EQCM study of redox properties of PEDOT/MnO2 composite films in aqueous electrolytes

A. O. Nizhegorodova, S. N. Eliseeva, E. G. Tolstopjatova, G. G. Láng, D. Zalka, M. Ujvári, V. V. Kondratiev

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Electrochemical behavior of poly-3,4-ethylenedioxythiophene composites with manganese dioxide (PEDOT/MnO2) has been investigated by cyclic voltammetry and electrochemical quartz crystal microbalance at various component ratios and in different electrolyte solutions. The electrochemical formation of PEDOT film on the electrode surface and PEDOT/MnO2 composite film during the electrochemical deposition of manganese dioxide into the polymer matrix was gravimetrically monitored. The mass of manganese dioxide deposited into PEDOT at different time of electrodeposition and apparent molar mass values of species involved into mass transfer during redox cycling of PEDOT/MnO2 composites were evaluated. It was found that during the redox cycling of PEDOT/MnO2 composite films with various MnO2 content, the oppositely directed fluxes of counterions (anions and cations) occur, resulting in a change of the slope of linear parts of the Δf–E plots with changing the mass fraction of MnO2 in the composite film. Rectangular shape of cyclic voltammograms of PEDOT/MnO2 composites with different loadings of manganese dioxide was observed, which is characteristic of the pseudocapacitive behavior of the composite material. Specific capacity values of PEDOT/MnO2 composites obtained from cyclic voltammograms were about 169 F g−1. The specific capacity, related to the contribution of manganese dioxide component, was about 240 F g−1.

Original languageEnglish
Pages (from-to)2357-2366
Number of pages10
JournalJournal of Solid State Electrochemistry
Volume22
Issue number8
DOIs
Publication statusPublished - Aug 1 2018

Keywords

  • Composite materials
  • Cyclic voltammetry
  • Electrochemical quartz crystal microbalance
  • Manganese dioxide
  • Mass transport
  • Poly-3,4-ethylenedioxythiophene

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'EQCM study of redox properties of PEDOT/MnO<sub>2</sub> composite films in aqueous electrolytes'. Together they form a unique fingerprint.

  • Cite this