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 cel...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 batteries.Herein,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 strategy.The 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 reported.Furthermore,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 applications.This work is expected to inspire the design of advanced bifunctional nonprecious metal-based electrocatalysts for energy storage.展开更多
基金the financial support from Natural Science Foundation of China(No.21671173)the Independent Designing Scientific Research Project of Zhejiang Normal University(No.2020ZS03)Zhejiang Provincial Ten Thousand Talent Program(No.2017R52043)。
文摘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 batteries.Herein,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 strategy.The 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 reported.Furthermore,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 applications.This work is expected to inspire the design of advanced bifunctional nonprecious metal-based electrocatalysts for energy storage.
