Preparation And Electrochemical Properties Of Polypyrrole Composites And Graphene Aerogels

As an example of conducting polymer,polypyrrole(PPy)has many characteristics including simple synthetic process,low cost,good electrical conductivity and electrochemical performance.Through a simple chemical oxidation method,PPy composites doped by sulfonated tannic acid were prepared in thesis work.Through electrochemical test,we studied the effects of the content of dopants electrochemical performance.In the above system,graphene oxide was introduced via in situ polymerization and we prepare sulfonated tannin acid/polypyrrole/graphene oxide ternary composites.In a series of tests including fourier Transform Infrared Spectroscopy(FTIR),scanning electron microscopy(SEM),thermogravimetric Analysis(TGA)and Raman,we study the characteristics of its morphology structure and thermal stability and the electrochemical test,we study the effect of doping agent dosage on The electrochemical properties.The results are shown as follows:(1)The preparation of sulfonated tannin acid/polypyrrole.Sulfonated tannin acid as the doping agent,can improve their ability of electron transfer.We prepare of different proportions of electrode materials by changing the sulfonated tannins of the inputs.In a series of tests,sulphonated tannins mass was 0.05 g,the morphology of Materials is complete,good thermal stability and the highest capacity performance.Under the 1 A/g current density,specific capacitance can reach 343.7 F/g more than pure polypyrrole.(2)The preparation of sulfonated tannin acid/ polypyrrole/graphene oxide.Sulfonated tannin acid as the doping agent,polypyrrole were prepared via in situ polymerization on the graphene oxide.Through changing the mass of graphene oxide,we prepared different proportions of electrode materials.Through a series of characterization showed that The addition of graphene oxide can improve system heat stability and cyclic stability.Through electrochemical test,under the 1A/g current density,specific capacitance can reach 282.5 F/g.Although the capacitor electrode material is reduced,but improve the ratio of performance and cycle life.After 3000 times of charging and discharging cycle stability of retention rate of 79%.(3)The preparation of graphene oxide-tannin acid aerogels.Through the hydrothermal preparation of the graphene aerogels,tannic acid as activator,by changing the mass of tannic acid,we studies the effect of the reticular structure of graphene aerogels by adding different activators.In a series of tests of Raman and XRD,We study the introduction of tannic acid on the influence of graphene oxide reduction.Through electrochemical test,under the 1 A/g current density,specific capacitance can reach 288.4 F/g.The device energy density can reach 50.6 Wh/Kg.