Preparation of Ti₃C₂T_x MXene/GO Composites with Enhanced Electrochemical Performance as the Electrode of Lithium-Ion Capacitors

Ti₃C₂T_x MXene has been actively studied as a promising energy storage material. In this paper, Ti₃C₂T_x MXene was prepared by selective removal of Al from Ti₃AlC₂ structure and then composited with graphene oxide (GO) to further improve the performance of Ti₃C₂T_x MXene. The as-prepared samples were characterized by using SEM and XRD techniques. SEM images of the Ti₃C₂T_x MXene exhibits a typical accordion-like morphology after removal of Al from Ti₃AlC₂ structure. The multiple-layered MXene were exfoliated into mono- or few-layered ones by using ultrasound assisted approach. XRD results indicate that the (002) crystal plane are left-shifted due to the surface termination and larger interlayer spaces of the samples. Electrochemical tests of the samples indicate the sample of Ti₃C₂T_x MXene composited with 0.5 g GO exhibits a capacity of 758 F/g at the scan rate of 10 mV/S, with the increasing of scan rate, the capacity retention rate is 58.83%, which is regarded as the optimum electrode.