材料科学
超级电容器
锰
纳米线
壳体(结构)
纳米技术
能量密度
聚合物
化学工程
电极
电化学
复合材料
工程物理
冶金
物理化学
化学
工程类
作者
Weidong He,Chenggang Wang,Fuwei Zhuge,Xiaolong Deng,Xijin Xu,Tianyou Zhai
出处
期刊:Nano Energy
[Elsevier]
日期:2017-05-01
卷期号:35: 242-250
被引量:217
标识
DOI:10.1016/j.nanoen.2017.03.045
摘要
Abstract Hierarchically porous polypyrrole nanowires/manganese oxides nanoflakes (MnO 2 NFs@PPy NWs) core/shell nanostructures were successfully constructed through a simple, convenient and environmentally friendly method by using PPy nanowires as the core buffer and K-Birnessite type MnO 2 as the shell. The core/shell nanostructures effectively increase active surface areas and decrease the ion transmission distance, which is conducive to the efficient transfer of ions. The MnO 2 NFs@PPy NWs core/shell nanostructures exhibited not only high specific capacitance (276 F g −1 at 2 A g −1 ) but also excellent capacitance retained ratio of 72.5% under extreme charge/discharge conditions (200 F g −1 at 20 A g −1 ) due to the synergistic effect by combining the merits of MnO 2 and PPy. Using such hierarchical nanostructure as the positive electrode, we further demonstrate that ultra-flexible asymmetrical supercapacitors (AFSCs) (MnO 2 @PPy//AC) possess excellent cycling stability (90.3% after 6000 cycles at 3 A g −1 ), mechanical flexibility, large voltage operation window (1.8–2.0 V vs. SCE) and high energy densities at all charge/discharge conditions (25.8 W h kg −1 at the power density of 901.7 W kg −1 , and 17.1 W h kg −1 at the power density of 9000 W kg −1 , respectively).
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