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Pore size distribution and supercritical hydrogen adsorption in activated carbon fibers

Purewal, J. J. and Kabbour, H. and Vajo, J. J. and Ahn, C. C. and Fultz, B. (2009) Pore size distribution and supercritical hydrogen adsorption in activated carbon fibers. Nanotechnology, 20 (20). p. 204012. ISSN 0957-4484.

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Pore size distributions (PSD) and supercritical H_2 isotherms have been measured for two activated carbon fiber (ACF) samples. The surface area and the PSD both depend on the degree of activation to which the ACF has been exposed. The low-surface-area ACF has a narrow PSD centered at 0.5 nm, while the high-surface-area ACF has a broad distribution of pore widths between 0.5 and 2 nm. The H_2 adsorption enthalpy in the zero-coverage limit depends on the relative abundance of the smallest pores relative to the larger pores. Measurements of the H_2 isosteric adsorption enthalpy indicate the presence of energy heterogeneity in both ACF samples. Additional measurements on a microporous, coconut-derived activated carbon are presented for reference.

Item Type:Article
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URLURL TypeDescription
Vajo, J. J.0000-0002-6271-4899
Fultz, B.0000-0002-6364-8782
Additional Information:© 2009 IOP Publishing Ltd. Received 1 October 2008, in final form 25 November 2008. Published 23 April 2009. We thank A Dailly for useful discussions. Work was funded by the DOE Office of Energy Efficiency and Renewable Energy through DE-FC36-05GO15079. Collaboration for this work was through the Center of Excellence on Carbon-Based Hydrogen Storage Materials.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FC36-05GO15079
Issue or Number:20
Record Number:CaltechAUTHORS:20090727-112832709
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14672
Deposited By: Tony Diaz
Deposited On:07 Aug 2009 23:35
Last Modified:09 Mar 2020 13:19

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