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Direct evidence for solid-like hydrogen in a nanoporous carbon hydrogen storage material at supercritical temperatures

Research output: Contribution to journalJournal article

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  • Valeska P. Ting
  • Anibal J. Ramirez-Cuesta
  • Nuno Bimbo
  • Jessica E. Sharpe
  • Antonio Noguera-Diaz
  • Volker Presser
  • Svemir Rudic
  • Timothy J. Mays
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<mark>Journal publication date</mark>08/2015
<mark>Journal</mark>ACS Nano
Issue number8
Volume9
Number of pages6
Pages (from-to)8249-8254
Publication statusPublished
Early online date14/07/15
Original languageEnglish

Abstract

Here we report direct physical evidence that confinement of molecular hydrogen (H-2) in an optimized nanoporous carbon results in accumulation of hydrogen with characteristics commensurate with solid H2 at temperatures up to 67 K above the liquid vapor critical temperature of bulk H2. This extreme densification is attributed to confinement of 112 molecules in the optimally sized micropores, and occurs at pressures as low as 0.02 MPa. The quantities of contained, solid-like H2 increased with pressure and were directly evaluated using in situ inelastic neutron scattering and confirmed by analysis of gas sorption isotherms. The demonstration of the existence of solid-like H2 challenges the existing assumption that supercritical hydrogen confined in nanopores has an upper limit of liquid H2 density. Thus, this insight offers opportunities for the development of more accurate models for the evaluation and design of nanoporous materials for high capacity adsorptive hydrogen storage.