Structures of hydrided palladium at interfaces: Evidence of subsurface quasi-β(α') phase hydride formation at very low hydrogen chemical potentials at 25 °C

Studies at 25 °C of changes of the electrode potential of palladium electrodes coated with palladium black during hydrogen absorption at low rates have revealed a feature which appears to be related to other evidence of subsurface absorption of hydrogen by palladium at much lower hydrogen potentials than the main region of α→β phase transition in the Pd-H system. Implications of these findings are discussed.