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Fe/N-doped carbon nanofibers with Fe3O4/Fe2C nanocrystals enchased as electrocatalysts for efficient oxygen reduction reaction

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Abstract

Designing efficient non-noble metal catalysts with good oxygen reduction activity is highly desirable but challenging. Herein, we demonstrate the synthesis of Fe-based carbon materials with multi active sites of Fe–Nx, Fe3O4 and Fe2C for oxygen reduction through facile pyrolysis of a Fe–porphyrin conjugated microporous polymer. The nanofiber structure of the polymer is retained with in situ Fe and N heteroatom doping and Fe3O4/Fe2C composite nanocrystals enchased in the walls of carbon fibers. Synergism between the N-doped carbon nanofibers and the in situ formed active sites of Fe–Nx, Fe2C and Fe3O4 facilitates the electrocatalytic performance of the as-synthesized catalysts. The catalyst obtained from 800 °C pyrolysis exhibits prominent oxygen reduction catalytic performance in 0.1 M KOH with an onset potential of 0.91 V, a half-wave potential of 0.81 V, and a small Tafel slope of 74 mV dec−1. Its limiting current density of −5.3 mA cm−2, excellent durability and resistance to methanol surpass the commercial 20% Pt/C under identical conditions. Thus, this work may provide a guideline for the design and synthesis of multi active nonprecious metal electrocatalysts for future fuel–cell applications.

Graphical abstract: Fe/N-doped carbon nanofibers with Fe3O4/Fe2C nanocrystals enchased as electrocatalysts for efficient oxygen reduction reaction

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Publication details

The article was received on 15 May 2019, accepted on 15 Jul 2019 and first published on 17 Jul 2019


Article type: Research Article
DOI: 10.1039/C9QI00551J
Inorg. Chem. Front., 2019, Advance Article

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    Fe/N-doped carbon nanofibers with Fe3O4/Fe2C nanocrystals enchased as electrocatalysts for efficient oxygen reduction reaction

    M. Li, Z. Xiao, L. Fan, F. Wang, X. Du, Z. Kang, W. Fan, Z. Guo and D. Sun, Inorg. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QI00551J

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