Browsing by Author "Velichenko, Oleksandr В."

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    Design, Fabrication and Functional Properties of Titanium Suboxide-Based Composites With Low Noble Metal Content for Electrocatalytic Applications
    (Journal of Electrochemical Science and Engineering, 2025) Knysh, Valentina О.; Zhemela, Heorhii; Shmychkova, Olesia B.; Luk'yanenko, Tatiana V.; Velichenko, Oleksandr В.
    ENG: Fabrication, design and investigation of functional properties of composite materials based on titanium suboxides with low noble metal content for use in electrocatalysis has been investigated. The study particularly focuses on electrode coatings derived from titanium dioxide modified with platinum and palladium. The structural, electrocatalytic, and corrosion-resistant properties of these materials were systematically investigated. It was demonstrated that thermal treatment significantly enhances the catalytic efficiency of the coatings by reducing the oxygen evolution overpotential and improving the efficiency of hypochlorite synthesis. Optimal thermal treatment conditions (500 °C, 3 hours) were identi-fied, resulting in increased stability of the anodes containing Pt and Pd layers, as evidenced by a service life of 176 hours. The study highlights the potential of these composites for applications in oxygen evolution reactions and hypochlorite synthesis, owing to their high stability, selectivity, and cost-effectiveness.
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    New Electrode Materials for Aluminum Production
    (Ukrainian State University of Science and Technologies, 2025) Husarova, I.O.; Omelchuk, A.O.; Grigoriev, O.M.; Kraiev, M.V.; Velichenko, Oleksandr В.
    ENG: The successful development and implementation of inert anodes in the aluminum industry could significantly reduce or even completely eliminate greenhouse gas emissions. The search for suitable inert anode materials with the necessary combination of properties remains an active area of research. Currently, three main classes of materials are being considered: ceramics, metal-ceramics, and metals. This study aims to develop a new type of composite ceramic material for use as inert anodes in the electrolytic reduction of alumina. Based on an analysis of the requirements for inert anodes in aluminum electrolysis, the oxidation-resistant and conductive ZrB2–MoSi2 composite ceramic is proposed for operation within the required temperature range. It has been demonstrated that these anodes exhibit inert behavior toward atomic oxygen and can operate stably in atomic oxygen atmospheres at temperatures up to 20000C. Furthermore, the feasibility of applying a protective ZrB2–MoSi2 coating to conventional carbon anodes via vacuum arc deposition has been experimentally confirmed. The use of non-consumable anodes with ZrB2–MoSi2 protective coatings is also proposed for the direct electrolysis of lunar regolith at 16000C, enabling oxygen and metal extraction on the Moon.