Critical size and surface effect of the hydrogen interaction of palladium clusters
Physikalisches Institut, Universität Freiburg, 1700 Freiburg, Switzerland
2 Institut für Anorganische Chemie, Universität GH-Essen, 45117 Essen, Germany
Revised: 10 May 1999
Published online: 15 February 2000
Metal hydrides are used for electrochemical or gaseous storage of hydrogen because considerable amounts of hydrogen are reversibly absorbed and desorbed at interstitial sites. Palladium is often used as a model system. Nanophase material is of interest because properties related to the hydrogen absorption are size dependent. In this study, clusters from the size of 55 to 1415 atoms are investigated and compared with bulk Pd. It turns out that not only the amount of hydrogen per palladium that can be intercalated changes but also kinetics and chemical potentials are dependent on the cluster size. The clusters used for this study were chemically synthesised and stabilised by a ligand shell.
PACS: 61.43.Gt – Powders, porous materials / 61.10.Nz – Single-crystal and powder diffraction / 64.90.+b – Other topics in equations of state, phase equilibria, and phase transitions dynamics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000