Nanofibers with unique structures and multiple components have attracted more and more attention, which could combine multi-functions in one entity. Janus-type biphasic nanofibers with unique structure can be quickly obtained by electrospinning technology. We produced CoO_x/C nanofibers with Janus structure by self-made side-by-side electrospinning spinneret, combined with electrospinning technology and heat treatment. CoO_x/C nanofibers had a large amount of graphitic carbon distributed on one half of the Janus nanofiber, and CoO_x/C nanoparticles were embedded in the other half of the Janus nanofiber and distributed uniformly. CoO_x/C acted as ORR catalysis, and graphitic carbon, pridinc-N and CoO_x in CoO_x/C had a synergistic effect on their catalytic activity. The results confirmed that CoO_x/C was dominated by four-electron pathway under alkaline conditions, and the Tafel slope was lower than that of commercial Pt/C catalysts. The preparation method of this work is simple and easy, the structure is controllable, and the composition is adjustable, which provides a feasible way for preparing Janus structure nanofibers with different functions.

中文翻译：

---

电纺Janus型CoO x / C纳米纤维作为氧还原反应的电催化剂

具有独特结构和多种成分的纳米纤维已引起越来越多的关注，它们可以将多功能组合在一个实体中。通过静电纺丝技术可以快速获得具有独特结构的Janus型双相纳米纤维。我们通过自制的并排静电纺丝喷丝头，结合静电纺丝技术和热处理，生产了具有Janus结构的CoO _x / C纳米纤维。CoO _x / C纳米纤维在Janus纳米纤维的一半上分布有大量的石墨碳，而CoO _x / C纳米颗粒被嵌入Janus纳米纤维的另一半并均匀分布。CoO _x / C充当ORR催化，而石墨化碳，Pridinc-N和CoO _x在CoO中_x / C对它们的催化活性具有协同作用。结果证实，在碱性条件下，CoO _x / C以四电子路径为主，其Tafel斜率低于商用Pt / C催化剂。本发明的制备方法简便易行，结构可控，组成可调，为制备功能不同的Janus结构纳米纤维提供了可行的途径。