Adsorption properties of N2, H2 on single-walled carbon nanotubes modified by KOH

Adsorption properties of N2, H2 on SWNTs was studied by varying the KOH-modification temperature. The structure change of SWNTs through KOH-modification was investigated by using N2 adsorption at 77 K. Hydrogen adsorption of the as-received SWNT and SWNT-x was performed using a volumetric apparatus at 77 K. The total surface area and micropore volume increased, while the average pore width, w, decreased, as the KOH-modification temperature decreased. The micropore structure in SWNTs was destroyed at high KOH-modification temperature. The amount of N2, H2 adsorbed depended strongly on the temperature of modification and was inversely proportional to that temperature.