超级电容器
材料科学
假电容
氢氧化物
电容
电化学
阳极
阴极
碳纤维
化学工程
电流密度
复合材料
电极
储能
多孔性
复合数
化学
物理化学
工程类
功率(物理)
物理
量子力学
作者
Mei Yu,Ruili Liu,Jianhua Liu,Songmei Li,Yuhong Ma
出处
期刊:Small
[Wiley]
日期:2017-10-10
卷期号:13 (44)
被引量:141
标识
DOI:10.1002/smll.201702616
摘要
Abstract Polyhedral‐like NiMn‐layered double hydroxide/porous carbon (NiMn‐LDH/PC‐ x ) composites are successfully synthesized by hydrothermal method ( x = 1, 2 means different mass percent of porous carbon (PC) in composites). The NiMn‐LDH/PC‐1 composites possess specific capacitance 1634 F g −1 at a current density of 1 A g −1 , and it is much better than that of pure LDH (1095 F g −1 at 1 A g −1 ). Besides, the sample can retain 84.58% of original capacitance after 3000 cycles at 15 A g −1 . An asymmetric supercapacitor with NiMn‐LDH/PC‐1 as anode and activated carbon as cathode is fabricated, and the supercapacitor can achieve an energy density of 18.60 Wh kg −1 at a power density of 225.03 W kg −1 . The enhanced electrochemical performance attributes to the high faradaic pseudocapacitance of NiMn‐LDH, the introduction of PC, and the 3D porous structure of LDH/PC‐1 composites. The introduction of PC hinders serious agglomeration of LDH and further accelerates ions transport. The encouraging results indicate that these materials are one of the most potential candidates for energy storage devices.
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