Ti_(3)AlC_(2)和Ti_(3)SiC_(2)制Ti_(3)C_(2)T_(x)(MXene)材料电化学性能对比研究

Comparative study on electrochemical properties of Ti_(3)C_(2)T_(x)(MXene)materials prepared by Ti_(3)AlC_(2)and Ti_(3)SiC_(2)

以Ti_(3)AlC_(2)和Ti_(3)SiC_(2)为原料,采用传统的HF刻蚀方法成功制备出多层风琴状MXene材料,利用X射线衍射(XRD)和扫描电子显微镜(SEM)等方法表征MXene的物相和形貌,并采用循环伏安法、恒电流充放电和交流阻抗法等电化学测试手段研究了MXene材料电极的电化学性能.研究了刻蚀剂浓度及不同前驱体对所制MXene材料的形貌、结构及电化学性能的影响.结果表明,刻蚀剂浓度和前驱体对MXene材料的片层结构和电化学性能都有很大影响.刻蚀剂浓度的提高,可显著提升MAX相向MXene材料的转化,相同反应条件下,Ti_(3)AlC_(2)相比Ti_(3)SiC_(2)相更容易被刻蚀转换成MXene材料,且由Ti_(3)AlC_(2)制备的MXene材料的电化学性能优于由Ti_(3)SiC_(2)制备的MXene材料.

Using Ti_(3)AlC_(2) and Ti_(3)SiC_(2) raw materials,the multilayer organs like MXene material was successfully prepared by the traditional HF etching method.The physical structures and morphologies of MXene were characterized by X-ray diffraction and scanning electron microscopy.The electrochemical properties of the MXene electrodes were studied via cyclic voltammetry,galvanostatic charge-discharge and electrochemical impedance spectroscopy.The effects of etchant concentration and different precursors on the morphology,structure and electrochemical properties of mxene materials were discussed.The research shows that the concentration of etchant and the precursor have great influence on the structures and electrochemical properties of MXene.Increasing etchant′s concentration can significantly promote the transformation from MAX to multilayer MXene.Under the same reaction conditions,Ti_(3)AlC_(2) is easier to be etched into MXene than Ti_(3)SiC_(2),and the electrochemical performance of the material prepared by Ti_(3 )AlC_(2) is better than that prepared by Ti_(3)SiC_(2).