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Freestanding 1D Hierarchical Porous Fe‐N‐Doped Carbon Nanofibers as Efficient Oxygen Reduction Catalysts for Zn–Air Batteries
Author(s) -
Wu Mengchen,
Li Congling,
Liu Rui
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201800790
Subject(s) - materials science , catalysis , carbonization , chemical engineering , carbon nanofiber , nanofiber , porosity , carbon fibers , current density , nanotechnology , specific surface area , doping , inorganic chemistry , carbon nanotube , composite material , chemistry , scanning electron microscope , optoelectronics , organic chemistry , physics , quantum mechanics , composite number , engineering
High‐performance nonprecious metal‐doped 1D carbon catalysts for oxygen reduction reactions (ORR) are viable candidates in lieu of platinum‐based catalysts. Hierarchical porous Fe‐N‐doped carbon nanofibers (Fe‐NHCFs) are fabricated via carbonization of MOF nanofibers with a specific surface area of 294 m 2 g −1 and inherent hierarchical porosity. Benefiting from the Fe‐N doping‐induced active sites, unique hierarchical porosity, and 1D honeycomb conductive networks to facilitate electron transfer, the freestanding Fe‐NHCFs confer a current density (5.2 mA cm −2 ) at 0.70 V (vs reversible hydrogen electrode), comparable with the commercial 20 wt% Pt/C (5 mA cm −2 ) in alkaline medium. Especially, the parallel characteristics with Pt/C is acquired in an assembled Zn–air battery, which deliver a discharge current density of 90 mA cm −2 and an output peak power density of 61 mW cm −2 . This simple synthesis strategy would leverage a new geometry for tailored utility of active sites for ORR in a 1D carbon framework.