The effects of the electrical parameters, surface roughness, surface contamination, and electrolyte concentration (NaOH or H2SO4) upon the permeation rate of H through a Pd membrane (0.05mm) were reported. Diffusion measurements were carried out by using an electrochemical permeation cell under transient conditions. It was found that the diffusion of H and D, at 5 to 50C, could be described by the expressions:

H:     D (cm2/s) = 0.00248 exp[-5.21(kcal/mol)/RT]

D:     D (cm2/s) = 0.00167 exp[-4.83(kcal/mol)/RT]

The diffusivities of H and D at 298K were equal to 3.8 x 10-7 and 4.8 x 10-7cm2/s, respectively.

R.V.Bucur: Zeitschrift für Physikalische Chemie, 1985, 146[2], 217-29