Carbon-Supported Nickel Selenide Hollow Nanowires as Advanced Anode Materials for Sodium-Ion Batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Detail(s)

Original languageEnglish
Article number1702669
Journal / PublicationSmall
Volume14
Issue number7
Early online date27 Dec 2017
Publication statusPublished - 15 Feb 2018

Abstract

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.

Research Area(s)

  • nickel selenide, selenium nanowires, self-templating, sodium ion batteries