Chu Dawei, Guo Dongxuan, Xiao Boxin, Tan Lichao, Ma Huiyuan, Pang Haijun, Wang Xinming, Jiang Yanxia
School of Materials Science and Engineering College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin, 150040, China.
Key Laboratory of Superlight Material and Surface Technology Ministry of Education, Harbin Engineering University, Harbin, 150001, China.
Chem Asian J. 2020 Jun 2;15(11):1750-1755. doi: 10.1002/asia.202000334. Epub 2020 May 18.
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.
通过简便的浸渍和水热法，设计了一种基于花状金属有机框架（MOF）在泡沫镍上生长的三维（3D）中空CoWO复合材料（3D-H CoWO /NF）。3D-H CoWO /NF不仅具有大的比表面积和丰富的活性位点，而且在充放电过程中能适应体积膨胀/收缩。此外，独特的结构有利于3D-H CoWO /NF的快速电子/离子传输。同时，一系列表征测量证明了该材料具有合适的形貌和优异的电化学性能。3D-H CoWO /NF具有1395 F g 的高比电容、3000次循环后89%的保留率的优异循环稳定性和优异的倍率性能。此外，3D-H CoWO /NF可用作阴极来配置不对称超级电容器（ASC），3D-H CoWO /NF//AC显示出良好的能量密度（29.0 W h kg ）。这项工作为制备具有高电化学性能的3D中空电极材料用于先进储能装置提供了一种简便方法。
