摘要：The development of low-cost and highly efficient bifunctional electrocatalysts toward oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is of critical importance for clean energy devices such as fuel cells and metal-air ***,a sophisticated na nostructure composed of CoS,Co and MoC nanoparticles incorporated in N and S dual-doped porous carbon nanofibers(CoS/Co/MoC-N,SPCNFs)as a high-efficiency bifunctional electrocatalyst is designed and synthesized via an efficient multistep *** as-prepared CoS/Co/MoC-N,S-PCNFs exhibit a positive half-wave potential(E1/2)of0.871 V for ORR and a low overpotential of 289 mV at 10 ma/cm^(2) for OER,outperforming the non-noble metal-based catalysts ***,the assembled Zn-air battery based on CoS/Co/MoC-N,SPCNFs delivers an excellent power density(169.1 mW/cm^(2)),a large specific capacity(819.3 mah/g)and robust durability,demonstrating the great potential of the as-developed bifunctional electrocatalyst in practical *** work is expected to inspire the design of advanced bifunctional nonprecious metal-based electrocatalysts for energy storage.