Mass tranfer of ions and solvent at redox processes in poly-3,4-ethylenedioxythiophene films

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 oxide deposited into PEDOT at different time of electrodeposition and apparent molar mass values of species, involved into mass transfer during cyclic voltammetry 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 counter ions (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 pseudo-capacitive behavior of the composite material. Specific capacity values of PEDOT/MnO2 composites obtained from cyclic voltammograms were found of about 169 F g-1. The specific capacity, related to the contribution of manganese oxide component, was about 240 F g-1 .

show abstract

“…Nevertheless, this value is in good agreement with those (80 g mol -1 and 82 g mol -1 ) reported previously in [35,37].…”

Section: Electrochemical Quartz Crystal Microbalance Study Of Pedot Fsupporting

confidence: 93%

“…EQCM has been earlier employed for the study of stoichiometry of mechanism of charge storage in PEDOT and MnO2 solely, and the contributions of different components of electrolytes into total mass change of PEDOT [31][32][33][34][35][36][37] and MnO2 [26][27][28][29][30] films were established.…”

Section: Introductionmentioning

confidence: 99%

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

Nizhegorodova

Eliseeva

Tolstopyatova

et al. 2018

J Solid State Electrochem

Self Cite

View full text Add to dashboard Cite

show abstract

“…Like in systematically CV experiments [49], conformational changes during electrochemical reaction hinder to reach a complete understanding of the temporal sequence of redox mechanism in PEDOT films. This aspect will be elucidated by acelectrogravimetry.…”

Section: Free Water Transfer During P-dopingmentioning

confidence: 99%

Electrochemically induced free solvent transfer in thin poly(3,4-ethylenedioxythiophene) films

Agrisuelas

Gabrielli

Garcı́a-Jareño

et al. 2015

Electrochimica Acta

View full text Add to dashboard Cite

“…1, curve 1). Moreover, the charging/ discharge processes of these films are reversible and not accompanied with any additional processes; both the cathodic and anodic currents increase in proportion to the potential scan rates, which is the direct evidence of reversible film charging/ discharge processes [25][26][27][28][29]. Besides, PEDOT films show a stable electrochemical response in aqueous solutions of 0.1 M sulfuric acid.…”

Section: Resultsmentioning

confidence: 90%

Electroless deposition of gold into poly-3,4-ethylenedioxythiophene films and their characterization performed in chloride-containing solutions

Kondratiev

Pogulaichenko

Suo

et al. 2011

J Solid State Electrochem

View full text Add to dashboard Cite

Au-containing polymer films were obtained by electroless deposition of gold from diluted solutions of HAuCl 4 into preliminarily reduced poly-3,4-ethylenedioxythiophene (PEDOT) films. Structural peculiarities of such pristine and composite films were characterized by scanning and transmission electron microscopy methods. It was established that the gold clusters forming under such deposition appear on the outer surface of polymer films and their pores. The clusters' sizes ranged between 30 and 100 nm depending on the time of exposition of a PEDOT film in solutions of Au(III) ions and the concentration of these ions. It was also observed that in contrast to pristine PEDOT films, cyclic voltammograms (CVs) of composite films in the presence of chloride ions show additional redox peaks resulting from oxidation of gold with formation of an insoluble product and followed by the product reduction under reversal of the potential scan direction. As a result of parallel electrochemical quartz crystal microbalance (EQCM) and CV measurements, it was also established that the number of chloride ions per one transferring electron in the gold oxidation process is near to unity. To elucidate the oxidation degree of gold in the presence of chloride ions, a special procedure of changing the electrode potential was used. It consisted of clamping the high anodic potential in the region of gold oxidation (0.97 V, Ag/AgCl) and subsequent gradual decrease of the electrode potential with a constant scan rate. Under these conditions, it was possible to completely oxidize all the gold particles containing in a composite film and find out the maximum amount of electricity consumed for the product particles' reduction. A comparison between such data and the results obtained in EQCM determinations of the gold content in the same film led to the conclusion that the oxidation state of gold in the complexes formed is Au(III). The effects of chloride ion concentration and scan rate of the electrode potential on current responses of PEDOT-Au films were investigated. Some primary conclusions on the kinetics of the studied processes are made.

show abstract

Mass tranfer of ions and solvent at redox processes in poly-3,4-ethylenedioxythiophene films

Cited by 13 publications

References 22 publications

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

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

Electrochemically induced free solvent transfer in thin poly(3,4-ethylenedioxythiophene) films

Electroless deposition of gold into poly-3,4-ethylenedioxythiophene films and their characterization performed in chloride-containing solutions

Contact Info

Product

Resources

About