Hydrogen adsorption and desorption in different carbon materials were determined at 77 and 296K. Superactivated carbon having specific surface area of 3220m 2 /g, adsorbed and desorbed 5wt.% of hydrogen at 77K and 1.3wt.% of hydrogen at 296K. 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 6kJ/mol H 2 .