Tsurkan A. Electrochemical synthesis and properties of Fe-TiO2 composite coatings

The object of research is the electrodeposition of polyfunctional composite coatings from methanesulfonate electrolytes. The purpose of the study is to establish the basic laws of electrochemical synthesis of nanostructured Fe-TiO2 composite coatings from methanesulfonate electrolytes and determine the properties of these coatings. Methods of research - cyclic voltammetry, chronoamperometry, method of electrode impedance (study of kinetics of electrochemical processes); photocolorimetry (analysis of the composition of solutions); the method of dynamic light scattering (determination of the distribution of particles in ash and colloidal electrolyte by size); scanning electron microscopy, energy dispersion X-ray spectroscopy and X-ray diffraction analysis (characteristic of morphology, structure and chemical composition of synthesized coatings). Theoretical and practical results: The complex of experimental data on the influence of electrolyte composition and electrolysis conditions on TiO2 content in Fe-TiO2 composite coatings, their physico-chemical, photocatalytic and electro-catalytic properties is a scientific basis for new high-efficient, environmentally safe, resource and energy-saving technologies of synthesis of photo and electrocatalysts. Novelty of the Positions and Results: In the work for the first time a complex of systematic experimental data on the influence of various factors on the electrochemical synthesis of nanocomposite coatings of Fe-TiO2 from methanesulfonate electrolyte and on their composition, structure and properties was obtained; to establish the kinetic patterns and the mechanism for the introduction of TiO2 particles into the iron matrix and to show that the composite deposition process is described by an improved Guglielmi model (which takes into account the influence of the content of the dispersed phase on the degree of surface filling); to develop the method of electrochemical application of a protective film СeO2 from a solution containing cerium ions of methanesulfonate (III) on the surface of iron coatings and Fe-TiO2 in order to increase their corrosion resistance; to find out the influence of the size of the particles of the dispersed phase, the method of their synthesis and modification by Ag + ions on the surface morphology and the complex of properties of composite coatings; To estimate photocatalytic activity of Fe-TiO2 nanocomposite coatings in reactions of photochemical destruction of some organic dyes; Determine the electrocatalytic activity of composite galvanic substances in the processes of hydrogen and oxygen release in alkaline media (which is related to the presence of TiO2 and / or oxidation-reducing forms of Ti2O3-TiOH, enhancing electro-catalytic influence). Scope: The results of the dissertation work on the influence of the composition of the electrolyte and the conditions of electrolysis on the content of TiO2 in composite coatings, their physico-chemical, photo and electro-catalytic properties are essential for electrochemistry.