Accepted author manuscript, 1.09 MB, PDF document
Available under license: CC BY: Creative Commons Attribution 4.0 International License
Rights statement: This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Final published version, 1.96 MB, PDF document
Available under license: CC BY: Creative Commons Attribution 4.0 International License
Final published version
Licence: CC BY: Creative Commons Attribution 4.0 International License
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Direct evidence for solid-like hydrogen in a nanoporous carbon hydrogen storage material at supercritical temperatures
AU - Ting, Valeska P.
AU - Ramirez-Cuesta, Anibal J.
AU - Bimbo, Nuno
AU - Sharpe, Jessica E.
AU - Noguera-Diaz, Antonio
AU - Presser, Volker
AU - Rudic, Svemir
AU - Mays, Timothy J.
PY - 2015/8
Y1 - 2015/8
N2 - 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.
AB - 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.
KW - nanoporous materials
KW - hydrogen storage
KW - carbon
KW - neutron scattering
KW - METAL-ORGANIC FRAMEWORKS
KW - INELASTIC NEUTRON-SCATTERING
KW - CARBIDE-DERIVED CARBONS
KW - H-2 ADSORPTION
KW - POROUS CARBONS
KW - PORE-SIZE
KW - DIFFRACTION
KW - NANOTUBES
KW - PERFORMANCE
KW - POROSITY
U2 - 10.1021/acsnano.5b02623
DO - 10.1021/acsnano.5b02623
M3 - Journal article
VL - 9
SP - 8249
EP - 8254
JO - ACS Nano
JF - ACS Nano
SN - 1936-0851
IS - 8
ER -