Tuning the Band Structure of MoS2via Co9 S8 @MoS2 Core-Shell Structure to Boost Catalytic Activity for Lithium-Sulfur Batteries

ACS Nano
Boyu LiBingshe Xu

Abstract

The introduction of a dual-functional interlayer into lithium-sulfur batteries (LSBs) provides many opportunities for restraining the "shuttle effect" and enhancing sluggish sulfur conversion kinetics. Tuning the band structure of the metal sulfide provides an opportunity to enhance its catalytic activity, which plays an important role in suppressing the "shuttle effect" of lithium polysulfides (LiPSs) in LSBs. Here were present a Co9S8@MoS2 core-shell heterostructure anchored to a carbon nanofiber (Co9S8@MoS2/CNF), developed as an interlayer for suppressing the shuttle effect of LiPSs. The fabricated composite heterostructure is determined to be an effective alternative material that combines the synergistic relationship between chemisorption and electrochemical catalysis. We find that the band structure of the MoS2 shell can be effectively tuned by the Co9S8 core and that the Co9S8@MoS2/CNF can capture the LiPSs, providing excellent catalytic ability to convert LiPSs into Li2S2, with subsequent transformation from Li2S2 to Li2S. Importantly, high capacities of 1002 and 986 mAh g-1 can be retained after 50 cycles with high-sulfur loadings of 6 and 10 mg cm-2. Our results highlight the design of an atomic-scale heterostructure ...Continue Reading

References

Apr 15, 1990·Physical Review. B, Condensed Matter·D Vanderbilt
Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
Dec 17, 2016·Advanced Science·Jianhua YanBingyun Li
Jun 20, 2017·Advanced Materials·Tao TaoYing Chen
May 18, 2018·ACS Applied Materials & Interfaces·Nana HuXifei Li
Feb 16, 2019·Journal of the American Chemical Society·Zhenzhen DuLi-Jun Wan

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Citations

Aug 20, 2021·ACS Applied Materials & Interfaces·Haikuo ZhangJinjin Li
Sep 9, 2021·Inorganic Chemistry·Akhil Mammoottil AbrahamVenkataraman Thangadurai
Sep 28, 2021·Materials Horizons·Xiang Long HuangZhiming M Wang
Nov 12, 2021·ACS Applied Materials & Interfaces·Guiping PengShengde Dong

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