Interface engineering of Fe3Se4/FeSe heterostructure encapsulated in electrospun carbon nanofibers for fast and robust sodium storage

Jiawei LIU, Shuhao XIAO, Xinyan LI, Zhenzhe LI, Xinran LI, Wensi ZHANG, Yong XIANG, Xiaobin NIU*, Jun Song CHEN

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

78 Citations (Scopus)

Abstract

Looking for high-performance anode materials for the emerging sodium-ion batteries is an important topic for the research community. Even though iron selenides are promising candidates owning to their high theoretical capacities, they suffer from poor cycle life and inferior high-rate performance because of the conversion reaction during cycling and sluggish Na diffusion kinetics. In this work, we construct a Fe3Se4/FeSe heterostructure wrapped inside carbon nanofibers. When served as the anode material for sodium-ion batteries, the as-prepared sample presents a high capacity of 417.4 mAh g−1 at 0.5 A g−1 and a superior capacity retention of 89.1% after 1000 cycles at 5 A g−1, outperforming the heterostructure-free counterpart of Fe3Se4@NCNF and many other FeSe-based anodes. Density Functional Theory calculation suggests that the Fe3Se4/FeSe interface would significantly improve the electronic conductivity, Na+ diffusion as well as structural stability of the electrode material.

Original languageEnglish
Article number129279
Number of pages9
JournalChemical Engineering Journal
Volume417
Early online date11 Mar 2021
DOIs
Publication statusPublished - 1 Aug 2021
Externally publishedYes

Bibliographical note

This work was financially supported by Fundamental Research Funds for the Central Universities, China (No. ZYGX2019J030) and by the National Natural Science Foundation of China (No. 11974004).

Keywords

  • Carbon nanofibers
  • Density Functional Theory
  • FeSe/FeSe
  • Heterostructure
  • Sodium storage

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