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

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F)
OSTI Identifier:
1502345
Report Number(s):
NREL/JA-5900-73499
Journal ID: ISSN 1439-4235
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
ChemPhysChem
Additional Journal Information:
Journal Volume: 20; Journal Issue: 10; Journal ID: ISSN 1439-4235
Publisher:
ChemPubSoc Europe
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; magnesium borohydride; magnesium diboride; hydrogen storage; modifiers and additives; structural defects

Citation Formats

Sugai, Cody, Kim, Stephen, Severa, Godwin, White, James L., Leick, Noemi, Martinez, Madison B., Gennett, Thomas, Stavila, Vitalie, and Jensen, Craig. Kinetic Enhancement of Direct Hydrogenation of MgB2 to Mg(BH4)2 upon Mechanical Milling with THF, MgH2, and/or Mg. United States: N. p., 2019. Web. doi:10.1002/cphc.201801187.
Sugai, Cody, Kim, Stephen, Severa, Godwin, White, James L., Leick, Noemi, Martinez, Madison B., Gennett, Thomas, Stavila, Vitalie, & Jensen, Craig. Kinetic Enhancement of Direct Hydrogenation of MgB2 to Mg(BH4)2 upon Mechanical Milling with THF, MgH2, and/or Mg. United States. doi:10.1002/cphc.201801187.
Sugai, Cody, Kim, Stephen, Severa, Godwin, White, James L., Leick, Noemi, Martinez, Madison B., Gennett, Thomas, Stavila, Vitalie, and Jensen, Craig. Thu . "Kinetic Enhancement of Direct Hydrogenation of MgB2 to Mg(BH4)2 upon Mechanical Milling with THF, MgH2, and/or Mg". United States. doi:10.1002/cphc.201801187. https://www.osti.gov/servlets/purl/1502345.
@article{osti_1502345,
title = {Kinetic Enhancement of Direct Hydrogenation of MgB2 to Mg(BH4)2 upon Mechanical Milling with THF, MgH2, and/or Mg},
author = {Sugai, Cody and Kim, Stephen and Severa, Godwin and White, James L. and Leick, Noemi and Martinez, Madison B. and Gennett, Thomas and Stavila, Vitalie and Jensen, Craig},
abstractNote = {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.},
doi = {10.1002/cphc.201801187},
journal = {ChemPhysChem},
number = 10,
volume = 20,
place = {United States},
year = {2019},
month = {3}
}

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