Photoemission studies of LaNi/sub 5-x/Cu/sub x/ alloys and relation to hydride formation

Journal Article · Thu Dec 09 04:00:00 EST 1982 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100222a026· OSTI ID:6468350

Wallace, W E; Pourarian, F

Photoemission studies of LaNi/sub 5-x/Cu/sub x/, with x ranging from 0 to 5, show Cu and Ni d bands clearly separated by about 2 eV. The band in LaNi/sub 5/ closely resembles that of elemental Ni, and the d band in LaCu/sub 5/ closely resembles that of elemental Cu. The photoemission results have been successfully used to interpret trends in hydriding behavior of LaNi/sub 5/ as Ni is progressively replaced by Cu, viz., the decrease in capacity and the decrease in hydrogen vapor pressure. Analysis of the hydrogen-metal bonding in these systems indicates that, while a partially empty d band is necessary for reasonable hydrogen storage capacity in a metal, there is an additional requirement to produce exothermal hydrogenation and hence extensive hydrogen solubility. The additional requirement is that the d band must be located properly on the energy scale.

• Research Organization: Univ. of Pittsburgh, PA
• OSTI ID: 6468350
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:25; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080201* -- Hydrogen-- Chemisorption Storage
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ADSORPTION
ALLOYS
CHEMICAL REACTIONS
COPPER ALLOYS
ELEMENTS
EMISSION
HYDROGEN
HYDROGENATION
INTERMETALLIC COMPOUNDS
LANTHANUM ALLOYS
NICKEL ALLOYS
NONMETALS
PHOTOEMISSION
RARE EARTH ALLOYS
SECONDARY EMISSION
SORPTION