Dobrovetska O. Electrochemical deposition of catalytically active nanoparticles of Pd-Au in environments of organic aprotic solvents

Object of study - the electrochemical deposition of catalytically active nanoparticles Pd-Au among aprotic organic solvents. Purpose is the development of scientific bases and technological bases of electrochemical deposition of catalytically active nanoparticles Pd-Au by pulsed electrolysis mode among aprotic organic solvents. Methods: hronoamperometriyi and voltammetry, pulse voltammetry for the current X-ray microanalysis energodispersive, skanivna electron microscopy, atomic adsorption spectroscopy, cyclic voltammetry. Theoretical and practical results: The composition of electrolytes and electrochemical modes to obtain electrodes with nanoparticles Pd-Au, that exhibit catalytic activity in the reaction of anodic oxidation of methanol. Scientific novelty: for the first time proposed and used reasonably promising method of obtaining controlled catalytically active nanoparticles Pd-Au electrolysis pulse mode among aprotic organic solvents; For the first time found that the potentials of -0.3 ...- 1.5 V with DMSO solutions of: (0.001M 0.004 ...) M PdCl2 + (0.001 ... 0.004) M H [AuCl4] + 0.05M Bu4NClO4, by pulse 6 Pause - 300 ms at 35 ° palladium and gold spivosadzhuyutsya to form sferopodibnyh Pd-Au particles and their agglomerates with a size 50 ... 260 nm; first established that the main parameters influence the composition nanoosadu Pd-Au cathode potential value is the concentration of PdCl2 and H [AuCl4] in solution. With the increase of Ekati. in the range -0.3 -1.5 ... In palladium content in the sediment increases almost linearly; first determined that when forming nanoosadu Pd-Au for each cycle pulse-pause the formation of embryos and their growth, allowing the number of cycles to specify the type of sediment (from discrete particles and their agglomerates to nanofilms) and size of nanoparticles; for the first time found that the co-precipitation of palladium and gold with DMF solutions for galvanic replacement maґniyeviy surface sediments formed Pd-Au with spherical micro and nanoparticles; first discovered the catalytic activity of nanostructured Pd-Au / GC, obtained by electrolysis pulse mode environment DMSO, in the reactions of anodic oxidation of methanol. Degree of implementation: High efficiency catalytically active nanostructured Pd-Au / GC confirmed the test results of LLC "Autonomous power supply" (m. Large Bridges). Tested Pd-Au / GC recommended for use in fuel cells. Scope: nanotechnology, electrochemical technology industries; in research institutes and educational process.