期刊
APPLIED SURFACE SCIENCE
卷 528, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.146920
关键词
Hybrid supercapacitor; Metal organic framework; Ni/Co-based MOFs; Electrode materials; Low crystallinity
类别
资金
- National Natural Science Foundation of China [51362020, 21571095]
Metal organic framework (MOF)-based electrode materials, which could be rapidly synthesized in ambient environment with low cost but also provide a remarkable high-energy density, are ideal candidates for developing high-performance and cost-effective supercapacitors. Herein, a facile room-temperature solution-phase based method is employed for fast and large-scale synthesis of Ni/Co-based MOFs with low crystallinity, which surprisingly exhibit extraordinary charge storage capability. In particular, the Ni2Co-MOF shows the highest structure disorder and the smallest nanosheet feature size among these MOFs, offers a specific capacity of 2149 mC cm(-2) (or 1074.5 C g(-1)) at a discharge current of 1 mA cm(-2), and 1654 mC cm(-2) (or 827 C g(-1)) at 20 mA cm(-2). Moreover, with Ni2Co-MOF as the positive electrode and activated carbon as the negative electrode, hybrid supercapacitors operating at 1.6 V deliver superior energy densities of 66.1 and 41.3 W h kg(-1) at power densities of 800 and 8000 W kg(-1), respectively. The findings in this study provide a promising electrode material for high-performance supercapacitors, and possibly break a new path toward MOF material synthesis in a cost-effective way but with outstanding charge storage capability.
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