Journal
APPLIED SURFACE SCIENCE
Volume 481, Issue -, Pages 1352-1359Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.03.259
Keywords
Fe7S8/Fe3O4; Heterostructuring; Pseudocapacitance; Stepwise lithiation
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Funding
- National Natural Science Foundation of China [51871059, 51601040, 51571063]
- FDUROP (Fudan's Undergraduate Research Opportunities Program) [18415]
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The hexagonal sheet shaped Fe3O4/Fe7S8 heterojunction with lateral size of 1.5 mu m has been controllably synthesized by gas sulfuration process. The most fascinating performance of this Fe3O4/Fe7S8 heterojunction structure is that the capacity attenuation is rather small of only 18%, from 818 mAh.g(-1) to 670 mAh.g(-1), when the current density increases ten-fold from 0.2 A.g(-1) to 2.0 A.g(-1). This high capacity retention upon current density shifting, is attributed to pseudocapacitance contribution, which is related to the two-dimensional hexagonal structure, faster electron/ion transfer and synergistic effect for the stepwise lithiation of Fe3O4 and Fe7S8 at different voltage in Fe3O4/Fe7S8 heterojunction. This rational design on heterojunction structure sheds light on further constructing novel anode material for secondary ion batteries.
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