3D Hollow Flower-like CoWO 4 Derived from ZIF-67 Grown on Ni-foam for High-Performance Asymmetrical Supercapacitors

A three-dimensional (3D) hollow CoWO composite grown on Ni-foam (3D-H CoWO /NF) based on a flower-like metal-organic framework (MOF) is designed by utilizing a facile dipping and hydrothermal approach. The 3D-H CoWO /NF not only possesses large specific areas and rich active sites, but also accommod...

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Published in:Chemistry, an Asian journal an Asian journal, 2020-06, Vol.15 (11), p.1750-1755
Main Authors: Chu, Dawei, Guo, Dongxuan, Xiao, Boxin, Tan, Lichao, Ma, Huiyuan, Pang, Haijun, Wang, Xinming, Jiang, Yanxia
Format: Article
Language:English
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Summary:A three-dimensional (3D) hollow CoWO composite grown on Ni-foam (3D-H CoWO /NF) based on a flower-like metal-organic framework (MOF) is designed by utilizing a facile dipping and hydrothermal approach. The 3D-H CoWO /NF not only possesses large specific areas and rich active sites, but also accommodates volume expansion/contraction during charge/discharge processes. In addition, the unique structure facilitates fast electron/ion transport of 3D-H CoWO /NF. Meanwhile, a series of characterization measurements demonstrate the appropriate morphology and excellent electrochemical performance of the material. The 3D-H CoWO /NF possesses a high specific capacitance of 1395 F g , an excellent cycle stability with 89% retention after 3000 cycles and superior rate property. Furthermore, the 3D-H CoWO /NF can be used as a cathode to configurate an asymmetric supercapacitor (ASC), and 3D-H CoWO /NF//AC shows a good energy density (29.0 W h kg ). This work provides a facile method for the preparation of 3D-hollow electrode materials with high electrochemical capability for advanced energy storage devices.
ISSN:1861-4728
1861-471X
DOI:10.1002/asia.202000334