Unraveling the Na-ion storage performance of a vertically aligned interlayer-expanded two-dimensional MoS2@C@MoS2 heterostructure

Achieving hierarchically uniform surface manipulated nanostructured materials is important to accomplish high performance storage devices, but it is still challenging. Herein, we successfully synthesized a vertically-aligned interlayer-expanded caterpillar-like heterostructure consisting of MoS2@C n...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (42), p.24557-24568
Main Authors: Veerasubramani, Ganesh Kumar, Park, Myung-Soo, Nagaraju, Goli, Dong-Won, Kim
Format: Article
Language:English
Subjects:
Anodes
Batteries
Diffusion rate
Electrochemical analysis
Electrochemistry
Electrode materials
Electrodes
Electron transport
Heterostructures
Interlayers
Ion diffusion
Ion exchange
Ion storage
Molybdenum disulfide
Molybdenum oxides
Molybdenum trioxide
Nanorods
Nanostructured materials
Rechargeable batteries
Sodium
Sodium-ion batteries
Specific capacity
Storage
Sulfurization
Vapor phases
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Summary:Achieving hierarchically uniform surface manipulated nanostructured materials is important to accomplish high performance storage devices, but it is still challenging. Herein, we successfully synthesized a vertically-aligned interlayer-expanded caterpillar-like heterostructure consisting of MoS2@C nanosheets (NSs) over MoS2 nanorods (NRs) (MoS2@C@MoS2) as an advanced anode material for sodium-ion batteries (SIBs). Step-wise ramp rate tuned MoS2 nanorods (NRs) were achieved via surface sulfurization of MoO3 NRs by a vapor phase ion-exchange method. Heterointerphased MoS2@C nanosheets performed a crucial role in enacting an excellent electrochemical performance by facilitating better Na+ ion diffusion and faster electron transport. The hierarchical MoS2@C@MoS2 electrode delivered a high specific capacity of 434 mA h g−1 (after 100 cycles at 100 mA g−1) and excellent cycling stability (352 mA h g−1 after 200 cycles at 1000 mA g−1). Kinetic analysis revealed that an enhanced sodium storage performance of the MoS2@C@MoS2 electrode could be accompanied by an ameliorated capacitive contribution reaction. Moreover, the sodium-ion full cell assembled with the MoS2@C@MoS2 anode and a Na3V2(PO4)2F3 cathode exhibited a high specific capacity of 320 mA h g−1 with good capacity retention.
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta08839c