2024-03-19T06:30:11Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1134992022-03-24T11:13:39Zcom_10261_66com_10261_3col_10261_319
Ponthieu, M.
Fernández, J. F.
Cuevas, Fermín
Bodega, J.
Ares, José R.
Adeva, Paloma
Sánchez, C.
2015-04-10T10:16:49Z
2015-04-10T10:16:49Z
2014
International Journal of Hydrogen Energy 39 (32): 18291-18301 (2014)
http://hdl.handle.net/10261/113499
10.1016/j.ijhydene.2014.09.034
© 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.
eng
closedAccess
Metal hydrides
Thermodynamic properties
Mg-based intermetallics
Hydrogen storage
Thermodynamics and reaction pathways of hydrogen sorption in Mg6(Pd,TM) (TM = Ag, Cu and Ni) pseudo-binary compounds
artículo