Hydrogen Storage in Carbon-Based Adsorbents

Active carbon (AC), carbon nanotubes, carbon fibers, and other carbonaceous adsorbents, owing to their low atomic weight, high surface area, pore volume, and suitable mechanical properties, are excellent options as adsorbents for hydrogen storage [81,147,165-184], 

Carbon adsorbs the undissociated hydrogen molecules by repulsion and dispersion forces at then-pore network and surface [2], However, since these binding forces are weak, the physical adsorption process at room temperature is virtually restrained by the thermal motion thus, to store large quantities of hydrogen, the carbon samples have to be cooled [166], However, a cryogenic hydrogen storage technique is, in the majority of cases, economically ineffective [173], 

Hydrogen storage in carbon has been considered during the last few years on account of the existence of new carbon nanomaterials, such as fullerenes, superactivated carbons, carbon monoliths, carbon nanotubes, and carbon nanohoms [147,166,176-179], distinguished by their high adsorption capacities, hydrophobic nature, and high adsorption/desorption rates [170], 

15 wt % at 298 K and 77 K, respectively, which are also higher values compared with other carbon materials [79], 

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