超级电容器
石墨烯
材料科学
电容
电极
功率密度
纳米技术
电化学
储能
多孔性
化学工程
光电子学
复合材料
功率(物理)
量子力学
物理
工程类
物理化学
化学
作者
Jun Yan,Zhuangjun Fan,Wei Sun,Ning Gao,Tong Wei,Qiang Zhang,Fei Wei,Linjie Zhi
标识
DOI:10.1002/adfm.201102839
摘要
Abstract Hierarchical flowerlike nickel hydroxide decorated on graphene sheets has been prepared by a facile and cost‐effective microwave‐assisted method. In order to achieve high energy and power densities, a high‐voltage asymmetric supercapacitor is successfully fabricated using Ni(OH) 2 /graphene and porous graphene as the positive and negative electrodes, respectively. Because of their unique structure, both of these materials exhibit excellent electrochemical performances. The optimized asymmetric supercapacitor could be cycled reversibly in the high‐voltage region of 0–1.6 V and displays intriguing performances with a maximum specific capacitance of 218.4 F g −1 and high energy density of 77.8 Wh kg −1 . Furthermore, the Ni(OH) 2 /graphene//porous graphene supercapacitor device exhibits an excellent long cycle life along with 94.3% specific capacitance retained after 3000 cycles. These fascinating performances can be attributed to the high capacitance and the positive synergistic effects of the two electrodes. The impressive results presented here may pave the way for promising applications in high energy density storage systems.
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