Journal
NANOSCALE
Volume 10, Issue 23, Pages 11165-11175Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr02620c
Keywords
-
Categories
Funding
- HKSAR Innovation and Technology Commission (ITC) [ITS/160/14FP]
- General Research Fund (GRF) from the Research Grants Council (RGC) of Hong Kong [14209514, 14203715]
Ask authors/readers for more resources
Sodium-ion batteries and capacitors are considered as low-cost energy storage devices, compared to Li-ion counterparts. However, most anodes for sodium-ion devices show sluggish kinetics and poor structural stability caused by the large radius (1.02 angstrom) of Na+. One candidate anode is MoS2, a 2D atomic layered material with a large interlayer spacing of 6.2 angstrom, that can take up and release Na(+)via two working principles: a two-electron intercalation process and a four-electron conversion reaction. Herein, we report a facile method to synthesize a MoS2-amorphous carbon (MoS2-AC) nanocomposite and further study the effect of the two working principles on the structure, interphase, and charge storage properties of MoS2-AC. The two-electron intercalation reaction enables the MoS2-AC electrode to have a higher rate capability and superior stability than that via the four-electron Na+ conversion reaction. This favorable Na+ charge storage performance of MoS2-AC via the two-electron intercalation process is attributed to its pseudocapacitive behavior, a stable solid electrolyte interphase and robust stability of the structure, which enables us to fabricate a sodium-ion capacitor that can deliver high energy density at a high rate. This work underscores the potential importance of realizing fast Na+ charge storage via an intercalation process as a strategy for the fabrication of high-performance sodium-ion capacitors and batteries.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available