Highly efficient catalysts for oxygen reduction using well-dispersed iron carbide nanoparticles embedded in multichannel hollow nanofibers

Hongyin Xia, Shan Zhang, Xiaoqing Zhu, Huanhuan Xing, Yuan Xue, Bolong Huang (Corresponding Author), Mingzi Sun, Jing Li, Erkang Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)

Abstract

Engineering catalytic materials into appropriate structures to get the structural benefits is vital for harvesting unprecedented catalytic efficiency in the oxygen reduction reaction (ORR). Herein, well-dispersed and highly active iron carbide nanoparticles (Fe3C NPs) were encapsulated in multichannel hollow nanofibers (MHNFs) to construct Fe3C@MHNF catalysts, which were synthesizedviasimple electrospinning and calcination steps. The well-defined inner channels with high conductivity and a porous structure enable the rapid electron transfer and mass transport for the ORR. And the resulting hybrid electrocatalyst with Fe3C NPs serving as active sites exhibits highly efficient activity with a half-wave potential of 0.90 Vvs.the reversible hydrogen electrode (RHE), which surpasses that of the commercial platinum on carbon (Pt/C) catalyst (a half-wave potential of 0.84 Vvs.RHE). The catalyst shows robust durability with negligible activity decay after 10 000 cycles. Density functional theory calculations confirm that the introduction of MHNFs significantly improves the electron transfer and exchange capability. The formed interfacial region not only induces linear correlation in both electronic structures and binding energies but also alleviates the barrier of site-to-site electron transfer between Fe3C NPs and MHNFs for the ORR process.

Original languageEnglish
Pages (from-to)18125-18131
Number of pages7
JournalJournal of Materials Chemistry A
Volume8
Issue number35
DOIs
Publication statusPublished - 21 Sep 2020

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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