Andrey Kurbatov

Auto-Reparation of Polyimide Film Coatings for Aerospace Applications Challenges & Perspectives

© 2012 Abadie et al., licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Auto-Reparation of Polyimide Film Coatings for Aerospace Applications Challenges & Perspectives

Electrochemical deposition of indium: nucleation mode and diffusional limitation

Abstractthe electrochemical deposition of indium metal from InCl3 solutions was investigated. Cyclovoltammetric experiments showed that the initial hydrogen evolution reaction, observed together with the metal deposition on Pt surface, is blocked when the surface is covered by In. At large cathodic potentials, the current is diffusion-limited. The scan rate dependence of cyclovoltammograms allowed the determination of the diffusion coefficient of In3+ ions, 8.18 × 10–6 cm2/s, using the Delahay equation. The activation energy of diffusion, determined from the temperature dependence of cyclovoltammograms, is about 0.3 eV (23 kJ/mol). Chrono-amperometric experiments are consistent with the cyclovoltammetry; the In3+ diffusion coefficient determined using the Cottrell law is in good agreement with the value determined by the Randles-Ševčik equation. Moreover the use of the nucleation models developed by Scharifker and Hills showed a progressive nucleation mode. Electron microscopy observations and X-ray diffraction patterns confirmed the formation of crystalline indium deposits.

Chemical Oxidation of LiFePO 4 in Aqueous Medium as a Method for Studying Kinetics of Delithiation

The kinetics of LiFePO4 oxidation by hydrogen peroxide in aqueous alkaline medium is studied with the use of potentiometric determination of lithium concentration in solution during delithiation. It is demonstrated that the lithium transfer through the reaction-product layer is controlled by diffusion. The activation energy and the diffusion coefficient of the species transferred in the solid phase during the chemical reaction of oxidative delithiation are determined and the parameters of this processes are analyzed.

Voltammetry of indium in sulfate electrolytes

The electrochemical behavior of indium on glassy carbon electrode in sulfate solution was studied. The influence of various factors (temperature, sweep rate, the hydrodynamic conditions, the concentration of the electrolyte) on the processes of discharge-ionization of indium was defined. It is established that the occurring processes have phasic character. From cyclic polarization curves calculated estimated value of indium output current.