电容
超级电容器
偏苯三甲酸
电化学
材料科学
储能
化学工程
电化学储能
功率密度
扩散
电极
纳米技术
化学
功率(物理)
有机化学
物理
工程类
物理化学
热力学
量子力学
分子
作者
Haiyang Zhang,Jie Li,Zhiqiang Li,Yuwen Song,Siyan Zhu,Junchuan Wang,Ying Sun,Xueqin Zhang,Baoping Lin
标识
DOI:10.1016/j.jpcs.2021.110336
摘要
The direct use of the original metal-organic framework (MOF) as an electrode material can reduce energy consumption and save costs during the commercialization of MOF-based energy storage materials. In this work, three kinds of ammonium solutions with different anions are introduced in the synthesis process and three forms of Co-based MOFs with different appearances are obtained: Co-BTC block, where BTC is trimesic acid; Co-BTC block microspheres; and Co-BTC nanoblock microspheres (CTNBMs). The CTNBMs have the highest specific capacitance among the three, which reveals that the nanonization of MOFs can effectively improve their energy storage performance. The CTNBMs exhibit a specific capacitance of 427.8 F g−1 at 0.5 A g−1 with a capacitance retention of 73.5% at 10 A g−1. The energy storage mechanism shows that CTNBMs are affected mainly by diffusion control during the electrochemical process. Cyclic stability measurements demonstrate that the capacitance retention of CTNBMs after 3000 cycles at 8 A g−1 is 85.9%, which is the best of the three as-prepared materials. In addition, the assembled CTNBM//activated carbon asymmetric supercapacitor device has a maximum energy density of 30.6 W h kg−1 at a power density of 349.7 W kg−1.
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