工程科学学报.第43卷.第6期：808-815.2021年6月 Chinese Journal of Engineering,Vol.43,No.6:808-815,June 2021 https://doi.org/10.13374/j.issn2095-9389.2020.12.05.001;http://cje.ustb.edu.cn 自支撑二维Ti3C2Tx(MXene)薄膜电化学性能 武伟，王恩会，杨涛四，侯新梅 北京科技大学钢铁共性技术协同创新中心，北京100083 ☒通信作者，E-mail:yangtaoustb(@ustb.edu.cn 摘要采用LiF-HCI混合溶液刻蚀法刻蚀TigAlC2得到Ti,CzT(MXene)胶体溶液，通过真空抽滤法抽滤MXene胶体溶液 得到柔性MXee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HSO4,MXene薄膜的厚度为6.6um时，在5mVs扫速下质量比电容达到 228Fg:同时随着扫速从5mVsl提升至100mV·s1时，电容保持率为51%.是40.2m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. 关键词MXene;二维材料：薄膜：电化学性能：电解液：厚度 分类号TQ134.1+1 Electrochemical performance of self-assembled two-dimensional TiC,T,(MXene)thin films WU Wei.WANG En-Hui.YANG Tao,HOU Xin-mei Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:yangtaoustb@ustb.edu.cn 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 TiC2T In several types of energy-storage systems,such as electrochemical hydrogen storage,supercapacitors,and lithium-ion batteries,Ti3C2T has shown exceptional performance as potential electrode material.In this work,Ti3C2T,colloidal solution was prepared by etching TiAlC2 with a LiF-HCI 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 收稿日期：2020-12-05 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)自支撑二维 Ti3C2Tx (MXene) 薄膜电化学性能 武    伟，王恩会，杨    涛苣，侯新梅 北京科技大学钢铁共性技术协同创新中心，北京 100083 苣通信作者，E-mail：yangtaoustb@ustb.edu.cn 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. 关键词    MXene；二维材料；薄膜；电化学性能；电解液；厚度 分类号    TQ134.1+1 Electrochemical performance of self-assembled two-dimensional Ti3C2Tx (MXene) thin films WU Wei，WANG En-Hui，YANG Tao苣 ，HOU Xin-mei Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China 苣 Corresponding author, E-mail: yangtaoustb@ustb.edu.cn 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 收稿日期: 2020−12−05 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） 工程科学学报，第 43 卷，第 6 期：808−815，2021 年 6 月 Chinese Journal of Engineering, Vol. 43, No. 6: 808−815, June 2021 https://doi.org/10.13374/j.issn2095-9389.2020.12.05.001; http://cje.ustb.edu.cn