Synthesis of KOH-activated porous carbon materials and study of hydrogen adsorption

► We examine the hydrogen storage capacity of KOH activated carbon species. ► Hydrogen storage capacity is affected by micropore size. ► Around 0.9-1.3 nm micropore is suitable for hydrogen storage at ambient temperatures. ► The highest hydrogen adsorption for an activated carbon is 1.1 mass% at 303 K/30 MPa.