Phase transition and lattice expansion during hydrogen loading of nanometer sized palladium clusters

Solid Solutions of Hydrogen in Complex Materials

“…However, in this case stresses will develop during hydrogen loading like in thin films and, therefore, the pc-isotherms will be affected by these stresses. The interaction of hydrogen with free palladium clusters of 2 to 6 nm diameter which were stabilized by a surfactant shell has been described in detail in recent studies [164,168,169]. The results are summarized as follows.…”

“…The behavior of hydrogen in samples with reduced dimensions is one of the more recent areas of research in metal-hydrogen systems [20,158,159,160,161,162,163,164,165,166,167,168,169,170]. The properties of these systems are affected by the proximity of surfaces or interfaces providing additional sites to the DOSE.…”

Inhomogeneous Phase Transition upon Hydrogenation of Nanocluster Pd Films

“…The question remains as to how the b-phase palladium is distributed within the nanocluster: uniformly or as a core-shell structure as proposed by Suleiman et al? [12] In this model, the hydrogenated shell does not exhibit b-phase properties. Hydrogen concentration and the optical transmission transients during hydrogen desorption provide information about the hydrogen concentration as a function of the distance from the nanocluster core.…”

“…Changes in the solubility could also be the result of sorption in sub-surface sites. Although Suleiman et al [12] proposed that only the core of the nanocluster is involved in the phase transition, thereby considerably reducing the amount of b-phase palladium, evidence for the hypothesis is lacking. Herein, we show the presence of a core-shell structure and consider two questions: 1) To what extent does the shell absorb hydrogen?…”

Molecular Dynamics Study of the Particle Size Dependency of Structural Change in Hydrogenated Model f.c.c. Nanoparticles

“…Hydrogen absorption in nanoparticles has been studied for many years, mainly on Pd. [1][2][3][4][5][6][7][8][9][10][11] Pundt and coworkers 6,7) showed that the crystal structure of hydrogenated Pd nanoparticles varies depending on the cluster size. It includes not only the equilibrium and 0 phases in the f.c.c.…”