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Preparation and Performance Study of Polypyrrole/polyoxometalates Electrode Material for Electrochemical Supercapacitors

Author: XingYan
Tutor: XuLin
School: Northeast Normal University
Course: Inorganic Chemistry
Keywords: Electrochemical capacitors Polyoxometalates Polypyrrole Multi-walled carbon nanotubes Electrochemical polymerization Chemical oxidative polymerization
CLC: TM53
Type: Master's thesis
Year: 2010
Downloads: 154
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Abstract


Organic - inorganic hybrid material is conductive polymers and polyoxometalates combined together to form a novel electrochemical capacitor electrode material . In this paper , the chemical oxidative polymerization and electrochemical polymerization prepared the polypyrrole / polyoxometalate hybrid materials , and by cyclic voltammetry, galvanostatic charge and discharge testing means electrochemical electrode material and capacitor properties were studied. By electrochemical polymerization ( cyclic voltammetry technique) in graphite board prepared PPy/P2Mo18 electrochemical capacitor electrode material , and to explore the of the the sweep of preparation of PPy/P2Mo18 electrode the speed and P2Mo18 solution concentration . In the voltage range of 0.7 V to -0.1 V , the electrodeposition when the scan rate of 5 mV / s , P2Mo18 concentration of the solution prepared under the experimental conditions of 0.030 mol / L PPy/P2Mo18 higher than the capacity of the electrode . Prepared under optimal experimental conditions PPy/P2Mo18 electrodes were characterized by infrared spectroscopy and cyclic voltammetry , and charge-discharge and electrochemical impedance spectroscopy (EIS) to study the properties and electrochemical properties of the electrode capacitance . Chemical oxidative polymerization PPy/PMo12 , and PPy/PW6Mo6 electrochemical capacitor electrode material , and by cyclic voltammetry , charge-discharge cycle life test electrochemical properties of these two kinds of electrode materials and capacitive nature research . Calculated based on constant current charge- discharge curve has a higher value of specific capacity and good cycle stability PPy/PW6Mo6 hybrid materials based electrochemical capacitors . Therefore , PPy/PW6Mo6 hybrid material that is more suitable for use as electrode material of electrochemical capacitors . PPy/P2Mo18, MWNTs and PPy/P2Mo18-MWNTs electrochemical capacitor electrode material was prepared and carried out a comparative study of electrochemical properties of these kinds of materials and capacitive properties by cyclic voltammetry and constant current charge and discharge . Charge-discharge curve calculated PPy/P2Mo18-MWNTs complex than capacity value higher than capacity value than mere MWNTs or PPy/P2Mo18 of hybrid materials , mainly electric double layer capacitor the the Faraday pseudocapacitive combination results. In addition, we studied the content of the carbon nanotubes in the composite material (25%, 33% , 50%) Comparative Capacity of the results show that when the composite material of MWNTs content of 25% , which is higher than the capacity value .

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CLC: > Industrial Technology > Electrotechnical > Electrical > Capacitor
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