Journal
SMALL
Volume 14, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201702669
Keywords
nickel selenide; selenium nanowires; self-templating; sodium ion batteries
Categories
Funding
- Research Grant Council of Hong Kong S.A.R. [CityU 21202014]
- CityU SRGproject [7004390]
Ask authors/readers for more resources
Carbon-supported nickel selenide (Ni0.85Se/C) hollow nanowires are prepared from carbon-coated selenium nanowires via a self-templating hydrothermal method, by first dissolving selenium in the Se/C nanowires in hydrazine, allowing it to diffuse out of the carbon layer, and then reacting with nickel ions into Ni0.85Se nanoplates on the outer surface of the carbon. Ni0.85Se/C hollow nanowires are employed as anode materials for sodium-ion batteries, and their electrochemical performance is evaluated via the cyclic voltammetry and electrochemical impedance spectroscopy combined with ex situ X-ray photoelectron spectroscopy and X-ray diffraction measurements. It is found that Ni0.85Se/C hollow nanowires exhibit greatly enhanced cycle stability and rate capability as compared to Ni0.85Se nanoparticles, with a reversible capacity around 390 mA h g(-1) (the theoretical capacity is 416 mA h g(-1)) at the rate of 0.2 C and 97% capacity retention after 100 cycles. When the current rate is raised to 5 C, they still deliver capacity of 219 mA h g(-1). The synthetic methodology introduced here is general and can easily be applied to building similar structures for other metal selenides in the future.
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