Preparation And Electrochemical Properties Of MXene/Polypyrrole Porous Composite Films

In order to satisfy the development needs of modern electroanalytical technology and the current situation of energy crisis caused by resource shortage,the preparation of high-performance electrode materials has important research significance.The main content of this paper is the construction of three-dimensional porous structure based on MXene/Polypyrrole composite,and the influence of porous structure on its electrochemical performance is discussed.The specific research contents are as follows:The MXene/DODA complex was successfully obtained by combining dioctadecyldimethylammonium bromide(DODA)with MXene through a simple electrostatic interaction and transferring MXene into the organic phase chloroform solution,and the MXene/DODA porous thin film was prepared by the water droplet template method using the organic solution of this complex as the casting solution,and the electrochemical workstation was used to systematically The sensing performance of the MXene/DODA porous films modified with ITO electrode for dopamine(DA)was evaluated systematically using an electrochemical workstation.Thanks to the rich functional groups on the MXene surface,the increased layer spacing of the MXene sheet and the large specific surface area of the three-dimensional porosity,the detection sensitivity of the porous film-modified electrode can reach 4.09μA/μM and the detection limit is as low as 36.8 n M,which is 5.5 times more sensitive and 0.07 times lower than that of the planar film,respectively.It also demonstrates excellent selectivity,interference resistance,repeatability,reproducibility,stability,and high accuracy for actual sample testing.Based on the MXene/DODA porous films,the DODA with poor conductivity was removed by proton exchange treatment,and then polypyrrole(PPy)was deposited on the surface of MXeneT porous film by electrochemical polymerization method,and the MXeneT/PPy porous composite film was successfully prepared.Combining the ultra-high conductivity of MXene,the good energy storage property of PPy and the three-dimensional porous structure,the composite film exhibits good capacitive performance.In the three-electrode test system,the specific capacity of MXeneT/PPy porous film modified ITO electrode could reach 415.62 m F/cm~2,and the electrode had74.28%capacitance retention after 2000 cycles of the test.After assembled into an asymmetric supercapacitor(ASC),the device obtained an energy density of up to 29.72Wh/kg at a power density of 295.26 W/kg,and the specific capacity of the device could still be maintained at the initial 55.74%after 2000 cycle tests,showing good charge storage performance.This paper provides a new idea of using two-dimensional nano materials to construct three-dimensional porous structures,which could be widely used in electromagnetic shielding,supercapacitors,batteries,electrocatalysis and other applications.