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2004
Equilibria
E 4000
50- 013
Altering Hydrogen Storage Properties by Hydride Destabilization Through Alloy
Formation: LiH and MgH2 Destabilized with Si. — Alloy formation with Si occurring upon dehydrogenation destabilizes LiH and MgH2. In the LiH/Si system, a Li2.35Si
alloy forms upon dehydrogenation, causing the equilibrium hydrogen pressure to
increase. In the MgH2/Si system, Mg2Si forms upon dehydrogenation. Thermodynamic
calculations indicate equilibrium pressures of 1 bar at approximately 20 °C and 100 bar
at approximately 150 °C. It is concluded that the MgH2/Si system, with a hydrogen
capacity of 5.0 wt%, could be practical for hydrogen storage at reduced temperatures.
The LiH/Si system is reversible and can be cycled without degradation, whereas the
MgH2/Si system is not readily reversible. The two alloy systems show how hydride
destabilization through alloy formation upon dehydrogenation can be used to design
and control equilibrium pressures of strongly bound hydrides. — (VAJO*, J. J.;
MERTENS, F.; AHN, C. C.; BOWMAN, R. C. J.; FULTZ, B.; J. Phys. Chem. B 108
(2004) 37, 13977-13983; HRL Lab., LLC, Malibu, CA 90265, USA; Eng.) —
W. Pewestorf
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