Hydrogen permeability and erosion behavior of W–Pd bimetallic systems

Glazunov, G. P.; Андреев, А. А.; Baron, D.I.; Causey, R.A.; Hassanein, A.; Kitayevskiy, K.M.; Konotopskiy, A.L.; Lapshin, V. I.; Neklyudov, I. M.; Patokin, A. P.; Surkov, A.E.; Волков, Е. Д.

doi:10.1016/j.fusengdes.2005.08.034

Cited by 1 publication

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“…An important consideration for choosing low-energy hydrogen plasma as the activation method was in the high permeation of hydrogen/deuterium combined with the retention of the plasma properties along the sample width. It was shown that hydrogen and deuterium molecules keep their highly vibrational excited states while passing from the outermost nanoparticles in the web to the innermost ones. − This process should guarantee that most of the NPs in the powder batch face similarly excited hydrogen molecules and undergo the same plasma treatment. This phenomenon is of particular importance, ensuring homogeneous distribution of the adsorbed hydrogen through the exposed powder samples.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Chemical Configuration and Thermal Stability in Tungsten Disulfide Nanoparticles Exposed to Hydrogen Plasma

et al. 2017

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The chemical configuration and interaction mechanism of hydrogen adsorbed in inorganic nanoparticles of WS are investigated. Our recent approaches of using hydrogen activated by either microwave or radiofrequency plasma dramatically increased the efficiency of its adsorption on the nanoparticles surface. In the current work we make an emphasis on elucidation of the chemical configuration of the adsorbed hydrogen. This configuration is of primary importance as it affects its adsorption stability and possibility of release. To get insight on the chemical configuration, we combined the experimental analysis methods with theoretical modeling based on the density functional theory (DFT). Micro-Raman spectroscopy was used as a primary tool to elucidate chemical bonding of hydrogen and to distinguish between chemi- and physisorption. Hydrogen adsorbed in molecular form (H) was clearly identified in all the plasma-hydrogenated WS nanoparticles samples. It was shown that the adsorbed hydrogen is generally stable under high vacuum conditions at room temperature, which implies its stability at the ambient atmosphere. A DFT model was developed to simulate the adsorption of hydrogen in the WS nanoparticles. This model considers various adsorption sites and identifies the preferential locations of the adsorbed hydrogen in several WS structures, demonstrating good concordance between theory and experiment and providing tools for optimizing of hydrogen exposure conditions and the type of substrate materials.

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Section: Introductionmentioning

confidence: 99%