Ordered mesoporous carbon, referred to as CMK-3, was synthesized by replication from SBA-15. Activated CMK-3 with developed pore structures provided a large surface area and higher hydrogen adsorption capacities after KOH activation at 1073-1223 K. To characterize the pore structure of the activated samples, N-2 and H-2 adsorption were measured at 77 K. The hydrogen adsorption of activated CMK-3 increased to 2.26 wt.% at an activation temperature of 1173 K due to the formation of micropores. Thus, KOH activation was not only one of the most effective methods for developing porosity, but also raised the hydrogen storage capacity of CMK-3. (C) 2012 Elsevier B.V. All rights reserved.