A Porous Tungsten Substrate for Catalytic Reduction of Hydrogen by Dealloying of a Tungsten–Rhenium Alloy in an Aqueous Solution of Hydrochloric Acid

Chernyshev, A. A.; Никитина, Е. В.

doi:10.3390/app12031029

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…The relevance of the technology for the production of highly porous refractory materials is discussed in the literature regarding the problem of catalysts [72][73][74][75][76][77][78]. The materials with a highly porous nanostructure described above and the method of their preparation by plasma irradiation have the potential for use as catalysts in the production of hydrogen.…”

Section: Advantages Of Practical Applicationsmentioning

confidence: 99%

Heat Transfer on Micro and Nanostructured Rough Surfaces Synthesized by Plasma

Дедов

Budaev

2022

Symmetry

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The review summarizes recent experimental results of studying heat transfer on rough surfaces synthesized by plasma. The plasma-surface interaction leads to the stochastic clustering of the surface roughness with a high specific area breaking the symmetry of the virgin surface of the initial crystalline materials. Such a surface is qualitatively different from the ordinary Brownian surface. The micro- and nanostructured surface consist of pores, craters, and nanofibers of size from tens of nanometers to tens of microns, which can provide new heat transfer properties related to a violation of the symmetry of the initial materials. In recent years, new results have been obtained in the study of heat transfer during phase change on plasma-modified surfaces in relation to energy, chemical, and cryogenic technologies. The objective of the review is to describe the specific structure of refractory metals after high-temperature plasma irradiation and the potential application of plasma processing of materials in order to create heat exchange surfaces that provide a significant intensification of two-phase heat transfer. Refractory metals with such a highly porous rough surface can be used as plasma-facing components for operation under extreme heat and plasma loads in thermonuclear and nuclear reactors, as catalysts for hydrogen production, as well as in biotechnology and biomedical applications.

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Section: Advantages Of Practical Applicationsmentioning

confidence: 99%

Heat Transfer on Micro and Nanostructured Rough Surfaces Synthesized by Plasma

Дедов

Budaev

2022

Symmetry

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“…The method of rhenium oxides and/or potassium and ammonium perrhenates reduction by hydrogen is the most common [ 5 , 6 ]. Rhenium-based coatings may be obtained by the electrolysis of aqueous solutions of perrhenates and chlorrhenates [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. Despite their drawbacks, the described methods are widely used.…”

Section: Introductionmentioning

confidence: 99%

Rhenium Electrodeposition and Its Electrochemical Behavior in Molten KF-KBF4-B2O3-KReO4

et al. 2022

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The electrochemical behavior of rhenium ions in the molten KF-KBF4-B2O3 salt was systematically studied, and pure metallic rhenium was obtained at the cathode. The processes of rhenium ions reduction and diffusion in molten KF-KBF4-B2O3 were determined using cyclic voltammetry, stationary galvanostatic and polarization curves analyses. The values of diffusion coefficients were 3.15 × 10−5 cm2/s and 4.61 × 10−5 cm2/s for R1 and R2, respectively. Rhenium electrodeposition was carried out at a constant potential. The process of rhenium cathode reduction in KF-KBF4-B2O3 at 773 K was found to be a one-step reaction Re(VII) → Re, and rhenium electrodeposition presumably occurred from two types of complex rhenium ions (KReO4 and K3ReO5). Both processes are quasi-reversible and controlled by diffusion. The obtained cathode deposit was analyzed by SEM, EDX, ICP-OES and XRD methods. The obtained deposit had a thread structure and rhenium was the main component.

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