超级电容器用聚吡咯%2f改性石墨复合电极材料地研究.pdf

Y2122600 ?一 Abstract Inthispaper,the expanded graphite①G)was prepared by expanding flake ,polypyrrole/expanded positesO'PymG)and polypyrrole/modified graphite(PPy/posites were synthesized by oxidative polymerization and in- p-toluene sulfonicacid(TSA)and ammonium persulfate(APS)as dopants were effects ofthetypeand amount ofthedoped agent,mass ratio Ontheproperties posites were order posite and reduction processes on theproperties posites were also posites were characterized byXRD,SEM andIR,and the electrochemical properties were tested by cyclic voltammetry,galvanostatic charge-discharge,four-point probeandimpedance spectroscopy methods. The resultsshow thatthetypeandamount ofthedoped agent havegreat influence Onthemicrostructureand electrochemical performances method posite beforethe reduction process Can posites and posites with TSA as thedoped agent, when theoptimalamount ofTSA %and theoptimal mass ratiois3:1,thespecific capacitance ofthe posites measured by cyclicvoltammetry method atthescanning V/sand apacitance oftheassembled supereapacitor measured bygalvanostatic charge-discharge method atthe current density of posites withAPS asthedoped agent,when the optimal amount ofAPS %and theoptimal mass ratio is3:1,thespecific capacitance ofthe posites measured bycyclicvoltammetry method atthescanning rate V/sand apacitance oftheassembled supemapacitor measured bygalvanostatic charge—discharge method atthe Abstract L" ....1it current density of conductivity of posites isobviously improved by posite method ofpolypyrrole andmodified ,for posites with APS asthedoped agent,PPy isdispersed evenly onthesurface,edge and between layers ofEG,and the conductivity posites doped by APS show excellent electrochemical proper