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

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

(Graph Presented). Here we report direct physical evidence that confinement of molecular hydrogen (H2) 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 H2 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.

carbon, hydrogen storage, nanoporous materials, neutron scattering
1936-0851
8249-8254
Ting, Valeska P.
d4381878-2aad-4a3f-a7cc-021a7f7075eb
Ramirez-Cuesta, Anibal J.
34895c52-7d2f-4576-8da7-8b326efb6fbd
Bimbo, Nuno
53d9fc24-e2c1-4e2d-8d75-8dc640d8adda
Sharpe, Jessica E.
c8f4c69d-b116-49d1-ab40-71a5807b6a59
Noguera-Diaz, Antonio
bea37c4d-bae4-4946-98b4-9a3c367d94e4
Presser, Volker
b7743f2f-a34a-4f48-a284-af18391b5040
Rudic, Svemir
c31a432a-294b-4dc8-98c5-71e59bf06854
Mays, Timothy J.
d02351c7-1d8f-4a9e-8d16-675c1f7b3635
Ting, Valeska P.
d4381878-2aad-4a3f-a7cc-021a7f7075eb
Ramirez-Cuesta, Anibal J.
34895c52-7d2f-4576-8da7-8b326efb6fbd
Bimbo, Nuno
53d9fc24-e2c1-4e2d-8d75-8dc640d8adda
Sharpe, Jessica E.
c8f4c69d-b116-49d1-ab40-71a5807b6a59
Noguera-Diaz, Antonio
bea37c4d-bae4-4946-98b4-9a3c367d94e4
Presser, Volker
b7743f2f-a34a-4f48-a284-af18391b5040
Rudic, Svemir
c31a432a-294b-4dc8-98c5-71e59bf06854
Mays, Timothy J.
d02351c7-1d8f-4a9e-8d16-675c1f7b3635

Ting, Valeska P., Ramirez-Cuesta, Anibal J., Bimbo, Nuno, Sharpe, Jessica E., Noguera-Diaz, Antonio, Presser, Volker, Rudic, Svemir and Mays, Timothy J. (2015) Direct evidence for solid-like hydrogen in a nanoporous carbon hydrogen storage material at supercritical temperatures. ACS Nano, 9 (8), 8249-8254. (doi:10.1021/acsnano.5b02623).

Record type: Article

Abstract

(Graph Presented). Here we report direct physical evidence that confinement of molecular hydrogen (H2) 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 H2 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.

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More information

Accepted/In Press date: 14 July 2015
e-pub ahead of print date: 23 July 2015
Published date: 25 August 2015
Keywords: carbon, hydrogen storage, nanoporous materials, neutron scattering

Identifiers

Local EPrints ID: 435207
URI: http://eprints.soton.ac.uk/id/eprint/435207
ISSN: 1936-0851
PURE UUID: 7c39f3e7-26ff-4f26-b5a5-2339577dd9f2
ORCID for Nuno Bimbo: ORCID iD orcid.org/0000-0001-8740-8284

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Date deposited: 25 Oct 2019 16:30
Last modified: 07 Oct 2020 02:26

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Contributors

Author: Valeska P. Ting
Author: Anibal J. Ramirez-Cuesta
Author: Nuno Bimbo ORCID iD
Author: Jessica E. Sharpe
Author: Antonio Noguera-Diaz
Author: Volker Presser
Author: Svemir Rudic
Author: Timothy J. Mays

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