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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Carbon Nanotubes-Graphene-Solidlike Ionic Liquid Layer-Based Hybrid Electrode Material for High Performance Supercapacitor
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Carbon Nanotubes-Graphene-Solidlike Ionic Liquid Layer-Based Hybrid Electrode Material for High Performance Supercapacitor

机译：用于高性能超级电容器的碳纳米管-石墨烯-固体离子液体层基混合电极材料

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摘要

Carbon nanomaterials are promissing electrode materials for supercapacitor applications due to their unique properties- Electrolyte accessibility is a big challenge in ionic liquid electrolyte-based supercapacitors with carbon nanomaterials as electrodes. In this study, an ultrahigh performance supercapacitor electrode, based on solidlike ionic liquid layer coated carbon nanotubes-hydrogen exfoliated graphene nanocomposite is demonstrated with hydrophobic ionic liquid as electrolyte. The presence of solidlike layers of ionic liquid is confirmed by structural and morphological analysis. The nanocomposite shows extremely high energy density (171 Wh/kg) and high specific capacitance (201 F/g) at a large specific current of 2 A/g, in terms of the mass of active electrode material, along with wide operating voltage (3.5 V). The Ragone fit shows that the time constant, maximum stored energy, and maximum available power are 0.575 s, 170.66 Wh/kg, and 148.43 kW/kg, respectively. The improvement in performance of the nanocomposite is mainly attributed to the presence of solidlike layers of ionic liquid on the surface of carbon nanomaterials, which effectively increases the electrolyte accessibility and number of shortest, directional ion transport paths. Here, carbon nanotubes play a role as a smart conductive spacer.
机译：碳纳米材料因其独特的性能而成为超级电容器应用的电极材料。在以碳纳米材料为电极的离子液体电解质基超级电容器中，电解质的可及性是一个巨大的挑战。在这项研究中，以疏水离子液体为电解质，证明了一种基于固态离子液体层涂覆的碳纳米管-氢剥落石墨烯纳米复合材料的超高性能超级电容器电极。通过结构和形态分析证实了离子液体的固体状层的存在。就活性电极材料的质量而言，纳米复合材料在2 A / g的大比电流下显示出极高的能量密度（171 Wh / kg）和高比电容（201 F / g），以及宽的工作电压（ 3.5 V）。 Ragone拟合显示时间常数，最大存储能量和最大可用功率分别为0.575 s，170.66 Wh / kg和148.43 kW / kg。纳米复合材料性能的提高主要归因于碳纳米材料表面上离子液体的固体层的存在，这有效地增加了电解质的可及性和最短的定向离子传输路径的数量。在此，碳纳米管起着智能导电间隔物的作用。

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