Two electrochemical time-lag methods (step, pulse) were used to investigate the diffusion of hydrogen and deuterium in Pd, Pd-Ag (up to 60%Ag) and Ta. Using simple equipment, the dependence of the diffusion coefficient upon hydrogen concentration - from extremely low pressures up to one atmosphere - could be measured very precisely. The values obtained ranged from 10-6cm2/s in pure Pd to 10-10cm2/s in 40/60 Pd/Ag alloy. The methods were sensitive enough to distinguish differences in the diffusion coefficients of H and D.

Electrochemical Methods for Diffusion Measurements. H.Züchner, N.Boes: Berichte der Bunsengesellschaft für physikalische Chemie, 1972, 76[8], 783-90