Two-stage electrochemical synthesis of double molybdenum carbides

Synthesis of Refractory Metal Carbides on Carbon Fibers in Molten Salts and Their Electrocatalytic Properties

“…1,2 Carbides of refractory metals are widely used as protective coatings on parts and assembly units in order to reduce the cost of production of these parts made from inexpensive materials, as well as to improve their performance. [3][4][5][6] Refractory metal carbides are also interesting for optical, electronic, magnetic, catalytic, electrocatalytic and other applications. 1 In industry, carbothermal reduction of metal oxides is the most commonly used technique due to the low raw material cost.…”

“…Refractory metal carbides obtained by electrochemical methods have a good adhesion to the substrate, a high wear resistance, good mechanical and other characteristics. [3][4][5] The preparation of tantalum carbide films on carbon-based substrates using the metalliding process (currentless transfer) in the LiF-NaF (60-40 mol%) molten medium containing tantalum heptafluorotantalate complexes TaF 7 2− in the temperature range of 800 °C-900 °C was performed by Massot et al 15 They also synthesized TaC coatings by the electrolytic reduction of carbonate ions CO 3 2− on a tantalum substrate. 16 Massot et al reported that solid diffusion could be facilitated by generating a micro-structured surface to replace the large crystals before the electrochemical reduction of carbon.…”

Synthesis of Refractory Metal Carbides on Carbon Fibers in Molten Salts and Their Electrochemical and Electrocatalytic Properties

“…The disproportionation is accompanied by the formation of metal carbide and metal complexes with the higher oxidation state of m + , where m + = 5 for tantalum and niobium, and m + = 6 for molybdenum. The complexes of the higher oxidation state emerging in the melt due to reaction [2] diffuse to the metal and interact with it [1] with the formation of reduced form complexes. Thus, the process of refractory metal transfer onto the carbon fibers surface closes into a cycle, and the resulting reaction, with account for reactions [1] and [2] can be written as:…”

“…The complexes of the higher oxidation state emerging in the melt due to reaction [2] diffuse to the metal and interact with it [1] with the formation of reduced form complexes. Thus, the process of refractory metal transfer onto the carbon fibers surface closes into a cycle, and the resulting reaction, with account for reactions [1] and [2] can be written as:…”

“…Carbides of refractory metals with a high melting point, heat resistance, high microhardness, etc., are widely used as protective coatings on parts and assembly units in order to improve performance and reduce the production cost of parts made from inexpensive materials (1)(2)(3)(4). Carbides of refractory metals also have catalytic and electrocatalytic properties.…”