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Carbon‐Supported Nickel Selenide Hollow Nanowires as Advanced Anode Materials for Sodium‐Ion Batteries
Small ( IF 13.0 ) Pub Date : 2017-12-27 , DOI: 10.1002/smll.201702669 Xuming Yang 1 , Jiaolong Zhang 2 , Zhenguang Wang 1 , Hongkang Wang 3 , Chunyi Zhi 4 , Denis Y. W. Yu 2 , Andrey L. Rogach 1
Small ( IF 13.0 ) Pub Date : 2017-12-27 , DOI: 10.1002/smll.201702669 Xuming Yang 1 , Jiaolong Zhang 2 , Zhenguang Wang 1 , Hongkang Wang 3 , Chunyi Zhi 4 , Denis Y. W. Yu 2 , Andrey L. Rogach 1
Affiliation
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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.
中文翻译：
碳支持的硒化镍空心纳米线作为钠离子电池的高级阳极材料
碳载硒化镍镍（Ni 0.85 Se / C）空心纳米线是通过自模板水热法由碳包覆的硒纳米线制备的，首先将硒溶解在肼中的Se / C纳米线中，然后使其扩散出肼。碳层，然后与镍离子反应成碳外表面上的Ni 0.85 Se纳米板。Ni 0.85 Se / C空心纳米线被用作钠离子电池的负极材料，其电化学性能通过循环伏安法和电化学阻抗谱结合非原位X射线光电子能谱和X射线衍射测量进行评估。发现Ni 0.85与Ni 0.85 Se纳米粒子相比，Se / C空心纳米线表现出大大增强的循环稳定性和倍率性能，在0.2 C和97的速率下可逆容量约为390 mA hg -1（理论容量为416 mA hg -1）。 100个循环后的容量保留百分比。当电流速率升至5 C时，它们仍可提供219 mA hg -1的容量。这里介绍的合成方法是通用的，将来可以轻松地用于构建其他金属硒化物的类似结构。
更新日期：2017-12-27
中文翻译：
碳支持的硒化镍空心纳米线作为钠离子电池的高级阳极材料
碳载硒化镍镍（Ni 0.85 Se / C）空心纳米线是通过自模板水热法由碳包覆的硒纳米线制备的，首先将硒溶解在肼中的Se / C纳米线中，然后使其扩散出肼。碳层，然后与镍离子反应成碳外表面上的Ni 0.85 Se纳米板。Ni 0.85 Se / C空心纳米线被用作钠离子电池的负极材料，其电化学性能通过循环伏安法和电化学阻抗谱结合非原位X射线光电子能谱和X射线衍射测量进行评估。发现Ni 0.85与Ni 0.85 Se纳米粒子相比，Se / C空心纳米线表现出大大增强的循环稳定性和倍率性能，在0.2 C和97的速率下可逆容量约为390 mA hg -1（理论容量为416 mA hg -1）。 100个循环后的容量保留百分比。当电流速率升至5 C时，它们仍可提供219 mA hg -1的容量。这里介绍的合成方法是通用的，将来可以轻松地用于构建其他金属硒化物的类似结构。
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