MXene 涂层碳纳米纤维电极的超级电容器性能

C Pub Date : 2024-03-29 DOI:10.3390/c10020032
Seon Kyung Kim, Seung Ah Kim, Yoon Soo Han, Kyung-Hye Jung
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引用次数: 0

摘要

由过渡金属碳化物或氮化物薄层组成的 MXenes 具有出色的导电性和快速离子传输特性,是电极材料的理想候选材料。电纺纳米碳纤维具有高多孔性和导电性,因此可用作电极材料。本研究通过湿法蚀刻 MAX(Ti3AlC2)相合成的 MXene(Ti3C2)胶体溶液浸涂碳纳米纤维(CNFs)制备了独立电极,并通过 X 射线衍射和傅立叶变换红外光谱研究了其化学结构。此外,还使用扫描和透射电子显微镜研究了 MXene 涂层 CNFs 的形态和晶体学特征。通过氮吸附/解吸测量研究了表面积和孔体积。以 1M 硫酸钠水溶液为电解质,通过组装 3 个电极系统研究了超级电容器的性能。在 0.5 A/g 时,MXene 涂层 CNFs 的最大比电容为 514 F/g,在 0.5 A/g 时的能量密度和功率密度分别为 71.4 Wh/kg 和 5 A/g 时的 2.3 kW/kg。在 5000 次循环期间,它们还表现出与 CNFs 相当的循环稳定性。这一结果表明,MXene 涂层碳纳米纤维可以成为电化学储能的有效电极材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Supercapacitor Performance of MXene-Coated Carbon Nanofiber Electrodes
MXenes consisting of thin layers of transition metal carbides or nitrides are good candidates for electrode materials due to their excellent electrical conductivity and fast ion transfer. Electrospun carbon nanofibers are highly porous and electrically conductive, making them attractive for electrode materials. In this study, free-standing electrodes were prepared by the dip-coating of carbon nanofibers (CNFs) in the MXene (Ti3C2) colloidal solution, which was synthesized via the wet-etching of MAX (Ti3AlC2) phase, and their chemical structures were investigated by X-ray diffraction and Fourier transform infrared spectroscopy. In addition, scanning and transmission electron microscopy were used to investigate the morphological and crystallographic features of MXene-coated CNFs. Surface area and pore volumes were investigated by nitrogen adsorption/desorption measurements. Supercapacitor performance was studied by assembling a 3-electrode system with 1M aqueous sodium sulfate solution as an electrolyte. MXene-coated CNFs exhibited a maximum specific capacitance of 514 F/g at 0.5 A/g, with energy and power densities of 71.4 Wh/kg at 0.5 A/g and 2.3 kW/kg at 5 A/g, respectively, which are relevantly higher compared to the pristine CNFs due to the pseudocapacitive behavior of MXenes. They also showed comparable cyclic stability during 5000 cycles with the CNFs. This result indicates that MXene-coated carbon nanofibers can be effective electrode materials for electrochemical energy storage.
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