期刊
NANO ENERGY
卷 22, 期 -, 页码 27-37出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.02.009
关键词
MoS2; Interface engineering; Monolayers; Nanotubes; Sodium-ion batteries
类别
资金
- National Natural Science Foundation of China (NSFC) [21301044, 51272217]
- Fundamental Research Funds for the Central Universities [2014HGCH0013]
- CityU Applied Research Grant [9667107]
Interface engineering on 2D layered nanomaterials plays pivotal roles in achieving novel properties and superior device performance. In this work, hierarchical nanotubes consisting of 2D monolayer MoS2 and carbon (MoS2:C) interoverlapped superstructure nanosheets have been synthesized, in which the MoS2 and carbon layers are alternately sandwiched. The hierarchical architectures assembled from the MoS2:C superstructures are beneficial for: (i) providing substantially expanded (002) interlayer spacing (0.98 nm) of 2H-MoS2 which facilitates fast Na+ insertion/extraction reaction kinetics, (ii) improving electrical conductivity of MoS2 by carbon monolayer insertion with ideal heterointerface contact, (iii) preventing aggregation of MoS2 nanosheets, and (iv) accommodating volume change upon sodiation/desodiation. The superstructure nanotubes are demonstrated as a robust anode material for sodium storage with superior electrochemical performance. They deliver a high rate-capability and maintain discharge capacities of 295 and 187 mAh g(-1) at high current densities of 10.0 and 20.0 A g(-1), respectively. Furthermore, they show durable cycling life (capacity retention of 101.3%, 108.2% and 107.8% after 200 cycles at current densities of 0.2, 0.5 and 1.0 A g(-1), respectively, in comparison to those of the 2nd cycles), and an initial Coulombic efficiency as high as 84%. The MoS2:C superstructure nanotubes perform among the best of current MoS2-based electrode materials. (C) 2016 Elsevier Ltd. All rights reserved.
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