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Affiliation of Author(s):材料科学与技术学院

Journal:ACS APPLIED MATERIALS & INTERFACES

Key Words:electrospinning Fe N-codoped carbon nanofiber hierarchical structures oxygen reduction reaction Zn-air batteries

Abstract:Developing porous carbon-based non-precious-metal catalysts for an oxygen reduction reaction (ORR) is a suitable approach to significantly reduce the costs of fuel cells or metal-air batteries. Herein, interconnected hierarchically porous carbon nanofibers simultaneously doped with nitrogen and iron (HP-Fe-N/CNFs) were fabricated by facile pyrolysis of polypyrrole-coated electrospun polystyrene/FeCI3 fibers. The obtained carbon nanofibers have a high specific surface area (569.6 m(2)/g) and large pore volume (1.00 cm(3)/g) as well as effective doping of N and Fe. Benefiting from the improved mass transfer and utilization of active sites attributed to interconnected hierarchical porous structures, HP-Fe-N/CNFs display excellent ORR catalytic activity in alkaline media, with a comparable onset potential and half-wave potential but superior selectivity, stability, and tolerance against methanol to commercial 30 wt % Pt/C. Particularly, when applied in an assembled Zn-air battery, HP-Fe-N/CNFs outperform 30 wt % Pt/C in power density and long-term stability, explicitly showing their promising practical application.

ISSN No.:1944-8244

Translation or Not:no

Date of Publication:2017-05-17

Co-author:Zhao, Yingxuan,wy,Zhu, Junjie,lyz

Correspondence Author:Lai Qingxue