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Small-pore hydridic frameworks store densely packed hydrogen

  • Hyunchul Oh
  • , Nikolay Tumanov
  • , Voraksmy Ban
  • , Xiao Li
  • , Bo Richter
  • , Matthew R. Hudson
  • , Craig M. Brown
  • , Gail N. Iles
  • , Dirk Wallacher
  • , Scott W. Jorgensen
  • , Luke Daemen
  • , Rafael Balderas-Xicohténcatl
  • , Yongqiang Cheng
  • , Anibal J. Ramirez-Cuesta
  • , Michael Heere
  • , Sergio Posada-Pérez
  • , Geoffroy Hautier
  • , Michael Hirscher
  • , Torben R. Jensen
  • , Yaroslav Filinchuk
  • Ulsan National Institute of Science and Technology
  • Université catholique de Louvain
  • Aarhus University
  • National Institute of Standards and Technology
  • Helmholtz Centre Berlin for Materials and Energy
  • Royal Melbourne Institute of Technology University
  • General Motors
  • Hyrax intercontinental
  • Oak Ridge National Laboratory
  • Technical University of Munich
  • Technical University of Braunschweig
  • Dartmouth College
  • Max Planck Institute for Intelligent Systems
  • Tohoku University

Research output: Contribution to journalScientific articlepeer-review

35 Citations (Scopus)

Abstract

Nanoporous materials have attracted great attention for gas storage, but achieving high volumetric storage capacity remains a challenge. Here, by using neutron powder diffraction, volumetric gas adsorption, inelastic neutron scattering and first-principles calculations, we investigate a magnesium borohydride framework that has small pores and a partially negatively charged non-flat interior for hydrogen and nitrogen uptake. Hydrogen and nitrogen occupy distinctly different adsorption sites in the pores, with very different limiting capacities of 2.33 H2 and 0.66 N2 per Mg(BH4)2. Molecular hydrogen is packed extremely densely, with about twice the density of liquid hydrogen (144 g H2 per litre of pore volume). We found a penta-dihydrogen cluster where H2 molecules in one position have rotational freedom, whereas H2 molecules in another position have a well-defined orientation and a directional interaction with the framework. This study reveals that densely packed hydrogen can be stabilized in small-pore materials at ambient pressures. (Figure presented.)

Original languageEnglish
Pages (from-to)809-816
Number of pages8
JournalNature Chemistry
Volume16
Issue number5
DOIs
Publication statusPublished - May 2024

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