Journal
ENERGY TECHNOLOGY
Volume 7, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201800790
Keywords
electrospinning; Fe-N; porous carbon materials; zeolitic imidazolate framework; Zn-air batteries
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Funding
- Shanghai Municipal Natural Science Foundation [17ZR1432200]
- National Natural Science Foundation of China [21774095]
- Tongji University
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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.
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