Formation of a super-dense hydrogen monolayer on mesoporous silica

Rafael Balderas-Xicohténcatl, Hung Hsuan Lin, Christian Lurz, Luke Daemen, Yongqiang Cheng, Katie Cychosz Struckhoff, Remy Guillet-Nicolas, Gisela Schütz, Thomas Heine, Anibal J. Ramirez-Cuesta, Matthias Thommes, Michael Hirscher

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Adsorption on various adsorbents of hydrogen and helium at temperatures close to their boiling points shows, in some cases, unusually high monolayer capacities. The microscopic nature of these adsorbate phases at low temperatures has, however, remained challenging to characterize. Here, using high-resolution cryo-adsorption studies together with characterization by inelastic neutron scattering vibration spectroscopy, we show that, near its boiling point (~20 K), H2 adsorbed on a well-ordered mesoporous silica forms a two-dimensional monolayer with a density more than twice that of bulk-solid H2, rather than a bilayer. Theoretical studies, based on thorough first-principles calculations, rationalize the formation of such a super-dense phase. The strong compression of the hydrogen surface layer is due to the excess of surface–hydrogen attraction over intermolecular hydrogen repulsion. Use of this super-dense hydrogen monolayer on an adsorbent might be a feasible option for the storage of hydrogen near its boiling point, compared with adsorption at 77 K.

Original languageEnglish
Pages (from-to)1319-1324
Number of pages6
JournalNature chemistry
Volume14
Issue number11
DOIs
Publication statusPublished - 2022 Nov

Bibliographical note

Publisher Copyright:
© 2022, The Author(s).

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering

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