Hydrogen confinement in carbon nanopores: Extreme densification at ambient temperature

Nidia C. Gallego; Lilin He; Dipendu Saha; Cristian I. Contescu; Yuri B. Melnichenko

doi:10.1021/ja202432x

Hydrogen confinement in carbon nanopores: Extreme densification at ambient temperature

Nidia C. Gallego, Lilin He, Dipendu Saha, Cristian I. Contescu, Yuri B. Melnichenko

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71 Scopus citations

Abstract

In-situ small-angle neutron scattering studies of H₂ confined in small pores of polyfurfuryl alcohol-derived activated carbon at room temperature have provided for the first time its phase behavior in equilibrium with external H₂ at pressures up to 200 bar. The data were used to evaluate the density of the adsorbed fluid, which appears to be a function of both pore size and pressure and is comparable to the density of liquid H ₂ in narrow nanopores at ∼200 bar. The surface-molecule interactions responsible for densification of H₂ within the pores create internal pressures that exceed the external gas pressure by a factor of up to ∼50, confirming the benefits of adsorptive storage over compressive storage. These results can be used to guide the development of new carbon adsorbents tailored for maximum H₂ storage capacities at near-ambient temperatures.

Original language	English
Pages (from-to)	13794-13797
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	133
Issue number	35
DOIs	https://doi.org/10.1021/ja202432x
State	Published - Sep 7 2011

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title = "Hydrogen confinement in carbon nanopores: Extreme densification at ambient temperature",

abstract = "In-situ small-angle neutron scattering studies of H2 confined in small pores of polyfurfuryl alcohol-derived activated carbon at room temperature have provided for the first time its phase behavior in equilibrium with external H2 at pressures up to 200 bar. The data were used to evaluate the density of the adsorbed fluid, which appears to be a function of both pore size and pressure and is comparable to the density of liquid H 2 in narrow nanopores at ∼200 bar. The surface-molecule interactions responsible for densification of H2 within the pores create internal pressures that exceed the external gas pressure by a factor of up to ∼50, confirming the benefits of adsorptive storage over compressive storage. These results can be used to guide the development of new carbon adsorbents tailored for maximum H2 storage capacities at near-ambient temperatures.",

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T1 - Hydrogen confinement in carbon nanopores

T2 - Extreme densification at ambient temperature

AU - Gallego, Nidia C.

AU - He, Lilin

AU - Saha, Dipendu

AU - Contescu, Cristian I.

AU - Melnichenko, Yuri B.

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AB - In-situ small-angle neutron scattering studies of H2 confined in small pores of polyfurfuryl alcohol-derived activated carbon at room temperature have provided for the first time its phase behavior in equilibrium with external H2 at pressures up to 200 bar. The data were used to evaluate the density of the adsorbed fluid, which appears to be a function of both pore size and pressure and is comparable to the density of liquid H 2 in narrow nanopores at ∼200 bar. The surface-molecule interactions responsible for densification of H2 within the pores create internal pressures that exceed the external gas pressure by a factor of up to ∼50, confirming the benefits of adsorptive storage over compressive storage. These results can be used to guide the development of new carbon adsorbents tailored for maximum H2 storage capacities at near-ambient temperatures.

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Hydrogen confinement in carbon nanopores: Extreme densification at ambient temperature

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