Preparation And Application In Supercapacitor Of Mxene-Ti₃C₂ Matrix Composite

MXenes has excellent physical and chemical properties,and is easy to be modified.The proper control of its components can obtain 2D layered nanomaterials with good performance.Ti₃C₂ is a family of MXenes has great prospects of electrochemical electrode materials,but the buildup of lamella in organ shape will cause its electrochemical performance loss dries up,leading to the specific capacitance needs further improve.In order to solve the above problems when Ti3C2 is used as electrode material of supercapacitor,the following results have been achieved in this paper.?1?In order to solve the problem of Ti₃C₂ lamination,and further improve the specific surface area of Ti₃C₂,the PANI and Ti₃C₂ composite materials were synthesized by low-temperature stirring method?PANI-Ti₃C₂?.According to the test results of SEM,TEM and XRD,the PANI nanoparticles were uniform loaded on the surface of Ti₃C₂.The results of electrochemical test showed that,the maximum specific capacity of the PANI-Ti₃C₂ nanocomposite was 164 F g^-1 at the scanning rate of 2 mV s^-1,which was 1.25 times higher than the 131 F g^-1 of Ti₃C₂.In addition,the capacity of PANI-Ti₃C₂ was 96%after3000 cycles at current density of 3 A g^-1,showing good cycle stability.In the PANI-Ti₃C₂ nanocomposites,PANI nanoparticles as spacers between the layers that prevent Ti₃C₂ slice layer accumulation,and provide greater specific surface area and more active site,which make the electrochemical properties of PANI-Ti₃C₂ remarkably enhanced.?2?In order to solve the problem that PANI particles are unavoidably falling off from the PANI-Ti₃C₂ nano-composite electrode in the electrochemical test.Then,the electrochemical stability of the composite is reduced.This part adopt simple stirring in organic acid aqueous solution,such as,oxalic acid,tartaric acid and citric acid at low temperature.During the preparation of O-PANI-Ti₃C₂,T-PANI-Ti₃C₂ and C-PANI-Ti₃C₂ composites,the organic acid as the bridge between PANI and Ti₃C₂ involved in the synthesis process of the composites.The electrochemical test results show that the O-PANI-Ti₃C₂,T-PANI-Ti₃C₂ and C-PANI-Ti₃C₂ composites are showed good cycle stability,the capacity retention rate of the composites are 88.9%,74.9%and 99.4%,respectively,after 6000 cycles in the current density 3 A g^-1.O-PANI-Ti₃C₂ has a maximum specific capacity of 150.1 F g^-1 at the scanning rate 2 mV s^-1,and shows high rate performance.The improvement of electrochemical properties of the composites are mainly on account of organic acids provide a bridge between PANI and Ti₃C₂,and PANI provides additional pseudocapacitance.?3?In order to further improve the specific surface area and conductivity of Ti₃C₂,the amino functionalized Ti₃C₂?NH₂-Ti₃C₂?was prepared by oil bath method.According to the scanning electron microscope?SEM?and X-ray photoelectron spectroscopy?XPS?,the results showed that the organ-like Ti₃C₂form rod NH₂-Ti₃C₂ nanocomposite after dealing with the amination.The electrochemical test results show that the NH₂-Ti₃C₂ compared with Ti₃C₂ has a stronger specific capacity 170.1 F g^-1 at 2 mV s^-1,and showed better cycle stability and good rate performance.NH₂-Ti₃C₂ showed increasing specific surface area,and containing N group?amino?provides additional pseudocapacitance make the NH₂-Ti₃C₂ showed excellent electrochemical performance.