Direct Evidence for Solid-like Hydrogen in a Nanoporous Carbon Hydrogen Storage Material at Supercritical Temperatures [electronic resource]
Carbon; Hydrogen Storage; Nanoporous Materials; Neutron Scattering.
Saved in:
| Online Access: |
Online Access (via OSTI) |
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| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. Office of Basic Energy Sciences ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2015.
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| Subjects: |
| Summary: | Carbon; Hydrogen Storage; Nanoporous Materials; Neutron Scattering. |
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| Abstract: | Here in this paper we report direct physical evidence that confinement of molecular hydrogen (H<sub>2</sub>) in an optimized nanoporous carbon results in accumulation of hydrogen with characteristics commensurate with solid H<sub>2</sub> at temperatures up to 67 K above the liquid vapor critical temperature of bulk H<sub>2</sub>. 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 H<sub>2</sub> 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 H<sub>2</sub> challenges the existing assumption that supercritical hydrogen confined in nanopores has an upper limit of liquid H<sub>2</sub> 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. |
| Item Description: | Published through SciTech Connect. 07/14/2015. ACS Nano 9 8 ISSN 1936-0851 AM. Valeska P. Ting; Anibal J. Ramirez-Cuesta; Nuno Bimbo; Jessica E. Sharpe; Antonio Noguera-Diaz; Volker Presser; Svemir Rudic; Timothy J. Mays. |
| Physical Description: | p. 8249-8254 : digital, PDF file. |