Activation of hydrogen storage materials in the Li-Mg-N-H system: Effect on storage properties

Jun Yang*, Andrea Sudik, C. Wolverton

*Corresponding author for this work

Research output: Contribution to journalArticle

59 Scopus citations

Abstract

We investigate the thermodynamics, kinetics, and capacity of the hydrogen storage reaction: Li2Mg(NH)2 + 2H2 ⇔ Mg(NH2)2 + 2LiH. Starting with LiNH2 and MgH2, two distinct procedures have been previously proposed for activating samples to induce the reversible storage reaction. We clarify here the impact of these two activation procedures on the resulting capacity for the Li-Mg-N-H reaction. Additionally, we measure the temperature-dependent kinetic absorption data for this hydrogen storage system. Finally, our experiments confirm the previously reported formation enthalpy (ΔH), hydrogen capacity, and pressure-composition-isotherm (PCI) data, and suggest that this system represents a kinetically (but not thermodynamically) limited system for vehicular on-board storage applications.

Original languageEnglish (US)
Pages (from-to)334-338
Number of pages5
JournalJournal of Alloys and Compounds
Volume430
Issue number1-2
DOIs
StatePublished - Mar 14 2007

Keywords

  • Crystal structure
  • Hydrogen storage
  • Li-Mg-N-H
  • Lithium amide
  • Magnesium hydride
  • Mechanical alloying
  • PCT activation
  • Powder X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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