Hydrogen adsorption studies on single wall carbon nanotubes

摘要

Hydrogen adsorption data on as-grown and heat-treated single walled carbon nanotubes(SWNTs)obtained by a volumetric procedure using a Quantachrome Autosorb-1 equipment are presented.The amounts of hydrogen adsorbed at atmospheric pressure reach approximately 0.01 wt. at 298 K and 1 wt. at 77 K.The isosteric heat of adsorption has been calculated for both samples from H_2 equilibrium adsorption data at three temperatures,having initial values of 7.42 and 7.75 kJ mol~(-1).Studies in porous structure by N_2 adsorption and density measurements in helium pycnometer are reported.