Hydrogen Storage as K-H Salt on PD(100) Surface

The influence of potassium on the adsorption of hydrogen on palladium has been studied by various electron spectroscopic methods, such as Auger-, ultraviolet photoelectron work function measurements and mass spectroscopy. Under ultrahigh vacuum condition a direct interaction between hydrogen atoms and Pd(100) surface was observed in the adsorbed layer. The electronic transport from potassium to the adsorbed hydrogen atoms resulted in a ca. 50–60 K higher desorption from the surface. In contrary, the dissociation of molecular hydrogen is hindered by the presence of K atoms; in harmony with the dissociative adsorption steps on transition metal surfaces.