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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 8
BKCSDE 33(8)
August 20, 2012 

Facile Coating of Poly(3,4-ethylenedioxythiophene) on Manganese Dioxide by Galvanic Displacement Reaction and Its Electrochemical Properties for Electrochemical Capacitors
Kwang-Heon Kim, Ji-Young Kim, Kwang-Bum Kim*
MnO2, PEDOT, Galvanic displacement reaction, Electrochemical capacitor
Poly(3,4-ethylenedioxythiophene) coated Manganese Dioxide (PEDOT/MnO2) composite electrode was fabricated by simply immersing the MnO2 electrode in an acidic aqueous solution containing 3,4- ethylenedioxythiophene (EDOT) monomers. Analysis of open-circuit potential of the MnO2 electrode in the solution indicates the reduction of outer surface of MnO2 to dissolved Mn2+ ions and simultaneously oxidation of EDOT monomer to PEDOT on the MnO2 surface to form a PEDOT shell via a galvanic displacement reaction. Analysis of cyclic voltammograms and specific capacitance of the PEDOT/MnO2, conductive carbon added MnO2 and conductive carbon added PEDOT/MnO2 electrodes suggests that the conductive carbon acted mainly to provide a continuous conducting path in the electrode to improve the rate capability and the PEDOT layer on MnO2 acts to increase the active reaction site of MnO2.
2529 - 2534
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