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.
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Funding
This study received support from the Russian Foundation for Basic Research (grant no. 16-03-00457) and the Hungarian National Research, Development and Innovation Office – NKFI-OTKA (grants nos. K 109036 and VEKOP-2.3.2-16-2017-00013, co-financed by the European Regional Development Fund).
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Nizhegorodova, A.O., Eliseeva, S.N., Tolstopjatova, E.G. et al. EQCM study of redox properties of PEDOT/MnO2 composite films in aqueous electrolytes. J Solid State Electrochem 22, 2357–2366 (2018). https://doi.org/10.1007/s10008-018-3950-y
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DOI: https://doi.org/10.1007/s10008-018-3950-y