Abstract
In the course of low- temperature field desorption of hydrogen from palladium surface the occurence of a wide variety of palladium hydrides species as well as hydrogen ions has been detected by using high-resolution pulsed- laser time- of flight atom- probe (PLTFAP) field ion microscope. In this paper both experimental and DFT approach has been undertaken in order to study the interaction of hydrogen with palladium surface leading to the formation of palladium hydrides in the interstitial positions within two metal layers. The influence of a homogeneous external electric field of the order of several tens V/nm on the hydrogen/palladium surface binding energy has been examined. On the basis of the obtained results it can be stated that in the presence of an external field the palladium-hydrogen bonds become stronger with the maximum binding energy value at the electric field strength of 25 V/nm. On the other hand in the existence of an external field decreasing of activation energy required for hydrogen diffusion into the subsurface is observed.
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