The effect of the surface state on the permeation of hydrogen through palladium

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Abstract
The effect of varying surface carbon coverage on the permeation of molecular and atomic hydrogen through palladium was examined. The elemental coverage on one of the Pd surfaces was observed by in situ Auger electron spectroscopy. For molecular permeation the upstream driving pressure ranged from ∼10−3 to 5×102 Pa. For atomic permeation the incident sub-eV atomic flux varied from ∼4×1017 to 3×1020 H0/m2 s. Phenomenological hydrogen transport models were used to determine relative hydrogen recombination and sticking coefficients.

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