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  • Impact of surface oxide on hydrogen permeability of chromium membranes [Elektronski vir]
    Nemanič, Vincenc ...
    Hydrogen permeation through pure and oxidised bulk chromium membranes was measured by the classical gas technique to get insight into oxide as a hydrogen permeation barrier (HPB). An additional ... palladium-coated reference chromium membrane was tested to avoid the influence of native Cr oxide. Key parameters for Cr permeability: P0 = 3.23 x 10-7 mol H2/ s/m/Pa0.5 and Ea = 0.68 eV and Cr diffusivity D0 = 9.0 x 10-5 m2 /s and Ea = 0.59 eV. In the sample preparation stage, a thin ~2 nm thick oxide was formed. Additional oxidation in pure oxygen at 400 °C increased the thickness from 20 to 50 nm. At this temperature, its efficiency as HPB was evaluated by comparing permeation rates to the reference chromium membrane. The highest permeation reduction factor of ~3900 corresponded to only a ~28 nm thick Cr oxide layer. Surface morphology and oxide thickness were investigated by SEM, while the thickness and type of chromium oxide by XPS.
    Vir: International journal of hydrogen energy [Elektronski vir]. - ISSN 1879-3487 (Vol. 48, iss. 26, Mar. 2023, str. 9723-9733)
    Vrsta gradiva - e-članek ; neleposlovje za odrasle
    Leto - 2023
    Jezik - angleški
    COBISS.SI-ID - 135652611
    DOI

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