Sorption behavior of the Mg–Fe–H hydrogen storage system
Authors/Creators
- 1. Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany and Científicas y Técnicas (CONICET) and Centro Atómico Bariloche, Av. Bustillo km 9.5, R8402AGP, S. C. de Bariloche, Argentina.
Description
Due to the highest known volumetric hydrogen density (150 kg H2.m-3) and a
gravimetric hydrogen density of 5.4 wt%, Mg2FeH6 is considered a promising material for hydrogen storage. However, because of the absence of intermetallic compounds between Mg and Fe [1], pure Mg2FeH6 is difficult to synthesize. Hydrogen sorption behavior of the Mg–Fe–H system is investigated via synchrotron XRD, DSC and volumetric techniques. Results show that a 2Mg-Fe stoichiometric mixture can not be totally hydrided, a Mg2FeH6–MgH2 hydride mixture is obtained instead. Upon hydriding MgH2 is a precursor for Mg2FeH6. Upon dehydriding MgH2 and Mg2FeH6 decompose independently. The composition and sorption kinetic
behavior of the Mg–Fe–H system depends on the temperature and pressure conditions.
References
[1] T. Massalski, Eds., Binary Alloy Phase Diagrams, 2nd edition, American Society for Metals, Metals Park, OH, 1990.
[2] Puszkiel, J.A., Arneodo Larochette, P., Gennari, F.C., J. Alloys Comp., 463
(2008)134.
Files
Abstract_MH2012_J.Puszkiel.pdf
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