Author(s) Yang, X.; Zhang, J.; Wang, Z.; Wang, H.; Zhi, C.; Yu, D.Y.W.; Rogach, A.L.
Journal Small
Date Published 2018 Feb

Carbon-supported nickel selenide (NiSe/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 NiSe nanoplates on the outer surface of the carbon. NiSe/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 NiSe/C hollow nanowires exhibit greatly enhanced cycle stability and rate capability as compared to NiSe nanoparticles, with a reversible capacity around 390 mA h g(the theoretical capacity is 416 mA h g) 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. The synthetic methodology introduced here is general and can easily be applied to building similar structures for other metal selenides in the future.

DOI 10.1002/smll.201702669
ISSN 1613-6829
Citation Small. 2018;14(7).

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