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

Journal Article · · ChemPhysChem
 [1];  [1];  [1];  [2];  [3];  [3];  [3];  [2];  [1]
  1. Univ. of Hawaii, Honolulu, HI (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
+ Show Author Affiliations

Modification of magnesium diboride, MgB2, by mechanical milling with THF, MgH2, and/or Mg results in a lowering of the conditions required for its direct, bulk hydrogenation to magnesium borohydride, Mg(BH4)2, by 300 bar and 100 degrees C. Following mechanical milling with MgH2 or THF and Mg, MgB2 can be hydrogenated to Mg(BH4)2 at 300 degrees C under 700 bar of H2 while achieving ~54-71% conversion to the borohydride. The discovery of a means of dramatically lowering the conditions required for the hydrogenation of MgB2 is an important step towards the development of a practical onboard hydrogen storage system based on hydrogen cycling between Mg(BH4)2 and MgB2. We suggest that mechano-milling with THF, Mg, and/or MgH2 may possibly introduce defects in the MgB2 structure which enhance hydrogenation. The ability to activate the MgB2 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.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Program (EE-3F)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1502345
Report Number(s):
NREL/JA--5900-73499
Journal Information:
ChemPhysChem, Journal Name: ChemPhysChem Journal Issue: 10 Vol. 20; ISSN 1439-4235
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Catalytic Effect of Facile Synthesized TiH1.971 Nanoparticles on the Hydrogen Storage Properties of MgH2 journal September 2019

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
hydrogen storage
magnesium borohydride
magnesium diboride
modifiers and additives
structural defects