Capacitive properties of low potential electro-polymerized polyfluorene and activated carbon composite electrode  

作　　者：LIU Wei SUN MingLiang WANG Wei SONG LingXia GE HongLun SUN Miao ZHANG QingJie 

机构地区：[1]Institute of Material Science and Engineering,Ocean University of China,Qingdao 266100,China

出　　处：《Science China Chemistry》2012年第3期352-358,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (50903078);Specialized Research Fund for the Doctoral Program of Higher Education (New Teachers) (20090132120017);Promotive Research Fund for Excellent Young and Middle-aged Scientists of Shandong Province (BS2009CL036)

摘　　要：Polyfluorene (PF) film has been successfully electropolymerized at lower potential (0.91 V vs.Ag/AgCl) in the mixed electrolyte of boron trifluoride diethyl etherate and trifluoroacetic acid.The PF film is characterized to have about 10 repeat units and no presence of ketonic defect site.UV-vis and photoluminescent spectral studies indicate that the PF film is blue light emitting.From cyclic voltammetry and galvanostatic charge-discharge tests in 1 M lithium perchlorate/acetonitrile electrolyte,the polyfluorene/activated carbon electrode shows a specific capacitance of 227.1 F g-1 (per active layer mass) and reversible redox reaction at the potential of 1.4 V in a three electrode configuration.An asymmetric electrochemical capacitor based on this composite electrode and activated carbon electrode exhibits a specific energy of 14.7 Wh kg-1 (per active layer mass).These results indicate that electrochemically prepared polyfluorene could be used as energy storage component for electrochemical application.Polyfluorene （PF） film has been successfully electropolymerized at lower potential （0.91 V vs. Ag/AgCl） in the mixed electro- lyte of boron trifluoride diethyl etherate and trifluoroacetic acid. The PF film is characterized to have about 10 repeat units and no presence of ketonic defect site. UV-vis and photoluminescent spectral studies indicate that the PF film is blue light emitting. From cyclic voltammetry and galvanostatic charge-discharge tests in 1 M lithium perchlorate/acetonitrile electrolyte, the polyfluorene/activated carbon electrode shows a specific capacitance of 227.1 F g-1 （per active layer mass） and reversible re- dox reaction at the potential of 1.4 V in a three electrode configuration. An asymmetric electrochemical capacitor based on this composite electrode and activated carbon electrode exhibits a specific energy of 14.7 Wh kg-1 （per active layer mass）. These results indicate that electrochemically prepared polyfluorene could be used as energy storage component for electrochemical application.

关 键 词：POLYFLUORENE boron trifluoride diethyl etherate trifluoroacetic acid lithium perchlorate ACETONITRILE cyclic voltammetry galvanostatic charge-discharge 

分 类 号：O646.54[理学—物理化学] TM53[理学—化学]