Sorption behavior of the MgH2-Mg2FeH6 hydride storage system synthesized by mechanical milling followed by sintering

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Abstract

The hydrogen sorption behavior of the Mg2FeH6-MgH2 hydride system is investigated via in-situ synchrotron and laboratory powder X-ray diffraction (SR-PXD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), particle size distribution (PSD) and volumetric techniques. The Mg2FeH6-MgH2 hydride system is obtained by mechanical milling in argon atmosphere followed by sintering at high temperature and hydrogen pressure. In-situ SR-PXD results show that upon hydriding MgH2 is a precursor for Mg2FeH6 formation and remained as hydrided phase in the obtained material. Diffusion constraints preclude the further formation of Mg2FeH6. Upon dehydriding, our results suggest that MgH2 and Mg2FeH6 decompose independently in a narrow temperature range between 275 and 300 degrees C. Moreover, the decomposition behavior of both hydrides in the Mg2FeH6-MgH2 hydride mixture is influenced by each other via dual synergetic-destabilizing effects. The final hydriding/dehydriding products and therefore the kinetic behavior of the Mg2FeH6-MgH2 hydride system exhibits a strong dependence on the temperature and pressure conditions. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Detaljer

Författare
  • Julian Puszkiel
  • Fabiana Gennari
  • Pierre Arneodo Larochette
  • Fahim Karimi
  • Claudio Pistidda
  • Rapee Gosalawit-Utke
  • Julian Jepsen
  • Torben R. Jensen
  • Carsten Gundlach
  • Jose Bellosta von Colbe
  • Thomas Klassen
  • Martin Dornheim
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fysik
  • Naturvetenskap

Nyckelord

Originalspråkengelska
Sidor (från-till)14618-14630
TidskriftInternational Journal of Hydrogen Energy
Volym38
Utgivningsnummer34
StatusPublished - 2013
PublikationskategoriForskning
Peer review utfördJa