| 自支撑二维Ti3C2Tx(MXene)薄膜电化学性能 |
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| 作者姓名： | 武伟 王恩会 杨涛 侯新梅 |
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| 作者单位： | 北京科技大学钢铁共性技术协同创新中心，北京 100083 |
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| 基金项目： | 国家杰出青年基金资助项目（52025041）；国家自然科学基金资助项目（51904021，51902020）；中央高校基本科研业务费资助项目（FRF-TP-19-004B2Z，FRF-TP-18-045A1） |
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| 摘 要： | 采用LiF?HCl混合溶液刻蚀法刻蚀Ti3AlC2得到Ti3C2Tx(MXene)胶体溶液，通过真空抽滤法抽滤MXene胶体溶液得到柔性MXene薄膜。使用X射线衍射(XRD)、扫描电子显微镜(SEM)、能量色散谱(EDS)和X射线光电子能谱(XPS)等方法表征MXene的物相、形貌及化学元素，并采用循环伏安、恒电流充放电、交流阻抗法等电化学测试手段研究MXene薄膜电极的电化学性能。研究显示:当电解液为H2SO4，MXene薄膜的厚度为6.6 μm时，在5 mV·s?1扫速下质量比电容达到228 F·g?1；同时随着扫速从5 mV·s?1提升至100 mV·s?1时，电容保持率为51%，是40.2 μm厚度MXene薄膜电极的3倍。该研究展示酸性电解液和较薄的薄膜厚度有利于提高MXene材料基超级电容器的性能。
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| 关 键 词： | MXene 二维材料 薄膜 电化学性能 电解液 厚度 |
| 收稿时间： | 2020-12-05 |
Electrochemical performance of self-assembled two-dimensional Ti3C2Tx(MXene) thin films |
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| Authors: | WU Wei WANG En-Hui YANG Tao HOU Xin-mei |
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| Affiliation: | Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | With the rapid growth in the demand for portable/wearable electronic products, the demand for high-performance, flexible, and lightweight power is becoming stronger. Given the excellent cyclic stability, high rate of charge/discharge, and high power density of supercapacitors, they have become ideal devices to meet the power requirements of portable/wearable electronic products. The most effective method to enhance supercapacitor performance is to improve the electrode materials. Lately, researchers have concentrated on exploring and developing excellent-performance electrode materials. Two-dimensional (2D) materials are the most prospective supercapacitor materials owing to their outstanding properties. Transition-metal carbides and nitrides (MXene), a novel family of 2D materials, have been found to exhibit relatively better chemical stability, higher surface area and active surface sites, excellent hydrophilicity, and higher electrical conductivity. The earliest explored and the most widely applied MXene is Ti3C2Tx. In several types of energy-storage systems, such as electrochemical hydrogen storage, supercapacitors, and lithium-ion batteries, Ti3C2Tx has shown exceptional performance as potential electrode material. In this work, Ti3C2Tx colloidal solution was prepared by etching Ti3AlC2 with a LiF–HCl mixed solution and a flexible MXene film was obtained via vacuum filtration. The physical structures and morphologies of graphene and chemical elements were characterized via X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The capacitance properties of the MXene film electrode were studied via cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The research shows that in H2SO4 electrolyte, the MXene film thickness is 6.6 μm, and the mass-specific capacitance can reach 228 F·g?1 at 5 mV·s?1. When the scanning speed increases to 100 mV·s?1, the capacitance retention rate can reach 51%, which is three times that of the 40.2 μm MXene film electrode. The research shows that acidic electrolyte and thin film are beneficial to improve the performance of MXene supercapacitors. |
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