超级电容器
材料科学
异质结
聚吡咯
电容
复合数
功率密度
碳纳米管
纳米技术
化学工程
电极
复合材料
光电子学
化学
功率(物理)
聚合物
工程类
物理化学
物理
量子力学
聚合
作者
Yayun Zheng,Jie Xu,Xiaohui Yang,Yingjiu Zhang,Yuanyuan Shang,Xiaoyang Hu
标识
DOI:10.1016/j.cej.2017.09.155
摘要
In this work, a unique [email protected]2S4 core-shell heterostructure material is prepared taking polypyrrole (Ppy) nanotubes as skeleton through a simple and environmentally friendly hydrothermal method. The heterostructured structure with Ppy nanotubes (NTs) as the core and intertwined flake-like NiCo2S4 as the outer shell, holds a large specific surface area (217 m2 g−1), convenient charge transport channel, high specific capacitance (908.1 F g−1 at a current density of 1 A g−1), and excellent cycling performance (87.7% of initial value is retained after 2000 cycles). What’s more, an asymmetric supercapacitor is fabricated by employing [email protected]2S4 core-shell heterostructured material as positive and nitrogen-doped carbon nanotubes (N-C NTs) as negative electrode. This [email protected]2S4//N-C asymmetric supercapacitor effectively provides a high energy density over 50.82 Wh kg−1 with a high power density of 160 W kg−1 and preeminent cyclic stability of 126.6% after 2000 cycles. Due to the introduction of one-dimensional flexible Ppy inner core, as-designed the core-shell heterostructure composite may be promising in the flexible energy storage devices.
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