Hydrogen storage in aligned carbon nanotubes

Abstract

Articles you may be interested inHydrogen storage for carbon nanotubes synthesized by the pyrolysis method using lanthanum nickel alloy as catalyst J. Appl. Phys. 94, 6417 (2003); 10.1063/1.1621082Theoretical evaluation of hydrogen storage capacity in pure carbon nanostructures Aligned carbon nanotubes ͑CNTs͒ with diameters of 50-100 nm, synthesized by plasma-assisted hot filament chemical vapor deposition, were employed for hydrogen adsorption experiments in their as-prepared and pretreated states. Quadruple mass spectroscopy and thermogravimetric analysis show a hydrogen storage capacity of 5-7 wt% was achieved reproducibly at room temperature under modest pressure ͑10 atm͒ for the as-prepared samples. Pretreatments, which include heating the samples to 300°C and removing of the catalyst tips, can increase the hydrogen storage capacity up to 13 wt% and decrease the pressure required for storage. The weight gains were measured after the samples moved out of the hydrogen environment. The release of the adsorbed hydrogen can be achieved by heating the samples up to 300°C.

Hydrogen storage in carbon nanotubes and related materials

“…This value is considerably less than that reported by Chen et al 10 who studied the desorption of hydrogen using thermogravimetric analysis and reported a value of 5-7 wt% at around 10 atm. The present value is to be compared to that of Cao et al 22 who reported a hydrogen storage of 2.4 wt% at slightly lower pressures of around 100 bar.…”

“…Hydrogen is expected to be stored between the graphite layers as well as in the pores formed by the internanotube space between adjacent parallel nanotubes. 10,22 We expect that if the catalyst can be removed, hydrogen would also be stored in the hollow center of the tubes, which is the storage mechanism for SWNTs.…”

Enhancement of hydrogen physisorption on single-walled carbon nanotubes resulting from defects created by carbon bombardment

“…[2][3][4] A high capacity of hydrogen uptake at room temperature and 110 atm in multiwalled carbon nanotubes ͑MWNTs͒ was also reported. [5][6][7] In contrast to these reported promising results, other experimental measurements gave very discouraging results of hydrogen storage capacity in all examined carbon nanostructures, including SWNTs and MWNTs at room temperature. [8][9][10][11][12] Hydrogen storage in carbon nanotubes at low temperature and high pressure may be more suitable for obtaining higher hydrogen storage capacity.…”

Interactions between Carbon Nanomaterials and Biomolecules

“…Chen et al 47 utilized the aligned CNT for hydrogen adsorption study at room temperature under 10 atm pressure. The capacity of storage could only get 5-7 wt , which is much smaller than the computational study, but the pretreatment by heating samples to 300 could increase storage capacity up to 13 wt .…”