超级电容器
电容
材料科学
镍
化学工程
电化学
电极
钴
功率密度
碳纤维
热液循环
金属
电流密度
纳米技术
金属有机骨架
复合材料
冶金
化学
有机化学
功率(物理)
复合数
物理化学
吸附
工程类
物理
量子力学
作者
Shuwen Gao,Yanwei Sui,Fuxiang Wei,Jiqiu Qi,Qingkun Meng,Yaojian Ren,Yezeng He
标识
DOI:10.1016/j.jcis.2018.07.044
摘要
Metal-organic frameworks (MOFs), serving as a promising electrode material in the supercapacitors, have attracted tremendous interests in recent years. Here, through modifying the molar ratio of the Ni2+ and Co2+, we have successfully fabricated Ni-MOF and Ni/Co-MOF by a facile hydrothermal method. The Ni/Co-MOF with a dandelion-like hollow structure shows an excellent specific capacitance of 758 F g-1 at 1 A g-1 in the three-electrode system. Comparing with Ni-MOF, the obtained Ni/Co-MOF has a better rate capacitance (89% retention at 10 A g-1) and cycling life (75% retention after 5000 circulations). Besides, the assembled asymmetric supercapacitor based on Ni/Co-MOF and active carbon exhibits a high specific energy density of 20.9 W h kg-1 at the power density of 800 W kg-1. All these results demonstrate that the mixed-metal strategy is an effective way to optimize the morphology and improve the electrochemical property of the MOFs.
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