Preparation and Property Comparison of Ti₂CT_x byMolten Salt Method and Liquid Phase Method

Ti₂CT_x 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 Ti₂CT_x 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 Ti₂CT_x 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. Ti₂CT_x prepared by molten salt method and liquid phase method both showed good rate performance and electrochemical reversibility, and the latter had better capacitance performance.