Improving Hydrogen Release under Fuel-Cell Conditions

  • ChemPubSoc Europe Logo
  • Author: ChemPhysChem
  • Published Date: 13 August 2019
  • Source / Publisher: ChemPhysChem/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Improving Hydrogen Release under Fuel-Cell Conditions

Related Societies

Magnesium borohydride, Mg(BH4)2, is one of the few hydrogen storage materials which could meet all the performance requirements for practical, on-board fuel-cell applications. However, overcoming the extremely slow kinetics of reversible hydrogen release is challenging.


Godwin Severa, Craig Jensen, University of Hawaii at Manoa, Honolulu, USA, and colleagues have developed a magnesium-boride-based material that is highly activated towards hydrogenation. The material could enable efficient hydrogen cycling of magnesium boride (MgB2) to Mg(BH4)2 under fuel-cell-relevant conditions. The hydrogenation of MgB2 to Mg(BH4)2 has previously been achieved only at the forcing conditions of 900 bar and 400 °C.


The team showed that mechanical milling of MgB2 with additives such as tetrahydrofuran (THF), magnesium, and/or magnesium hydride results in a significant improvement of the kinetics of its bulk hydrogenation. This allows the desired transformation to be accomplished at 300 °C under 700 bar H2—the mildest conditions reported so far for this reaction—while achieving 54–71 % conversion to Mg(BH4)2. The team suggests that milling with the additives could introduce defects in the MgB2 structure which enhance hydrogenation.


 

Article Views: 386

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH