超级电容器
碳化
氧化钴
材料科学
碳纤维
氧化石墨
石墨
化学工程
电容
氧化物
电极
复合材料
沸石咪唑盐骨架
钴
有机化学
化学
复合数
金属有机骨架
吸附
冶金
扫描电子显微镜
物理化学
工程类
作者
Tzu-Yang Chen,Tsung‐Rong Kuo,Sibidou Yougbaré,Lu‐Yin Lin,Cheng-Yu Xiao
标识
DOI:10.1016/j.jcis.2021.09.198
摘要
Zeolitic imidazolate framework-67 (ZIF67) derivatives are considered as promising active materials for energy storage owing to the possible formation of cobalt oxide and N-doped graphite. Cobalt oxide has multiple redox states for generating redox reactions for charge storage, while N-doped graphite can provide high electrical conductivity for charge transfer. In this study, it is the first time to synthesize binder-free electrodes composed of cobalt oxide and N-doped graphite derived from ZIF67 on carbon cloth (CC) for supercapacitor (SC). Successive oxidation and carbonization along with additional coverage of ZIF67 derivatives are applied to synthesize ZIF67 derivatives composed of cobalt oxide, N-doped graphite and cobalt oxide/N-doped graphite composites with different layer compositions. The highest specific capacitance (CF) of 90.0F/g at 20 mV/s is obtained for the oxidized ZIF67/carbonized ZIF67/carbon cloth (O67/C67/CC) electrode, due to the large surface area and high electrical conductivity benefitted from preferable morphology and growing sequence of Co3O4 and N-doped graphite. The symmetric SC composed of O67/C67/CC electrodes shows the maximum energy density of 2.53 Wh/kg at the power density of 50 W/kg. Cycling stability with CF retention of 70% and Coulombic efficiency of 65% after 6000 times repeatedly charge/discharge process is also obtained for this symmetric SC.
科研通智能强力驱动
Strongly Powered by AbleSci AI