Dandelion-like nickel/cobalt metal-organic framework based electrode materials for high performance supercapacitors

被引:345
作者
Gao, Shuwen [1 ]
Sui, Yanwei [1 ]
Wei, Fuxiang [1 ]
Qi, Jiqiu [1 ]
Meng, Qingkun [1 ]
Ren, Yaojian [1 ]
He, Yezeng [1 ]
机构
[1] China Univ Min & Technol, Sch Mat Sci & Engn, Xuzhou 221116, Jiangsu, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Ni-MOF; Ni/Co-MOF; Supercapacitors; ZEOLITIC IMIDAZOLATE FRAMEWORK; ELECTROCHEMICAL ENERGY-STORAGE; PSEUDO-CAPACITIVE MATERIAL; FACILE SYNTHESIS; NI-MOF; POROUS CARBON; BATTERY-SUPERCAPACITOR; OXIDE; COMPOSITE; FABRICATION;
D O I
10.1016/j.jcis.2018.07.044
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
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. (C) 2018 Elsevier Inc. All rights reserved.
引用
收藏
页码:83 / 90
页数:8
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