Preparation And Properties Of Two-Dimensional Nano-Layered Ti₃C₂T_x And Its Composite Electrode By Inkjet Printing

Recently,the portable energy storage equipment is developing in the ultrathin,flexible and miniature direction.Then the printed supercapacitiors with light and flexible properties have become the focus of research.However,because the performance of supercapacitor electrode prepared by ink-jet printing is limited by the ink formula applied in this process,this paper first prepared MXene(Ti₃C₂T_x)by top-down chemical etching method,then developed two new printable ink formulas using MXene as conductive solute of conductive ink,and finally used in ink-jet printing technology to prepare supercapacitor electrode.The main research results are as follows:A printable ink with mixed solvent was designed.A series of MXene thin film electrodes with different transparency were prepared by adjusting the ink concentration.The results revealed that these Ti₃C₂T_x films prepared by ink-jet printing exhibited excellent optoelectronic properties and electrochemical performance;the Fo M(?_DC/?_OP)was within 0.0012-0.13;the area specific capacitance of the thin film electrode with 24%transmittance was 1225?F/cm² at scanning rate of 5 m V/s;the capacitance retention rate was 85%after 10000 cycles at the current density of 60?A/cm².The preliminary results indicated that these films could be employed to assemble symmetric or asymmetric flexible supercapacitors and showed an outstanding combination of energy and power densities.A printable MXene/Graphene composite ink was designed,and MXene based composite film electrodes with different graphene contents were successfully prepared by inkjet printing process.The results show that the interlayer spacing of MXene increases with the increase of graphene content.Among them,the MXene/1 wt.%Graphene composite film prepared by inkjet printing has excellent mechanical conductivity and large layer spacing,which shows the best volume capacitance.At the scanning speed of 5 m V/s,the volume specific capacitance is183.5 F/cm³.In addition,we also designed a printable MXene/MnO₂ composite ink.The MXene/MnO₂ composite electrode was also successfully prepared by ink-jet printing technology.The results show that there is a synergistic effect between MnO₂ and mxene,which can improve the overall electrochemical performance of MXene/MnO₂ composites.Among them,MXene/10 wt.%MnO₂ electrode has excellent mechanical conductivity,excellent volume capacitance,and its volume specific capacitance is 312 F/cm³ at the scanning speed of 5m V/s.These results indicate that the MXene based composite electrode via inkjet printing has great potential as supercapacitor electrode.