Ya. I. Kurys

Heteropolyacid/m-cresol system as a primary/secondary dopant combination for polyaniline

Abstract The method for the preparation of soluble polyaniline PAn doped with heteropolyacid (HPA), using 12-phosphomolybdic acid (PMA) as an example, was proposed. It is established that new spectral and electrophysical properties of the PAn·PMA are the consequence of secondary doping of PAn with m -cresol. The solubility of the PAn·PMA enables the preparation of conducting composite films with dielectric polymers that allows the variation in conductivity value and the improvement of the mechanical properties of the conducting material.

Graphene Oxide Composites with Silver Nanoparticles: Photochemical Formation and Electrocatalytic Activity in the Oxidation of Methanol and Formaldehyde

The photolysis of AgCl nanoparticles stabilized in aqueous solution by graphene oxide or photo reduced graphene oxide using visible light gave nanocomposites containing silver nanoparticles with mean diameter 25-30 nm. These composites have electrocatalytic activity in the oxidation of methanol and formaldehyde in alkaline media. The oxidation of formaldehyde occurs prior to the electrochemical formation of the oxide phase on the silver nanoparticle surface, while the oxidation of methanol occurs after the electrochemical formation of the oxide phase.

Electrocatalytic properties of nanocomposites based on conducting polymers and titanium dioxide in oxygen reduction process

Electrochemical characteristics and electrocatalytic properties in the oxygen reduction reaction are studied on hybrid nanocomposites based on conducting polymers (polyaniline, polypyrrol) doped with phosphomolybdic acid (PMA), and TiO2 and also their bifunctional analogs containing up to 5 wt % of nanosize platinum. It is found that the obtained nanocomposites in 0.5 M H2SO4 are capable of reversible electro-chemical redox transitions (in the range of potentials from −0.6 to 1.0 V vs. Ag/AgCl), in which the main contribution is provided by the corresponding conducting polymer and dopant (PMA). It is shown that activity of the studied nanocomposites in the oxygen reduction reaction is caused by the joint catalytic effect of all their components: the polymer, TiO2, H3PMo12O40, Pt.

Nanocomposites Produced by Direct Intercalation of Secondary Doped Polyaniline in V2O5

The possibility of the production of nanocomposites based on V2O5 and conducting polymers by direct intercalation of macromolecules of secondary doped polyaniline into the interlayer galleries of nanoparticles of aqueous V2O5 sol was demonstrated for the first time. The driving force of the intercalation process is substitution of the protons present in the galleries of the V2O5 by a polyaniline chain carrying a positive charge.

Spectral and electrochemical properties of polyaniline-V2O5 composites of the intercalation type

We propose a new approach to obtaining composites of the intercalation type based on polyaniline and V2O5. We have determined the characteristics of these composites using x-ray diffraction, IR spectroscopy, and EPR. We show that the compounds obtained exhibit stable redox properties in aqueous and aprotic electrolytes.

Conducting Polymer Based Nanocomposite Materials for Various Functional Applications

Results are summarized for studies on the development of hybrid nanocomposite materials based on organic conjugated conducting polymers (CP) such as polyaniline, polypyrrole, and polythiophene as well as studies of the structure, physicochemical, and functional characteristics of these materials. Such nanocomposites have been shown to display new functional properties due to the interaction of their components. These materials hold promise for use in various areas (chemical power sources, optoelectronics, and electrocatalysis) for creation of advanced devices. Significant attention is given to nanocomposites based on CP and various 2D materials prepared by mechanochemical and electrochemical methods.

Electrocatalysis of Electrochemical Hydrogen Evolution from Water in Acid Media Using N-Containing Conjugated Polymers

The possibility is demonstrated for the display of electrocatalytic activity in hydrogen evolution by a series of N-containing organic conjugated polymers in acid media. Modification of a glassy carbon electrode with poly-5-aminoindole, poly-8-aminoquinoline, or poly-o-phenylenediamine, in contrast to polyaniline, polypyrrole, poly-m-phenylenediamine, poly-o-aminophenol, polyindole, and poly-2-aminopyridine, leads to enhanced efficiency of electrochemical hydrogen evolution, namely, to a decrease in the Tafel slope, a decrease in the onset potential of the process, and a decrease in the overpotential at a given current density.

Oxygen Reduction Nanocomposite Electrocatalysts Based on Polyindole, Cobalt, and Acetylene Black

Polyindole (PIn), cobalt, and acetylene black (C) were used to obtain non-precious-metal nanocomposite electrocatalysts for the oxygen reduction reaction (ORR). We studied the composition, structure, and electrochemical properties of these materials. The PIn-Co/Cpyr obtained with treatment at elevated temperature, have much greater electrocatalytic activity in ORR in 0.05 M sulfuric acid in comparison with nonpyrolyzed (metal–polymer composite) PIn-Co/C, which may be attributed to differences in the catalytically-active sites in these composites.

Effect of the nature of the organic aprotic electrolyte on processes of electrochemicalp-doping/de-doping of soluble polyaniline

We have investigated the effect of the nature of the aprotic organic solvent and the supporting electrolyte on the electrochemical and spectrophotometric characteristics of soluble polyaniline perchlorate and tetrafluoroborate. We have established the presence of solvation and donor-acceptor interactions in the solublep-doped polyaniline-organic aprotic electrolyte system.

Influence of the medium on the electrochemical behavior of polyaniline in aprotic electrolytes

The electrochemical behavior of polyaniline films in aprotic bipolar organic electrolytes has been studied. The redox properties of polyaniline are affected by the nature of the solvent (γ-butyrolactone, acetonitrile, propylene carbonate), the cation of the background electrolyte, and crown ether.