Hydrogen Storage Properties of Magnesium Base Nanostructured Composite Materials Page: 3 of 46
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WSRC-TR-2003-00239
thermodynamic configuration of magnesium hydride. Doping Mg-Ni nano/amorphous
composite materials with lanthanum reduces the hydriding and dehydriding temperature.
Although the stability of MgH2 can not be easily reduced by ball milling alone, the results
suggest the thermodynamic properties of Mg-Ni nano/amorphous composite materials
can be alternated by additives such as La or other effective elements. Further
investigation toward understanding the mechanism of additives will be rewarded.
1. Introduction
Magnesium and its derived alloys are looked upon as promising candidates of hydrogen
storage due to their high theoretical storage capacity (7.6 wt%), light weight and low
cost. However, high operating temperatures and slow kinetics prevent them from
practical application [1-2]. Multi-component Mg base alloys have met with limited
success in increasing kinetic dynamics and lowering the desorption temperatures [3-6].
Efforts to seek new ternary Mg hydrides with favored reaction kinetics and temperature
have not produced promising results [7-9]. A number of reports show that the reaction
kinetics have been accelerated significantly, even at ambient temperature using
nanostrucutred or amorphous Mg based materials synthesized by ball milling or
mechanical alloying [10-12]. Unfortunately, the desorption temperature of the studied Mg
based materials was still too high to be used practically. In most cases, it required at least
250 C to liberate hydrogen from magnesium hydrides. To explore the possibility and2
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AU, M. Hydrogen Storage Properties of Magnesium Base Nanostructured Composite Materials, article, April 30, 2004; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc781808/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.