Polyacrylonitrile (PAN)-based nitrogen-doped carbon nanotubes/nanofibers (NCNTs/NFs) are successfully synthesized by one step using electrospinning technique in combination with impregnation of FeCo-containing solutions and subsequent heat treatment process. Interestingly, individual Fe or Co nanopartides promotes to create many big pores on the fiber surface, while bimetallic Fe-Co ones promote the growth of carbon nanotubes from the PAN-converted carbon sources to form NCNTs/NFs, during high temperature treatment in NH3 atmosphere. Especially, the nanotubes have relatively higher density when adopting the Fe/Co ratio was 1:1. The formed FeCo-containing NCNT/NF (FeCo-NCNT/NF) materials using Fe/Co ratio of 1:1 reveals a comparable catalytic activity but a much higher stability in comparison to commercial 20% Pt/C catalyst, and after 12 h, its activity still remains about 94%. The excellent ORR properties maybe due to the high crystallinity of carbon to resist electrochemical oxidation. This kind of bimetallic FeCo-NCNT/NF materials is of great potential in fuel cells. (C) 2017 Elsevier B.V. All rights reserved.