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Thermodynamics and reaction pathways of hydrogen sorption in Mg6(Pd,TM) (TM = Ag, Cu and Ni) pseudo-binary compounds

AuthorsPonthieu, M.; Fernández, J. F.; Cuevas, F.; Bodega, J.; Ares, José R.; Adeva, Paloma; Sánchez, C.
KeywordsMetal hydrides
Thermodynamic properties
Mg-based intermetallics
Hydrogen storage
Issue Date2014
CitationInternational Journal of Hydrogen Energy 39 (32): 18291-18301 (2014)
Abstract© 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Mg6(Pd,TM) (TM = Ag, Cu and Ni) pseudo-binary compounds have been synthesized at the TM solubility limit to determine the influence of TM on the thermodynamics and reaction pathways of the Mg6Pd-H system. All compounds exhibit a two-plateau pressure behaviour, being the value of the high plateau pressure well above that of the Mg/MgH2 system. Such destabilization is explained by the formation of different Mg-(Pd,TM) intermetallics and/or Mg2NiH4 hydride phases during the hydrogenation reaction. The formation of these phases not only increases the enthalpy of hydrogenation but also enhances disorder leading to a limited destabilization of the hydrogenated state. This compensation effect is characterized by a linear correlation between enthalpy and entropy terms. In addition, this work also provides the assessment at 623 K of the ternary Mg-Pd-Cu phase diagram in the Mg-rich corner.
Identifiersdoi: 10.1016/j.ijhydene.2014.09.034
issn: 0360-3199
Appears in Collections:(CENIM) Artículos
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