Hydrogen diffusion through Ru thin films. (26th May 2020)

• Record Type: Journal Article
• Authors: Soroka, O.; Sturm, J.M.; Lee, C.J.; Schreuders, H.; Dam, B.; Bijkerk, F.
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 29(2020)
• Page Start: 15003
• Page End: 15010
• Publication Date: 2020-05-26
• Subjects: Hydrogen diffusion -- Ruthenium -- Yttrium -- Optical transmission -- Activation energy; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.03.201
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: 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 m 2 /s ∙ exp (-0.33 eV/ k B τ ), with k B the Boltzmann constant and τ the temperature. Graphical abstract: Image 1 Highlights: 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.