熔盐法与液相法制备Ti2CTx及性能对比

Preparation and Property Comparison of TiCT by Molten Salt Method and Liquid Phase Method

采用熔盐法(NaF+KF)和液相法(HCl+NaF)刻蚀Ti2AlC制备得到Ti2CTx,对比研究了2种方法下刻蚀产物的物相组成、微观形貌、表面官能团及电化学性能。结果表明:液相法所得Ti2CTx纯度较高,表面有4种官能团(C-O、C=O、C-F和O-H),杂质主要为TiC;熔盐法所得Ti2CTx片层间距较小,表面有2种官能团(C=O和O-H),杂质主要为K2NaAlF6;熔盐法及液相法制得的Ti2CTx均表现出良好的倍率性能及电化学可逆性,后者电容性能更佳。

Ti2CTx was prepared through etching Ti2AlC by molten salt method(NaF+KF)and liquid phase method(HCl+NaF).The phase composition,microscopic morphology,surface functional groups and electrochemical properties of etched products by the two methods were compared and studied.The results show that the Ti2CTx obtained by liquid phase method had higher purity with four functional groups(C-O,C=O,C-F and O-H)on the surface,and the main impurity was TiC.The Ti2CTx obtained by molten salt method had small interlayer spacing with two functional groups(C=O and O-H)on the surface,and the main impurity was K2NaAlF6.Ti2CTx prepared by molten salt method and liquid phase method both showed good rate performance and electrochemical reversibility,and the latter had better capacitance performance.