假电容
阳极
材料科学
静电纺丝
复合数
氮气
纳米纤维
化学工程
电化学
钠
离子
纳米技术
复合材料
化学
超级电容器
电极
有机化学
物理化学
冶金
聚合物
工程类
作者
Su Nie,Li Liu,Junfang Liu,Jianjun Xie,Yue Zhang,Jing Xia,Hanxiao Yan,Yiting Yuan,Xianyou Wang
出处
期刊:Nano-micro Letters
[Springer Science+Business Media]
日期:2018-10-01
卷期号:10 (4)
被引量:74
标识
DOI:10.1007/s40820-018-0225-1
摘要
Nitrogen-doped TiO2–C composite nanofibers (TiO2/N–C NFs) were manufactured by a convenient and green electrospinning technique in which urea acted as both the nitrogen source and a pore-forming agent. The TiO2/N–C NFs exhibit a large specific surface area (213.04 m2 g−1) and a suitable nitrogen content (5.37 wt%). The large specific surface area can increase the contribution of the extrinsic pseudocapacitance, which greatly enhances the rate capability. Further, the diffusion coefficient of sodium ions (DNa+) could be greatly improved by the incorporation of nitrogen atoms. Thus, the TiO2/N–C NFs display excellent electrochemical properties in Na-ion batteries. A TiO2/N–C NF anode delivers a high reversible discharge capacity of 265.8 mAh g−1 at 0.05 A g−1 and an outstanding long cycling performance even at a high current density (118.1 mAh g−1) with almost no capacity decay at 5 A g−1 over 2000 cycles. Therefore, this work sheds light on the application of TiO2-based materials in sodium-ion batteries.
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