Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 421, Issue 1-2, Pages 204-208Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2005.09.077
Keywords
hydrogen absorbing materials; gas-solid reaction; transmisson electron microscopy; thermodynamic properties; high-pressure
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Hydrogen adsorption and desorption in different carbon materials were determined at 77 and 296 K. Superactivated carbon having specific surface area of 3220 m(2)/g, adsorbed and desorbed 5 wt.% of hydrogen at 77 K and 1.3 wt.% of hydrogen at 296 K. The values were greater than those of conventional activated carbon, graphite nanofiber and single-walled carbon nanotube. The hydrogen adsorption capacities of the various carbon materials were given as a function of the specific surface area. According to the Clausius-Clapeyron equation, the heat of adsorption of the superactivated carbon was about 6 kJ/mol H-2. (c) 2005 Elsevier B.V. All rights reserved.
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