Hydrogen diffusion transfer through an asymmetric three-layer vanadium membrane

Hydrogen diffusion transfer through a three-layer membrane has been studied within the framework of the lattice model under the Bragg‒Williams approximation. A set of equations describing hydrogen transfer through a vanadium membrane coated with thin palladium layers has been derived taking into acc...

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Bibliographic Details
Published inColloid journal of the Russian Academy of Sciences Vol. 79; no. 4; pp. 549 - 555
Main Author Ugrozov, V. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.07.2017
Springer Nature B.V
Subjects
Asymmetry
Chemistry
Chemistry and Materials Science
Diffusion layers
Hydrogen
Hydrogen atoms
Hydrogen embrittlement
Membranes
Palladium
Permeability
Polymer Sciences
Surfaces and Interfaces
Thin Films
Vanadium
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Summary:Hydrogen diffusion transfer through a three-layer membrane has been studied within the framework of the lattice model under the Bragg‒Williams approximation. A set of equations describing hydrogen transfer through a vanadium membrane coated with thin palladium layers has been derived taking into account the interactions of hydrogen atoms in the membrane layers. The obtained equations have been solved using the Mathcad-14 software package. It has been shown that the interaction between hydrogen atoms has a significant influence on hydrogen permeability at near-atmospheric pressures. It has been found that the permeability of the vanadium membrane is markedly higher than that of a palladium one at the same thickness. The effect of asymmetric vanadium membrane embrittlement has been shown to depend on the location of palladium layers with different thicknesses. The embrittlement of the vanadium membrane begins at higher pressures, when a thicker palladium layer is located at the inlet. It has been revealed that, for asymmetric membranes, the value of the diffusion flux of hydrogen atoms may depend on the transfer direction. At the same membrane thickness, the permeability of the asymmetric membrane is actually equal to that of a symmetrical membrane, provided that a thicker palladium layer is located at the inlet. At the opposite orientation, of the permeability of the asymmetric membrane is lower than that of the symmetric one.
ISSN:1061-933X
1608-3067
DOI:10.1134/S1061933X17040160