Electrochemistry and polymerization mechanisms of thiophene-pyrrole-thiophene oligomers and terthiophenes. Experimental and theoretical modeling studies

Article Abstract:

The electrochemical properties of several thiophene-pyrrole-thiophene oligomers have been studied by cyclic voltammetry and double-potential-step chronoamperometry. Results show that substitution by a methyl group lowers the oxidation potential when the methyl is introduced on the beta'-positions of the mixed oligomers. The cation radical undergoes a coupling reaction in solution leading to a dimer or a polymer depending on the starting monomer. Coupling between two cation radicals has been observed in the alpha-unsubstituted oligomers.

Polymers, Polymerization, Substitution reactions

---

Characterization of Pt nanoparticles deposited onto carbon nanotubes grown on carbon paper and evaluation of this electrode for the reduction of oxygen

Article Abstract:

Multiwalled carbon nanotubes (MWCNTs) are grown on the fibers of a commercial porous carbon paper that are used as carbon-collecting electrodes in fuel cells and the Pt nanoparticles are characterized by cyclic voltammetry, transmission electron microscopy and X-ray photoelectron spectroscopy. Pt deposited onto loose MWCNTs all spread on the same side of the carbon paper is a better electrode choice for [H.sub.2]/[O.sub.2] fuel cells.

Observations, X-ray spectroscopy, Transmission electron microscopes, Platinum compounds, Chemical properties, Nanotubes

---

Electron transfer through a modified electrode with a fractal structure: Cyclic voltammetry and chronoamperometry responses

Article Abstract:

In case of chronoamperometry and linear sweep voltammetry, the problem of transfer by electron hopping through a volumic modified electrode with a fractal structural is investigated. The results based on theoretical treatment show that currents in chronoamperometry and the peak currents in cyclic voltammetry both depend linearly on a biligoarithmic scale with time and scan rate.

Electrodes

Similar abstracts:

• Abstracts: Role of triple bond in 1,2-diphenylacetylene crystal: A combined experimental and theoretical study. Atomic charges for classical simulations of polar systems
• Abstracts: Adsorption of 2-aminobenzothiazole on colloidal silver particles: An experimental and theoretical surface-enhanced Raman scattering study
• Abstracts: Molecular modeling of crystalline oligothiophenes: Testing and development of improved force fields. Modeling of molecular packing and conformation in oligofluorenes
• Abstracts: Photostimulated generation of defects and surface reactions on a series of wide band gap metal-oxide solids. Pyrene micropartitioning and slubilization by sodium dodecyl sulfate complexes with poly(ethylene glycol)
• Abstracts: Reduction of iron oxide catalysts: The investigation of kinetic parameters using rate perturbation and linear heating thermoanalytical techniques

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.