Preparation Of Micro-nano Structural PEDOT-MeOH And Their Supercapacitive Properties

With the development of portable electronic devices and electric vehicles,energy storage equipment has become more and more important.Electrochemical energy storage devices dominate among various types of energy storage systems.And,as a highly efficient,environmental protection,new energy storage devices,supercapacitors(SCs)have received extensive attention due to their fast charge-discharge capability,high power density and long cycle life.In addition to electrolyte,electrode material is one of the key factors that determine the performance of SCs.Among them,conductive polymers have attracted more and more attention because of their rapid redox activity,high conductivity,and low cost.Various nanostructure conductive polymers,such as nanowires,nanotubes,nanospheres and nanorods are emerging due to their high surface area,shorter electron/ion transfer paths and more redox reaction activity.The preparation of nanostructure conductive polymers has attracted widespread attention in both academia and industry.The water-soluble conductive polymer has the advantages of high solubility in water,convenient processing and wide application.Therefore,in this thesis,(2,3-dihydrothieno[3,4-b][1,4]dioxin-2-yl)methanol(EDOT-Me OH)was selected as the conductive polymer of our research,and we use electrochemical polymerization to prepare PEDOT-Me OH micro-nano structure with different morphologies from disorder to order.The main research contents are as follows:1.The PEDOT-MeOH/SWCNT nano network was prepared by one-step electrochemical co-deposition and its electrochemical performance was tested.The results of SEM and TEM confirmed that PEDOT-Me OH coated on the surface of SWCNT uniformly and formed a three-dimensional interpenetrating network.The electrochemical test results shown that the specific capacitance of PEDOT-MeOH/SWCNT was 114.3 m F cm-2 and shown good cycle stability of 80% after 5000 cycles.The assembled symmetrical supercapacitor based on PEDOT-Me OH/SWCNT,its highest energy density was 5.35 ?Wh cm-2 and its capacitance retention was 90%after 5000 cycles.2.PEDOT-MeOH-PNN coated PEDOT-MeOH-HNA(PEDOT-Me OHPNN@PEDOT-Me OH-HNA)was successfully fabricated using a template-free electrodeposition of EDOT-Me OH monomer and their electrochemical performance were tested.The results of SEM illustrated that PEDOT-Me OH-PNN was uniformly coated on the wall of the vertically grown PEDOT-Me OH-HNA and constructed a three-dimensional structure.The electrochemical results showed that the areal specific capacitance of the prepared PEDOT-Me OH-PNN@PEDOT-Me OH-HNA was 42.2 m F cm-2 at 5 m V s-1.The highest energy density of the assembled symmetric supercapacitor was 3.0 ?Wh cm-2.After 10000 cycles,its capacitance retention was 90%,and the rate performance and stability have been significantly improved.3.One-step electrochemical polymerization method was used to prepare PEDOT-MeOH porous micro-nano structure ordered array by using an ordered silicon pillar array as a template in an ACN-Li Cl O4(0.1M)solution,and its electrochemical performance was tested.After a series of optimization of deposition time,combined with the SEM of the prepared PEDOT-Me OH porous micro-nano structure ordered array,the areal specific capacitance of the optimal electrode was 58.81 m F cm-2 at 5m V s-1.And in the same way,PEDOT porous micro-nano structure ordered array was prepared as the negative electrode.And we assembled an asymmetric supercapacitors(ASCs)by using PEDOT-Me OH porous micro-nano structure ordered array as the positive electrode.The areal specific capacitance of this asymmetric supercapacitor was 70.55 m F cm-2 at 5 m V s-1,and the highest energy density was 18.22 ?Wh cm-2.After 10000 cycles,the capacitance retention was 88.3%.