Molten Salts as a Promising Medium for the Synthesis of Highly Active Catalytic Coatings

Dubrovskiy, Anton; Kuznetsov, S. A.

doi:10.1149/05011.0677ecst

Cited by 5 publications

(7 citation statements)

References 7 publications

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“…In this paper, the attention will be paid only to electrocrystallization of TaO because electrochemical synthesis of nanomaterials [18][19][20] and high-pressure phases 15,21,22 is in the focus of our studies.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Synthesis of Nanomaterials in Molten Salts

Kuznetsov

2017

J. Electrochem. Soc.

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Cathodic processes in the CsCl-K 3 TaOF 6 melt were studied in the temperature range 650-850 • C by cyclic voltammetry. It was shown that electrolysis of the CsCl-K 3 TaOF 6 melt led to the formation of several phases containing tantalum on the molybdenum cathode. The variations of the cathodic products at different concentrations of K 3 TaOF 6 and temperatures were determined. It was found that TaO crystallizes at the cathode as nanoneedles to 1200 nm in length with a cross-section around of 100 nm together with other tantalum compounds. Monoxide of tantalum was obtained by electrolysis of molten salts only at temperatures below 810 • C. Monoxide of tantalum is a high-pressure phase, so it was confirmed once more by electrolytic synthesis of TaO that an effect similar to the action of high pressure occurs during electrolysis.

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Section: Resultsmentioning

confidence: 99%

Electrochemical Synthesis of Nanomaterials in Molten Salts

Kuznetsov

2017

J. Electrochem. Soc.

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“…The preparation of alkali halide salts was described in [12,13]. The salt mixture prepared by the outlined procedure [12,13] was placed in a niobium-lined molybdenum crucible and transferred to the retort of the electrolytic cell.…”

Section: Chemicals and Preparation Of Saltsmentioning

confidence: 99%

“…The salt mixture prepared by the outlined procedure [12,13] was placed in a niobium-lined molybdenum crucible and transferred to the retort of the electrolytic cell. The design of the cell was described in detail in [14].…”

Section: Chemicals and Preparation Of Saltsmentioning

confidence: 99%

Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts

Dubrovskiy¹,

Okunev²,

Макарова³

et al. 2018

Coatings

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Abstract:The interaction of substrates from ceramics, beryllium, and carbopyroceram with the electrolyte for the electrodeposition of niobium coatings was investigated. The corrosion resistance of spherical ceramic and beryllium samples with the protective molybdenum films obtained by magnetron sputtering was studied. The exfoliation of molybdenum film from ceramics and beryllium samples was observed after the experiments due to the interaction of substrates with the melt. It was found that the carbopyroceram did not corrode in the niobium containing melt and this material was chosen as the substrate for the electrodeposition of superconducting niobium coatings. The influence of the oxide ions on the electrochemical behavior of niobium complexes in the NaCl-KCl-NaF-K 2 NbF 7 melt was studied. A special form of the cathode was constructed for the electrodeposition of niobium coatings on spherically shaped substrates. Electrodeposition of the niobium coatings on spheres 10 mm in diameter manufactured from carbopyroceram was carried out at 750 • C with the cathodic current density of 5 × 10 −3 -2 × 10 −2 A·cm −2 and the electrolysis time of 8-12 h. Influence of the cathodic current density on the microstructure of niobium coatings was studied. The roughness, nonsphericity, and superconductive properties of niobium coatings were determined.

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“…Most likely GdB 6 nanotubes formation is ruled by an intercalation mechanism. A new generation of highly active and stable catalytic nanostructured coatings for the water-gas shift reaction by high temperature electrochemical synthesis in molten salts has been developed (2). The steady-state reaction rates for the Mo 2 C/Mo coatings were higher than those for the bulk Mo 2 C and commercial Cu/ZnO/Al 2 O 3 catalysts over in the temperature range explored (2).…”

Section: Introductionmentioning

confidence: 99%

“…A new generation of highly active and stable catalytic nanostructured coatings for the water-gas shift reaction by high temperature electrochemical synthesis in molten salts has been developed (2). The steady-state reaction rates for the Mo 2 C/Mo coatings were higher than those for the bulk Mo 2 C and commercial Cu/ZnO/Al 2 O 3 catalysts over in the temperature range explored (2). Nanoneedles of silicon were obtained in chloride-fluoride melts containing K 2 SiF 6 by potentiostatic electrolysis which accompanied by reaction of disproportionation and nanocoatings of refractory metal carbides on carbon fibers were prepared by currentless transfer (3).…”

Section: Introductionmentioning

confidence: 99%