Hydrogen sorption in orthorhombic Mg hydride at ultra-low temperature

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

37 Scopus Citations
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Author(s)

  • B. Ham
  • A. Junkaew
  • R. Arroyave
  • J. Chen
  • H. Wang
  • P. Wang
  • J. Majewski
  • J. Park
  • H. C. Zhou
  • Ravi K. Arvapally
  • Ushasree Kaipa
  • Mohammad A. Omary
  • X. Y. Zhang
  • X. Zhang

Detail(s)

Original languageEnglish
Pages (from-to)8328-8341
Journal / PublicationInternational Journal of Hydrogen Energy
Volume38
Issue number20
Publication statusPublished - 9 Jul 2013
Externally publishedYes

Abstract

Mg can store up to ∼7 wt.% hydrogen and has great potential as light-weight and low cost hydrogen storage materials. However hydrogen sorption in Mg typically requires ∼573 K, whereas the target operation temperature of fuel cells in automobiles is ∼373 K or less. Here we demonstrate that stress-induced orthorhombic Mg hydride (O-MgH2) is thermodynamically destabilized at ∼ 373 K or lower. Such drastic destabilization arises from large tensile stress in single layer O-MgH2 bonded to rigid substrate, or compressive stress due to large volume change incompatibility in Mg/Nb multilayers. Hydrogen (H2) desorption occurred at room temperature in O-MgH2 10 nm/O-NbH 10 nm multilayers. Ab initio calculations show that constraints imposed by the thin-film environment can significantly reduce hydride formation enthalpy, verifying the experimental observations. These studies provide key insight on the mechanisms that can significantly destabilize Mg hydride and other type of metal hydrides. © Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Research Area(s)

  • Hydrogen sorption, Interface, Orthorhombic Mg hydride, Stress

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Hydrogen sorption in orthorhombic Mg hydride at ultra-low temperature. / Ham, B.; Junkaew, A.; Arroyave, R. et al.
In: International Journal of Hydrogen Energy, Vol. 38, No. 20, 09.07.2013, p. 8328-8341.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review