TRANSPORT OF HYDROGEN THROUGH PALLADIUM-CLAD ELECTRODES

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Abstract
Electrochemical polarization studies of the transport of hydrogen through Pd, Pt, Pd-clad Pt, Au, Ni, and Fe were conducted under conditions of a concentration gradient of either atoms or protons. Transport of hydrogen through an atom concentration gradient was found for Pd and Pd-clad Fe only. Under a proton concentration gradient, protons migrated readily through Pd, but their transfer through Pt was immeasurable unless the Pt was sandwiched between Pd. Transfer of protons through Fe sandwiched between Pd was also found. Hydrogen atoms evidently did not dissolve to a significant extent in Pt, but if protons are introduced from Pd-clad to Pt they can, under the proper conditions, migrate through Pt. The solution and diffusion of hydrogen atoms and also the migration of protons occurred in Fe. Transport of hydrogen, in any form, through Au and Ni was not detected. Considering the electronic configuration of these metals, it was reasonable that proton migration through Au was negligible; however, it was surprising that protons did not migrate through Ni. Reasons for this anomaly are suggested.

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