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首页> 外文期刊>Chemical engineering journal >Dilute NiO/carbon nanofiber composites derived from metal organic framework fibers as electrode materials for supercapacitors
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Dilute NiO/carbon nanofiber composites derived from metal organic framework fibers as electrode materials for supercapacitors

机译：源自金属有机骨架纤维的稀NiO /碳纳米纤维复合材料作为超级电容器的电极材料

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摘要

A new type of carbon nanofiber (CNF) dominated electrode materials decorated with dilute NiO particles (NiO/CNF) has been in situ fabricated by direct pyrolysis of Ni, Zn-containing metal organic framework fibers, which are skillfully constructed by assembling different proportional NiCl2.6H(2)O and Zn (Ac)(2).2H(2)O with trimesic acid in the presence of N,N-dimethylformamide. With elegant combination of advantages of CNF and evenly dispersed NiO particles, as well as successful modulation of conductivity and,porosity of final composites, our NiO/CNF composites display well-defined capacitive features. A high capacitance of 14,926 F g(-1) was obtained in 6 M KOH electrolyte when the contribution from 0.43 wt% NiO was considered alone, contributing to over 35% of the total capacitance (234 F g(-1)). This significantly exceeds its theoretical specific capacitance of 2584 F g(-1). It has been established from the Ragone plot that a largest energy density of 33.4 Wh kg(-1) was obtained at the current density of 0.25 A g(-1). Furthermore, such composite electrode materials show good rate capability and outstanding cycling stability up to 5000 times (only 10% loss). The present study provides a brand-new approach to design a high capacitance and stable supercapacitor electrode and the concept is extendable to other composite materials. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过直接热解含锌，含锌的金属有机骨架纤维，通过组装不同比例的NiCl2巧妙地构建了一种新型的用稀NiO颗粒（NiO / CNF）装饰的新型碳纳米纤维（CNF）为主的电极材料。在N，N-二甲基甲酰胺存在下，用偏苯三酸.6H（2）O和Zn（Ac）（2）.2H（2）O。通过将CNF和均匀分散的NiO颗粒的优点完美地结合在一起，以及成功地调节最终复合材料的电导率和孔隙率，我们的NiO / CNF复合材料显示出明确的电容特性。当单独考虑来自0.43 wt％NiO的贡献时，在6 M KOH电解质中可获得14,926 F g（-1）的高电容，占总电容（234 F g（-1））的35％以上。这大大超过了其理论比电容2584 F g（-1）。从Ragone图可以确定，在0.25 A g（-1）的电流密度下，最大能量密度为33.4 Wh kg（-1）。此外，这种复合电极材料显示出良好的速率能力和高达5000次的出色循环稳定性（损耗仅为10％）。本研究提供了一种全新的方法来设计高电容和稳定的超级电容器电极，并且该概念可扩展到其他复合材料。 （C）2016 Elsevier B.V.保留所有权利。

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