The diffusivity of H at temperatures of between 299 and 322.5K was measured by using an electrochemical method, and uncoated or Pd-coated Cu foils (table 16). These data, and previous results, indicated that there was no deviation from the classical Arrhenius behavior at temperatures of between 1200 and 300K.

The Diffusivity of Hydrogen in Copper at Low Temperatures. T.Ishikawa, R.B.McLellan: Journal of Physics and Chemistry of Solids, 1985, 46[4], 445-7