Hydrogen diffusion through Ru thin films

In this paper, an experimental measurement of the diffusion constant of hydrogen in ruthenium is presented. By using a hydrogen indicative Y layer, placed under the Ru layer, the hydrogen flux through Ru was obtained by measuring the optical changes in the Y layer. We use optical transmission measur...

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Bibliographic Details
Published in:International journal of hydrogen energy 2020-05, Vol.45 (29), p.15003-15010
Main Authors: Soroka, O., Sturm, J.M., Lee, C.J., Schreuders, H., Dam, B., Bijkerk, F.
Format: Article
Language:English
Subjects:
Activation energy
Hydrogen diffusion
Optical transmission
Ruthenium
Yttrium
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Summary:In this paper, an experimental measurement of the diffusion constant of hydrogen in ruthenium is presented. By using a hydrogen indicative Y layer, placed under the Ru layer, the hydrogen flux through Ru was obtained by measuring the optical changes in the Y layer. We use optical transmission measurements to obtain the hydrogenation rate of Y in a temperature range from room temperature to 100 °C. We show that the measured hydrogenation rate is limited mainly by the hydrogen diffusion in Ru. These measurements were used to estimate the diffusion coefficient, D, and activation energy of hydrogen diffusion in Ru thin films to be D = 5.9 × 10−14 m2/s ∙ exp (-0.33 eV/kBτ), with kB the Boltzmann constant and τ the temperature. [Display omitted] •Hydrogen diffusion through Ru films was studied.•Optical monitoring in transmission is used, with Y as H sensitive layer.•Pd capping layer ensures that H diffusion through Ru is limiting for H transport.•Diffusion constant and activation energy obtained in range 25–100 °C.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2020.03.201