An electrochemical technique was used to study H diffusion in various Pd-Rh alloys (table 153). At small H contents, the diffusion parameters were independent of the H concentration. The presence of small amounts of Rh led to a decrease in the diffusion coefficients. This decrease was attributed to an increase in the activation energy for the diffusion of interstitial H in these alloys.

Diffusion of Hydrogen in Rhodium-Palladium Alloys. D.Artman, T.B.Flanagan: Journal of Physical Chemistry, 1973, 77[23], 2804-7

Table 153

Parameters for Interstitial H Diffusion in Rh-Pd at 30 to 240C