Conversion of 1T-MoSe2 to 2H-MoS2 : XSe2-2 x mesoporous nanospheres for superior sodium storage performance

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Junjun Zhang
  • Wenpei Kang
  • Miao Jiang
  • Yu You
  • Yulin Cao
  • Tsz-Wai Ng
  • Denis Y. W. Yu
  • Jun Xu

Detail(s)

Original languageEnglish
Pages (from-to)1484-1490
Journal / PublicationNanoscale
Volume9
Issue number4
Publication statusPublished - 28 Jan 2017

Abstract

S-Doped 2H-MoSe2 (i.e., 2H-MoS2xSe2-2x) mesoporous nanospheres assembled from several-layered nanosheets are synthesized by sulfurizing freshly-prepared 1T-MoSe2 nanospheres, and they serve as a robust host material for sodium storage. The sulfuration treatment is found to be beneficial for removing surface/interface insulating organic contaminants and converting the 1T phase to the 2H phase with improved crystallinity and electrical conductivity. These result in significantly enhanced sodium storage performance, including charge/discharge capacity, first Coulombic efficiency, cycling stability, and rate capability. Coupled with benefits from in situ carbon modification and its mesoporous morphology, the 2H-MoS2xSe2-2x (x = 0.22) nanosphere anode can maintain a reversible capacity of 407 mA h g-1 after 100 cycles with no observable capacity fading at a high current density of 2.0 A g-1. This value is much higher than those of the anode fabricated with the freshly-prepared 1T-MoSe2 (95 mA h g-1) and the annealed 2H-MoSe2 (144 mA h g-1) samples. As the current density rises from 0.05 to 5.0 A g-1 (100-fold increase), the discharge capacity retention is significantly increased from 39% before sulfuration to 65% after sulfuration. This superior electrochemical performance of the 2H-MoS2xSe2-2x electrode suggests a promising way to design advanced sodium host materials by surface/interface engineering.

Citation Format(s)

Conversion of 1T-MoSe2 to 2H-MoS2: XSe2-2 x mesoporous nanospheres for superior sodium storage performance. / Zhang, Junjun; Kang, Wenpei; Jiang, Miao et al.
In: Nanoscale, Vol. 9, No. 4, 28.01.2017, p. 1484-1490.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review