Effect of additives on hydrogen release reactivity of magnesium hydride composites

E. Markman, L. Luzzatto-Shukrun, Y. S. Levy, I. Pri-Bar, Y. Gelbstein

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Magnesium hydride, a compound potentially applicable as a hydrogen carrier and energy storage material, releases hydrogen via hydrolysis or thermolysis. Ball-milled MgH2 composites were studied to optimize the kinetics and yield of the dehydriding process. Milling MgH2, under inert atmosphere increased the susceptibility to oxidation: the amount of MgO produced following air exposure of pulverized MgH2 was found to be proportional to the milling duration. Incorporation of protective coatings to avoid undesirable oxidation was studied: addition of anionic surfactants or expanded graphite as milling aids reduces the susceptibility of MgH2 to oxidation, presumably via formation of a protective layer. Such coatings minimize the access of oxygen to the particle surface upon exposure to air and facilitate manipulations, such as performing analysis, under ambient atmosphere. Improved dehydriding efficiency of oxidation-protected milled composites was demonstrated. Hydrolysis of pristine magnesium hydride and MgH2-composites with aqueous hydrolysates containing aprotic polar solvents demonstrated a significant increase of dehydriding efficiency.

Original languageEnglish
Pages (from-to)31381-31394
Number of pages14
JournalInternational Journal of Hydrogen Energy
Volume47
Issue number73
DOIs
StatePublished - 26 Aug 2022

Keywords

  • Ball-milled magnesium hydride composites
  • Hydrolysates containing aprotic polar solvents
  • MgH dehydriding kinetics
  • MgH surface air oxidation
  • Surfactant and expanded graphite milling-aid additives

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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