Monitoring phase behavior of hydrogen confined in carbon nanopores by in-situ small angle neutron scattering technique

Hongxin Zhang; Lilin He; Yuri B. Melnichenko; Cristian I. Contescu; Nidia C. Gallego

doi:10.1557/opl.2012.1284

Monitoring phase behavior of hydrogen confined in carbon nanopores by in-situ small angle neutron scattering technique

Hongxin Zhang, Lilin He, Yuri B. Melnichenko, Cristian I. Contescu, Nidia C. Gallego

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

We report on the use of in-situ small angle neutron scattering (SANS) technique to study the phase behavior of hydrogen confined in narrow pores of ultramicroporous carbon (UMC) with a very large surface area (2630 m ²/g) and pore volume (1.3 cm³/g). The effect of pore size and pressure on hydrogen adsorbed on UMC at room temperature and pressures up to ∼200 bar were investigated. In a previous experiment, we have measured the density of adsorbed H₂ gas in the nanopores and mesopores of polyfurfuryl alcohol-derived activated carbon (PFAC) by SANS technique. Here, a comparative SANS study between the UMC and PFAC was conducted in order to further investigate the densification of H₂ as a function of pore size and pressure. Initial results suggest that the density of confined H ₂ in both UMC and PFAC is considerably higher than that of the bulk hydrogen gas. The density is systematically higher in the narrow pores and decreases with increasing pore size. These results clearly demonstrate the advantage of adsorptive storage over compressed gas storage and emphasize the greater efficiency of micropores over mesopores in the adsorption process, which can be used to guide the development of new carbon adsorbents tailored for maximum H₂ storage capacities at near-ambient temperatures.

Original language	English
Title of host publication	Next-Generation Energy Storage Materials and Systems
Pages	37-43
Number of pages	7
DOIs	https://doi.org/10.1557/opl.2012.1284
State	Published - 2012
Event	2012 MRS Spring Meeting - San Francisco, CA, United States Duration: Apr 9 2012 → Apr 13 2012

Publication series

Name	Materials Research Society Symposium Proceedings
Volume	1440
ISSN (Print)	0272-9172

Conference

Conference	2012 MRS Spring Meeting
Country/Territory	United States
City	San Francisco, CA
Period	04/9/12 → 04/13/12

Funding

This research was supported by the Materials Science and Engineering Division, Office of Basic Energy Sciences, U.S. Department of Energy. SANS experiments were conducted at ORNL’s High Flux Isotope Reactor (HFIR) supported by the Scientific Users Facility Division, Office of Basic Energy Sciences, U.S. Department of Energy. H.Z. and L.H. acknowledge ORISE/ORNL postdoctoral program.

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10.1557/opl.2012.1284

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Zhang, H., He, L., Melnichenko, Y. B., Contescu, C. I., & Gallego, N. C. (2012). Monitoring phase behavior of hydrogen confined in carbon nanopores by in-situ small angle neutron scattering technique. In Next-Generation Energy Storage Materials and Systems (pp. 37-43). (Materials Research Society Symposium Proceedings; Vol. 1440). https://doi.org/10.1557/opl.2012.1284

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title = "Monitoring phase behavior of hydrogen confined in carbon nanopores by in-situ small angle neutron scattering technique",

abstract = "We report on the use of in-situ small angle neutron scattering (SANS) technique to study the phase behavior of hydrogen confined in narrow pores of ultramicroporous carbon (UMC) with a very large surface area (2630 m 2/g) and pore volume (1.3 cm3/g). The effect of pore size and pressure on hydrogen adsorbed on UMC at room temperature and pressures up to ∼200 bar were investigated. In a previous experiment, we have measured the density of adsorbed H2 gas in the nanopores and mesopores of polyfurfuryl alcohol-derived activated carbon (PFAC) by SANS technique. Here, a comparative SANS study between the UMC and PFAC was conducted in order to further investigate the densification of H2 as a function of pore size and pressure. Initial results suggest that the density of confined H 2 in both UMC and PFAC is considerably higher than that of the bulk hydrogen gas. The density is systematically higher in the narrow pores and decreases with increasing pore size. These results clearly demonstrate the advantage of adsorptive storage over compressed gas storage and emphasize the greater efficiency of micropores over mesopores in the adsorption process, which can be used to guide the development of new carbon adsorbents tailored for maximum H2 storage capacities at near-ambient temperatures.",

author = "Hongxin Zhang and Lilin He and Melnichenko, \{Yuri B.\} and Contescu, \{Cristian I.\} and Gallego, \{Nidia C.\}",

year = "2012",

doi = "10.1557/opl.2012.1284",

language = "English",

isbn = "9781627482431",

series = "Materials Research Society Symposium Proceedings",

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booktitle = "Next-Generation Energy Storage Materials and Systems",

note = "2012 MRS Spring Meeting ; Conference date: 09-04-2012 Through 13-04-2012",

}

Zhang, H, He, L, Melnichenko, YB, Contescu, CI & Gallego, NC 2012, Monitoring phase behavior of hydrogen confined in carbon nanopores by in-situ small angle neutron scattering technique. in Next-Generation Energy Storage Materials and Systems. Materials Research Society Symposium Proceedings, vol. 1440, pp. 37-43, 2012 MRS Spring Meeting, San Francisco, CA, United States, 04/9/12. https://doi.org/10.1557/opl.2012.1284

Monitoring phase behavior of hydrogen confined in carbon nanopores by in-situ small angle neutron scattering technique. / Zhang, Hongxin; He, Lilin; Melnichenko, Yuri B. et al.
Next-Generation Energy Storage Materials and Systems. 2012. p. 37-43 (Materials Research Society Symposium Proceedings; Vol. 1440).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - Monitoring phase behavior of hydrogen confined in carbon nanopores by in-situ small angle neutron scattering technique

AU - Zhang, Hongxin

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AU - Contescu, Cristian I.

AU - Gallego, Nidia C.

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N2 - We report on the use of in-situ small angle neutron scattering (SANS) technique to study the phase behavior of hydrogen confined in narrow pores of ultramicroporous carbon (UMC) with a very large surface area (2630 m 2/g) and pore volume (1.3 cm3/g). The effect of pore size and pressure on hydrogen adsorbed on UMC at room temperature and pressures up to ∼200 bar were investigated. In a previous experiment, we have measured the density of adsorbed H2 gas in the nanopores and mesopores of polyfurfuryl alcohol-derived activated carbon (PFAC) by SANS technique. Here, a comparative SANS study between the UMC and PFAC was conducted in order to further investigate the densification of H2 as a function of pore size and pressure. Initial results suggest that the density of confined H 2 in both UMC and PFAC is considerably higher than that of the bulk hydrogen gas. The density is systematically higher in the narrow pores and decreases with increasing pore size. These results clearly demonstrate the advantage of adsorptive storage over compressed gas storage and emphasize the greater efficiency of micropores over mesopores in the adsorption process, which can be used to guide the development of new carbon adsorbents tailored for maximum H2 storage capacities at near-ambient temperatures.

AB - We report on the use of in-situ small angle neutron scattering (SANS) technique to study the phase behavior of hydrogen confined in narrow pores of ultramicroporous carbon (UMC) with a very large surface area (2630 m 2/g) and pore volume (1.3 cm3/g). The effect of pore size and pressure on hydrogen adsorbed on UMC at room temperature and pressures up to ∼200 bar were investigated. In a previous experiment, we have measured the density of adsorbed H2 gas in the nanopores and mesopores of polyfurfuryl alcohol-derived activated carbon (PFAC) by SANS technique. Here, a comparative SANS study between the UMC and PFAC was conducted in order to further investigate the densification of H2 as a function of pore size and pressure. Initial results suggest that the density of confined H 2 in both UMC and PFAC is considerably higher than that of the bulk hydrogen gas. The density is systematically higher in the narrow pores and decreases with increasing pore size. These results clearly demonstrate the advantage of adsorptive storage over compressed gas storage and emphasize the greater efficiency of micropores over mesopores in the adsorption process, which 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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SN - 9781627482431

T3 - Materials Research Society Symposium Proceedings

SP - 37

EP - 43

BT - Next-Generation Energy Storage Materials and Systems

T2 - 2012 MRS Spring Meeting

Y2 - 9 April 2012 through 13 April 2012

ER -

Monitoring phase behavior of hydrogen confined in carbon nanopores by in-situ small angle neutron scattering technique

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