Issue 4, 2017

Conversion of 1T-MoSe2 to 2H-MoS2xSe2−2x mesoporous nanospheres for superior sodium storage performance

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.

Graphical abstract: Conversion of 1T-MoSe2 to 2H-MoS2xSe2−2x mesoporous nanospheres for superior sodium storage performance

Supplementary files

Article information

Article type
Paper
Submitted
25 Nov 2016
Accepted
15 Dec 2016
First published
23 Dec 2016

Nanoscale, 2017,9, 1484-1490

Conversion of 1T-MoSe2 to 2H-MoS2xSe2−2x mesoporous nanospheres for superior sodium storage performance

J. Zhang, W. Kang, M. Jiang, Y. You, Y. Cao, T. Ng, D. Y. W. Yu, C. Lee and J. Xu, Nanoscale, 2017, 9, 1484 DOI: 10.1039/C6NR09166K

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