Hyperstoichiometric hydrogen storage in monodispersed palladium nanoparticles

Transient hydrogen adsorption profile of Pd nanoparticles measured at RT and an equilibrium hydrogen pressure of 1.7 MPa. Maximum hydrogen storage capacity observed is 1.05 ± 0.01 wt%. Re-adsorption of hydrogen provided in the lower profile corresponds to the hydrogen storage in the room-temperature out-gassed samples measured under aforementioned conditions. Only negligible loss of the reversible hydrogen storage capacity is observed while re-adsorption. Inset provides the hydrogen storage in these samples for extended storage duration of 9 h.