR中电子转移反应的动力学和效率，在存在1.32 mT磁场的情况下显示了3.92-电子路径。这项研究通过简单地在金属氧化物上施加外部磁场来代替贵金属来降低燃料电池退化的风险并最大程度地提高能量输出，从而提出了传统电催化的潜在革命。