The exploitation of high‐efficiency, cost‐effective, and stable oxygen reduction reaction (ORR) electrocatalysts is extremely critical for energy storage and conversion technology. The transition metal carbonitrides have been investigated as an alternative to precious metal‐based catalysts. Here, a series of uniform Co nanoparticles encapsulated in nitrogen‐doped porous carbon fibers (Co@N‐PCFs for brevity) are designed and synthesized by directly carbonizing the Zn_xCo_1–x‐zeolitic imidazolate frameworks@polyacrylonitrile (Zn_xCo_1–x‐ZIFs@PAN) electrospun nanofibers. By precisely controlling the Zn/Co molar ratio in the Zn_xCo_1–x‐ZIFs precursor and carbonization temperature, a higher activity and stability ORR catalyst of Co@N‐PCF‐3 is prepared. The results reveal that Co@N‐PCF‐3 exhibits outstanding ORR activity outperformed commercial Pt/C with more positive half‐wave potential of −134 mV versus Ag/AgCl, high selectivity to four‐electron pathway (n ≈ 3.9), as well as remarkable stability and methanol tolerance. Remarkably, it is one of the highest ORR catalysts among the cobalt carbonitrides reported in the literature.

中文翻译：

---

从双金属有机骨架的电纺纤维衍生出的钴@氮掺杂多孔碳纤维，可有效降低氧气含量

高效，经济高效且稳定的氧还原反应（ORR）电催化剂的开发对于储能和转化技术至关重要。过渡金属碳氮化物已被研究作为贵金属基催化剂的替代品。在这里，通过直接碳化Zn _x Co _{1– x}沸石咪唑酸酯骨架@聚丙烯腈（Zn _x Co _{1 – x} –ZIFs @ PAN）电纺纳米纤维。通过精确控制Zn _x Co _{1– x中}的Zn / Co摩尔比制备ZIFs的前驱体和碳化温度，制备具有更高活性和稳定性的Co @ N-PCF-3 ORR催化剂。结果表明，联合@ N-PCF-3表现出杰出的ORR活性优于商业的Pt / C与-134毫伏与银/氯化银，高选择性的更正半波电势到四个电子通路（Ñ ≈3.9），作为以及出色的稳定性和甲醇耐受性。值得注意的是，它是文献中报道的碳氮化钴中最高的ORR催化剂之一。