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Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/35393
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Документ Electrode Materials For Hydrogen Energy(CPN Publishing Group, 2022) Nenastina, T. O. ; Sakhnenko, M. D.; Yermolenko, I. S.; Korohodska, A. M.Regularities of cathodic hydrogen evolution on composite electrolytic coatings with Co-Mo-WOx, Co-Mo-ZrO2 and Co-W-ZrO2 alloys are established. The kinetic parameters of the reaction of hydrogen evolution on cobalt alloys, such as the slope coefficients of the Tafel dependences, transfer coefficients, and exchange currents, have been determined. A mechanism for hydrogen evolution on cobalt composite alloys is proposed. The synthesized composite coatings can be recommended as active layers for electrodes used in hydrogen synthesis.Документ Сorrosion behavior of the electrolytic ternary cobalt alloys with Mo(W) and Zr in alkaline solution(Інститут загальної та неорганічної хімії ім. В. І. Вернадського, 2019) Nenastina, T. A.; Ved, M. V.; Sakhnenko, N. D.; Yermolenko, I. Yu.; Proskurina, V. A.; Volobuyev, M. M.The ternary Co–Mo–W(Zr) coatings with total content of refractory metals of 30–40 wt.%, and Co–W–Zr alloys (12–26 wt.%) are deposited from pyrophosphate-citrate electrolytes in pulse regime. The composition of the coatings as well as the surface morphology depends on the current density. The X-ray diffraction patterns reflect the amorphous-and-crystalline ternary alloys structure. Phases of α-Co, Co–Mo intermetallic compounds, and traces of metallic molybdenum were detected in the Co–Mo–Zr coatings. Phase composition of Co–Mo–W deposits differs by emergence of Co₇W₆ phase and traces of metallic tungsten, and there is no metallic W in Co–W–Zr electrolytic alloys. The corrosion behavior of ternary coatings in alkaline medium studied by EIS shows that Co–Mo–Zr alloys are characterized by highest corrosion resistance among deposited coatings due to presence of metallic molybdenum and stoichiometric ZrO₂ with both high electrical resistivity and chemical stability. The coatings Co–Mo–W and Co–Mo–Zr containing phases of Mo or W are characterized by higher corrosion resistance as compared with that without metallic molybdenum and tungsten. The cyclic voltammetry data confirm stability of ternary coatings in alkaline solution under anodic polarization. Such properties as well as the developed globular surface make materials promising for use as anodes in fuel cells in particular based on alkali electrolytes.Документ Functional properties of electrolytic alloys of Cobalt with Molybdenum and Zirconium(Institute for Single Crystals, 2016) Ved, M.; Koziar, M.; Sakhnenko, N. D.; Slavkova, M.Functional electrolytic alloy coatings Co-Mo and Co-Mo-Zr were deposited on substrates steel 3 from polyligand citrate-pyrophosphate bath using pulsed current. It was shown that the alloying components content, their distribution on the surface, morphology and topography of the coatings are depended on the electrolysis energetic parameters. It was established that the functional properties of the binary and ternary electrolytic cobalt alloys (corrosion resistance, catalytic activity in hydrogen evolution and carbon II oxide oxidation) are predetermined by material composition, morphology and relief of the surface. Stability Co-Mn, and Co-Mo-Zr systems in aggressive media due to increased susceptibility to passivity when the molybdenum and zirconium are in the coating is a prerequisite of their use for corrosion protection. The high level of the catalytic properties of Co-Mn, and Co-Mo-Zr associated with different affinities for alloying metals to oxygen and hydrogen evolution mechanism verification allows to recommend them for platinum metals replacement in heterogeneous catalysis.