Kinetic Enhancement of Direct Hydrogenation of MgB2 to Mg(BH4)2 upon Mechanical Milling with THF, MgH2, and/or Mg

Cody Sugai, Stephen Kim, Godwin Severa, James L. White, Noemi Leick, Madison B. Martinez, Thomas Gennett, Vitalie Stavila, Craig Jensen

Research output: Contribution to journalArticlepeer-review

21 Scopus Citations

Abstract

Modification of magnesium diboride, MgB 2 , by mechanical milling with THF, MgH 2 , and/or Mg results in a lowering of the conditions required for its direct, bulk hydrogenation to magnesium borohydride, Mg(BH 4 ) 2 , by 300 bar and 100 °C. Following mechanical milling with MgH 2 or THF and Mg, MgB 2 can be hydrogenated to Mg(BH 4 ) 2 at 300 °C under 700 bar of H 2 while achieving ∼54–71 % conversion to the borohydride. The discovery of a means of dramatically lowering the conditions required for the hydrogenation of MgB 2 is an important step towards the development of a practical onboard hydrogen storage system based on hydrogen cycling between Mg(BH 4 ) 2 and MgB 2 . We suggest that mechano-milling with THF, Mg, and/or MgH 2 may possibly introduce defects in the MgB 2 structure which enhance hydrogenation. The ability to activate the MgB 2 through the introduction of structural defects transcends its relevance to hydrogen storage, as a method of overcoming its chemical inertness provides the key to harnessing other interesting properties of this material.

Original languageAmerican English
Pages (from-to)1301-1304
Number of pages4
JournalChemPhysChem
Volume20
Issue number10
DOIs
StatePublished - 2019

Bibliographical note

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

NREL Publication Number

  • NREL/JA-5900-73499

Keywords

  • hydrogen storage
  • magnesium borohydride
  • magnesium diboride
  • modifiers and additives
  • structural defects

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