The one-dimensional filamentous carbon nanofibers hold great promise to substitute noble catalysts ascribing to the excellent physicochemical properties, environmentally friendly, easy to prepare, etc. Synthesizing non-noble catalysts with outstanding electro-catalytic activity for oxygen reduction reaction and excellent durability and application in the field of commercialization still exist lots of challenges. Herein, we report a facile synthesis of carbon nanofibers coated with iron doping nitrogen-carbon (Fe/N–C@CNFs) derived from carbon nanofibers coated with polyaniline (PANI@CNFs) via chemical vapor deposition and heat-treatment, which exhibit an outstanding catalytic activity toward oxygen reduction reaction. In detail, the Fe/N–C@CNFs exhibit onset potential of 0.99 V (vs RHE) and half-wave potential of 0.80 V (vs RHE) in 0.1 M KOH solution, indicating superior electrochemical activity for oxygen reduction reaction (ORR). Meantime, the transferred electron number of oxygen reduction reaction was 3.77, suggesting a nearly 4e⁻ transferring process with little intermediate product (H₂O₂). Moreover, the relative current value of carbon nanofibers coated with nitrogen-carbon film (N–C@CNFs) and Fe/N–C@CNFs maintain 89.6% and 88.2% respectively after 40,000 s, exhibiting good stability and durability. This facile and easy method could provide inspiration for synthesizing carbon nanofibers-based (CNFs-based) oxygen reduction reaction catalysts with excellent catalytic activity and good stability.

一维丝状碳纳米纤维具有优异的理化性能，环境友好，易于制备等优点，有望替代贵金属催化剂。合成具有优异电催化活性的非贵金属催化剂，可进行氧还原反应，具有优异的耐久性和应用性在商业化领域仍然存在很多挑战。在本文中，我们报告了通过化学气相沉积和热处理，从掺有聚苯胺的碳纳米纤维（PANI @ CNFs）衍生出掺铁掺杂氮碳（Fe / N–C @ CNFs）的碳纳米纤维的合成方法。对氧气还原反应具有出色的催化活性。详细地讲，Fe / N–C @ CNFs在0中的起始电位为0.99 V（vs RHE），半波电位为0.80 V（vs RHE）。1 M KOH溶液，表明对氧还原反应（ORR）具有优异的电化学活性。同时，氧还原反应的转移电子数为3.77，表明接近4e⁻转移过程中中间产物（H ₂ O ₂）少。此外，涂有氮碳膜的碳纳米纤维（N–C @ CNFs）和Fe / N–C @ CNFs的相对电流值在40,000 s后分别保持89.6％和88.2％，表现出良好的稳定性和耐用性。这种简便易行的方法可以为合成具有优异催化活性和良好稳定性的碳纳米纤维基（CNFs）氧还原反应催化剂提供启发。