Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Facile Coating of Poly(3,4-ethylenedioxythiophene) on Manganese Dioxide by Galvanic Displacement Reaction and Its Electrochemical Properties for Electrochemical Capacitors

  • Kim, Kwang-Heon (Department of Material Science and Engineering, Yonsei University) ;
  • Kim, Ji-Young (Department of Material Science and Engineering, Yonsei University) ;
  • Kim, Kwang-Bum (Department of Material Science and Engineering, Yonsei University)
  • Received : 2012.05.01
  • Accepted : 2012.05.01
  • Published : 2012.08.20
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Abstract

Poly(3,4-ethylenedioxythiophene) coated Manganese Dioxide (PEDOT/$MnO_2$) composite electrode was fabricated by simply immersing the $MnO_2$ electrode in an acidic aqueous solution containing 3,4-ethylenedioxythiophene (EDOT) monomers. Analysis of open-circuit potential of the $MnO_2$ electrode in the solution indicates the reduction of outer surface of $MnO_2$ to dissolved $Mn^{2+}$ ions and simultaneously oxidation of EDOT monomer to PEDOT on the $MnO_2$ surface to form a PEDOT shell via a galvanic displacement reaction. Analysis of cyclic voltammograms and specific capacitance of the PEDOT/$MnO_2$, conductive carbon added $MnO_2$ and conductive carbon added PEDOT/$MnO_2$ 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 $MnO_2$ acts to increase the active reaction site of $MnO_2$.

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