材料科学
超级电容器
纳米管
纳米线
纳米结构
电极
电容
化学工程
离子
多孔性
离子交换
制作
纳米技术
碳纳米管
复合材料
物理化学
化学
工程类
物理
量子力学
医学
替代医学
病理
作者
Juan Wu,Xiling Shi,Weijie Song,Hua Ren,Changbin Tan,Shaochun Tang,Xiangkang Meng
出处
期刊:Nano Energy
[Elsevier]
日期:2018-01-17
卷期号:45: 439-447
被引量:122
标识
DOI:10.1016/j.nanoen.2018.01.024
摘要
We report a significant advance in the design and fabrication of MCo2S4 (M = Ni, Fe, Zn) complex hierarchical structures with well-defined morphologies by achieving novel hierarchically porous hexagonal microsheets constructed by well-interwoven nanotube networks using a controllable two-step anion-exchange technique. Uniform and smooth hexagonal sheets are initially achieved for the first anion-exchange leading to nanowire-woven hexagons, followed by transformation of each nanowire to rough MCo2S4 nanotube via the second anion-exchange. The involved mechanism of this general top-down method allowing fine nanostructure control is clarified based on our proposed new insights into ion-induced anisotropic growth and time-dependent anion-exchange reaction kinetics. The merits of both maximized porosity and low resistance facilitate fast electron transfer/ion diffusion, thus NiCo2S4 electrode material exhibits a higher specific capacitance of 1780 F g−1 and superior rate capability than most reported NiCo2S4 nanostructures with different morphologies as well as excellent stability (92.4% capacity retention after 10,000 cycles at 10 A g−1). Furthermore, an asymmetric solid-state supercapacitor using such NiCo2S4 as positive and N-doped graphene film as negative electrodes achieves outstanding cycle ability (92.1% retention over 5000 cycles at 20 A g−1) and higher energy density of 67.2 W h kg−1 (at 900 W kg−1) than that of similar devices. Such MCo2S4 electrode materials are promising for the future generation of high performance supercapacitors.
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