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Research Article

Supersaturated bridge-sulfur and vanadium co-doped MoS2 nanosheet arrays with enhanced sodium storage capability

Yuru Dong1,§, Zhengju Zhu1,§, Yanjie Hu1( ), Guanjie He2, Yue Sun1, Qilin Cheng1, Ivan P. Parkin2, Hao Jiang1( )
Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China
Christopher Ingold Laboratory, Department of Chemistry, University College London, 20 Gordon Street, London WC1H0AJ, UK

§ Yuru Dong and Zhengju Zhu contributed equally to this work.

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Abstract

The low specific capacity and sluggish electrochemical reaction kinetics greatly block the development of sodium-ion batteries (SIBs). New high-performance electrode materials will enhance development and are urgently required for SIBs. Herein, we report the preparation of supersaturated bridge-sulfur and vanadium co-doped MoS2 nanosheet arrays on carbon cloth (denoted as V-MoS2+x/CC). The bridge-sulfur in MoS2 has been created as a new active site for greater Na+ storage. The vanadium doping increases the density of carriers and facilitates accelerated electron transfer. The synergistic dual-doping effects endow the V-MoS2+x/CC anodes with high sodium storage performance. The optimized V-MoS2.49/CC gives superhigh capacities of 370 and 214 mAh·g-1 at 0.1 and 10 A·g-1 within 0.4-3.0 V, respectively. After cycling 3,000 times at 2 A·g-1, almost 83% of the reversible capacity is maintained. The findings indicate that the electrochemical performances of metal sulfides can be further improved by edge-engineering and lattice-doping co-modification concept.

Keywords

MoS2sodium-ion batteryhigh specific capacitycycle lifebridge-sulfur

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Nano Research
Volume 14 Issue 1,
January 2021
Pages 74-80
DOI: 10.1007/s12274-020-3044-x
Cite this article:
Dong Y, Zhu Z, Hu Y, et al. Supersaturated bridge-sulfur and vanadium co-doped MoS2 nanosheet arrays with enhanced sodium storage capability. Nano Research, 2021, 14(1): 74-80. https://doi.org/10.1007/s12274-020-3044-x
Topics:
AnodesIon batteriesLayered semiconductorsMetal ionsMolybdenum compoundsNanosheetsSodiumStorage (materials)SulfurSulfur compoundsVanadium

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Received: 23 June 2020
Revised: 04 August 2020
Accepted: 07 August 2020
Published: 05 January 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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