Transition metal- and N-codoped carbon nanotubes (CNTs) have superior catalytic activity because the curling surface enhances the bonding ability of atoms within CNTs to other species. However, it is a great challenge to prepare CNTs with transition metal- and N-doped at high level during the growth of CNTs. Here, (Fe,N-codoped CNT)/(Fe-based nanoparticle) (Fe,N-CNT/FeNP) hybrid nanostructures are for the first time prepared through the carbonization of Fe-doped g-C₃N₄. The doping of Fe and N is simultaneously realized during the formation of CNTs. Meanwhile, the abundant and homogeneous Fe and N in Fe-doped g-C₃N₄ ensure high-level and uniform doping of Fe and N in CNTs. The Fe,N-CNT/FeNP hybrid nanostructures have several types of active components, including homogeneously distributed coordinating Fe moieties (FeC_xN_y or FeN_x) and CFe_15.1 nanoparticles embedded in Fe,N-CNTs, towards oxygen reduction reaction (ORR). A superior ORR electrocatalytic performance is therefore obtained on the Fe,N-CNT/FeNP nanohybrids. Our preparation method opens an avenue to preparation of CNTs with transition metal- and N-doping at high-level, and the superior performance of Fe,N-CNT/FeNP nanostructures for ORR will be very helpful to the development of fuel cells and metal-air batteries.

过渡金属和N掺杂的碳纳米管（CNT）具有出色的催化活性，因为卷曲表面增强了CNT中原子与其他物种的结合能力。然而，在CNT的生长过程中制备高水平过渡金属和N掺杂的CNT是一个巨大的挑战。在此，（Fe，N-掺杂的CNT）/（Fe-基纳米颗粒）（Fe，N-CNT / FeNP）杂化纳米结构是通过碳化Fe-掺杂的gC ₃ N ₄首次制备的。Fe和N的掺杂在CNT的形成过程中同时实现。同时，掺杂Fe的gC ₃ N _4中的Fe和N含量丰富且均匀确保对CNT中的Fe和N进行高水平且均匀的掺杂。Fe，N-CNT / FeNP杂化纳米结构具有多种类型的活性成分，包括均匀分布的配位Fe部分（FeC _x N _y或FeN _x）和嵌入Fe，N-CNT中的CFe _15.1纳米颗粒，用于氧还原反应（ORR） ）。因此，在Fe，N-CNT / FeNP纳米杂化物上获得了优异的ORR电催化性能。我们的制备方法为高水平掺入过渡金属和N掺杂的CNT开辟了道路，Fe，N-CNT / FeNP纳米结构在ORR方面的优异性能将对燃料电池和金属的开发非常有帮助。空气电池。