Journal
ACS NANO
Volume 13, Issue 5, Pages 5533-5540Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b00383
Keywords
zeolite-like framework; MoS2; Mo defect; hollow architecture; sodium-ion battery
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Funding
- National Key Research and Development Program of China [2018YFA0208600]
- NSFC [21425102]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
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Achieving a molecular level understanding of surface performance of nanomaterials by modulating the electronic structure is important but challenging. Here, we have developed a hollow microcube framework constructed by Mo-defect-rich ultrathin MoS2 nanosheets (HMF-MoS2) through a zeolite-like-framework-engaged strategy. The hollow structured HMF-MoS2 delivers an impressive specific capacity (384.3 mA h CI after 100 cycles at 100 mA g(-1)) and cycle stability (267 mA h g(-1) after 125 cycles at 1 A g(-1)) for sodium storage. As evidenced by experiments and density functional theory calculations, abundant Mo vacancies in MoS2 can greatly accelerate the charge transfer and enhance the interaction between MoS2 and sodium, resulting in the promotion of sodium storage. Kinetic analysis result reveals that the ultrafast sodium ion storage of HMF-MoS2 could be associated with the significant contribution of capacitive energy storage. This work highlights the detailed molecular level understanding of chemical reaction on MoS2 surface by defect and morphology engineering, which can be applied to other metal sulfides for energy storage devices.
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