材料科学
纳米线
阳极
X射线光电子能谱
化学工程
电化学
介电谱
循环伏安法
碳纤维
纳米技术
硒化物
镍
电极
硒
复合材料
化学
冶金
复合数
物理化学
工程类
作者
Xuming Yang,Jiaolong Zhang,Zhenguang Wang,Hongkang Wang,Zhi Chen,Denis Y. W. Yu,Andrey L. Rogach
出处
期刊:Small
[Wiley]
日期:2017-12-27
卷期号:14 (7)
被引量:89
标识
DOI:10.1002/smll.201702669
摘要
Abstract Carbon‐supported nickel selenide (Ni 0.85 Se/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 Ni 0.85 Se nanoplates on the outer surface of the carbon. Ni 0.85 Se/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 Ni 0.85 Se/C hollow nanowires exhibit greatly enhanced cycle stability and rate capability as compared to Ni 0.85 Se 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.
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