Zacharia , R. and Kim , K. Y. and Kibria , A. K. M. F. and Nahm , K. S. (2005) Enhancement of hydrogen storage capacity of carbon nanotubes via spill-over from vanadium and palladium nanoparticles. CHEMICAL PHYSICS LETTERS, 412 (4-6). 369-375 . ISSN 0009-2614
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The hydrogen storage capacities of palladium- and vanadium-doped carbon nanotubes (CNTs) at room temperature were investigated using the Sieverts apparatus. The storage capacity of Pd- and V-doped CNTs at 2 MPa were found to be 0.66 and 0.69 wt%, which are nearly 30% more than that of the pristine-CNTs. Also, the doped-CNTs exhibited faster initial hydrogen adsorption kinetics when compared with the pristine samples. The compensation of hydrogen storage by the metal particles in the doped-CNTs reveals that metal particles enhance the storage capacity via the spill-over mechanism. The re-adsorption studies of previously adsorbed samples suggested that nearly 70-85% of the spilled hydrogen occupies the physisorption binding sites, such as external-walls or groove-sites of CNTs. (c) 2005 Elsevier B.V. All rights reserved.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||19 Oct 2010 06:40|
|Last Modified:||19 Oct 2010 06:40|
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