Abstract
HighlightsDoping and porosity generation were completed simultaneously.Metal–heteroatom-doped carbon nanofibers are flexible, porous, and well dispersed.Results include excellent oxygen reduction reaction and enhanced Zn–air battery performance.
Highlights
New energy technology has become an optimal solution for the energy crisis and environmental pollution caused by the rapid depletion of fossil resources [1, 2]
Zn/Co-zeolitic imidazole frameworks (ZIFs)/PAN nanofibers were fabricated via an electrospinning method
The elements of Zn, Co, and N of Zn/Co-ZIFs/PAN are mainly concentrated in the Zn/Co-ZIFs. These elements are distributed on the nanofiber matrix uniformly after carbonization (Fig. 2f), which proves that Zn/Co-ZIFs play the roles of both self-sacrificing templates and doping agents
Summary
New energy technology has become an optimal solution for the energy crisis and environmental pollution caused by the rapid depletion of fossil resources [1, 2]. The size of the prepared ZIF nanocrystals is ultra-small in their study, and additional metal ions (Co2+) were required for the electrospinning process Based on these studies, we investigated combining electrospun PAN nanofibers with just as-prepared Zn/Co-ZIFs in different contents, as a precursor for flexible, porous, and well-dispersed metal–heteroatom-doped carbon nanofiber catalysts. We report a facile approach to prepare well-dispersed metal (Zn/Co) and heteroatom (N) co-doped porous carbon nanofibers (Zn/Co–N@PCNFs) film based on electrospun Zn/Co-ZIFs/PAN nanofibers. Zn/Co-ZIF nanocrystals with a larger size (~ 900 nm) and different contents were loaded onto electrospun PAN nanofiber without any additional metal ions Such a facile method can yield a hierarchical porous structure but can achieve a good distribution of metal active sites in the porous carbon nanofibers, which is important for ORR. The suitability and durability of Zn/Co–N@ PCNFs-800 were tested as the oxygen cathode for primary and rechargeable Zn–air batteries, showing relatively good electrochemical properties
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