The Influence of a Crystallographically Atypical Pentagonal Nanostructured Coating on the Limiting Stage of Low-Temperature Hydrogen Transport through Pd–Cu Membranes.

Autor: Petriev, I. S., Pushankina, P. D., Lutsenko, I. S., Baryshev, M. G.
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Zdroj: Doklady Physics; Aug2021, Vol. 66 Issue 8, p209-213, 5p
Abstrakt: A new approach to the acceleration of the surface processes of hydrogen transport through Pd–40%Cu membranes by depositing a developed catalytic coating consisting of nanoparticles with a novel crystallographically atypical pentagonal structure is demonstrated. The number of localized potentially more active regions of the membrane surface increases significantly due to the presence of high-index facets with a large number of reactive undercoordinated atoms in such particles. This modification leads to a shift of the limiting stage, significantly accelerating the recombinative desorption on the surface, and to an increase in the influence of the diffusion stage. This improves the gas transport characteristics of the membrane, making it possible to achieve permeability of up to 8.9 mmol s−1 m−2 in the low-temperature mode (up to 100°C). The value obtained is up to sixfold higher than the corresponding value for smooth membranes and up to twofold higher for membranes modified with classical palladium black. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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