超级电容器
硫化钴
材料科学
硫化镍
煅烧
氧化钴
双金属片
镍
钴
化学工程
电化学
氧化镍
硫化物
功率密度
复合数
氧化物
储能
纳米技术
电极
复合材料
催化作用
冶金
化学
功率(物理)
金属
物理化学
工程类
物理
量子力学
生物化学
作者
Lixiang Xie,Mingjie Li,Peng Zhu,Xianbin Xiao,Zhengfeng Jia,Zhiqiang Wei,Jinlong Jiang
标识
DOI:10.1016/j.jallcom.2021.162861
摘要
As inspired by the surging demand for high performance energy storage systems, researchers have been designing and exploring advanced electrode materials exhibiting higher energy and power densities. In this study, a novel combination of nickel-cobalt sulfide and oxide was reported for high performance supercapacitors. The porous α-Ni(Co)[email protected]2 composites with core–shell structure were derived from the well-designed precursor with Ni2CoS4 and ZIF-67 serving as the self-sacrificing templates through a two-step calcination process at elevated temperatures. Such a heterostructure exhibited an ultra-high specific capacity of 502.4 mA h g–1 at a current density of 1 A g–1, which was attributed to the unique porous core–shell structure and the ingenious combination of bimetallic sulfide and oxide. Furthermore, a hybrid supercapacitor based on the α-Ni(Co)[email protected]2 composite and commercial activated carbon achieved a high energy density of 82.4 Wh kg–1 at a power density of 847.5 W kg–1. The prominent electrochemical performance exhibited by the α-Ni(Co)[email protected]2 heterostructure in this study was demonstrated to be promising to practically serve as advanced electrode materials in supercapacitors.
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