3D Hollow Flower‐like CoWO4 Derived from ZIF‐67 Grown on Ni‐foam for High‐Performance Asymmetrical Supercapacitors. Issue 11 (18th May 2020)

• Record Type: Journal Article
• Authors: Chu, Dawei; Guo, Dongxuan; Xiao, Boxin; Tan, Lichao; Ma, Huiyuan; Pang, Haijun; Wang, Xinming; Jiang, Yanxia
• Is Part Of: Chemistry, an Asian journal. Volume 15:Issue 11(2020)
• Page Start: 1750
• Page End: 1755
• Publication Date: 2020-05-18
• Subjects: 3D-Hollow structure -- MOF -- Flower-like CoWO4 -- Supercapacitor; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.202000334
• Languages: English
• ISSNs: 1861-4728

Abstract

Abstract: A three‐dimensional (3D) hollow CoWO4 composite grown on Ni‐foam (3D−H CoWO4 /NF) based on a flower‐like metal‐organic framework (MOF) is designed by utilizing a facile dipping and hydrothermal approach. The 3D−H CoWO4 /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 CoWO4 /NF. Meanwhile, a series of characterization measurements demonstrate the appropriate morphology and excellent electrochemical performance of the material. The 3D−H CoWO4 /NF possesses a high specific capacitance of 1395 F g −1, an excellent cycle stability with 89% retention after 3000 cycles and superior rate property. Furthermore, the 3D−H CoWO4 /NF can be used as a cathode to configurate an asymmetric supercapacitor (ASC), and 3D−H CoWO4 /NF//AC shows a good energy density (29.0 W h kg −1 ). This work provides a facile method for the preparation of 3D‐hollow electrode materials with high electrochemical capability for advanced energy storage devices. Abstract : A 3D hollow flower‐like CoWO4 composite grown on Ni‐foam (3D−H CoWO4 /NF) has been engineered by a facile dipping and hydrothermal approach. The material possesses a high specific capacitance of 1395 F g −1 and excellent capacitance retention of 89% after 3000 cycles. Furthermore, the 3D−H CoWO4 /NF//AC has an good energy density (29.0 W h kg −1 at 404 W kg −1 ).