Enhancement of hydrogen storage capacity of carbon nanotubes via spill-over from vanadium and palladium nanoparticles

Zacharia, Renju; Kim, Keun Young; Kibria, A.K.M. Fazle; Nahm, Kee Suk

doi:10.1016/j.cplett.2005.07.020

Cited by 211 publications

(127 citation statements)

References 28 publications

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“…However, a number of experiments indicate that doping porous carbon materials (nanotubes, nanofibers, nanoporous carbons) with metallic clusters or nanoparticles could provide a strategy to increase the hydrogen uptake. [18][19][20][21][22][23][24][25][26] The metals mostly used in those investigations are alkali metals 18,19 and some transition metals like vanadium, palladium, and platinum. [22][23][24][25][26][27] To explain the observed enhancement of the hydrogen adsorption, a mechanism of spillover 28,29 has generally been assumed.…”

Section: Introductionmentioning

confidence: 99%

“…[18][19][20][21][22][23][24][25][26] The metals mostly used in those investigations are alkali metals 18,19 and some transition metals like vanadium, palladium, and platinum. [22][23][24][25][26][27] To explain the observed enhancement of the hydrogen adsorption, a mechanism of spillover 28,29 has generally been assumed. [22][23][24][25][26][27]30,31 In that mechanism, the hydrogen molecules are first adsorbed and dissociated on the surface of the metallic nanoparticles, and are next transported onto the surface of the substrate carbon material.…”

Section: Introductionmentioning

confidence: 99%

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Is Spillover Relevant for Hydrogen Adsorption and Storage in Porous Carbons Doped with Palladium Nanoparticles?

et al. 2016

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Experiments have shown that the efficiency of nanoporous carbons to store hydrogen becomes enhanced by doping the material with metallic nanoparticles. In particular, doping with palladium has been used with success. The hypothesis to justify the enhancement has been that the Pd nanoparticles dissociate the hydrogen molecules and then the hydrogen atoms spill over the carbon substrate, where the hydrogen is retained. To test this hypothesis we have performed ab initio molecular dynamics simulations of the deposition of molecular hydrogen on Pd nanoparticles (Pd 6 and Pd 13 ) supported on graphene, which is a good model for the wall of a carbon nanopore. Three channels have been identified in the simulations: bouncing off the molecule, molecular adsorption, and dissociation of the molecule in two H atoms. The relative percentage of those channels is sensitive to the size of the Pd particle. Dissociation occurs more frequently on Pd 13 and it generally takes place on the lateral regions of the Pd particles.However, in our simulations we have not found a single case of H atoms or H 2 molecules spilling over the carbon substrate. We have also tested the situation when several H atoms are preadsorbed on the Pd 6 and Pd 13 particles and found that not a single dissociation event occurs on these H-saturated nanoparticles. These results lead us to cast strong doubts on the validity of the spillover mechanism for explaining the enhancement of hydrogen adsorption on porous carbons doped with transition metal nanoparticles.2

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Is Spillover Relevant for Hydrogen Adsorption and Storage in Porous Carbons Doped with Palladium Nanoparticles?

et al. 2016

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“…Transition or alkali metal-doped CNTs, with s-p-d hybridization served to reinforce the notable increase in hydrogen storage via a spill-over mechanism (Yang et al, 2006a;Zacharia et al, 2007). A nearly 30% increase in hydrogen storage capacity was reported for palladium and vanadium doped CNTs at 2 MPa under room temperature (Zacharia et al, 2005). Schaller et al (2009) reinforced magnesiumnickel (Mg-23.5wt% Ni) with CNT by a powder metallurgy method and reported a hydrogen storage as high as 6.1wt%.…”

Section: Carbon Nanotubes In Renewable Energymentioning

confidence: 99%

A review on carbon nanotubes in an environmental protection and green engineering perspective

Ong¹,

Ahmad²,

Zein³

et al. 2010

Braz. J. Chem. Eng.

164

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-Recent developments in nanotechnologies have helped to benchmark carbon nanotubes (CNTs) as one of the most studied nanomaterials. By taking advantages of CNTs extraordinary physical, chemical and electronic properties, a wide variety of applications has been proposed in various engineering fields. In this short review, the contribution of CNTs is addressed in terms of sustainable environment and green technologies perspective, such as waste water treatment, air pollution monitoring, biotechnologies, renewable energy technologies, supercapacitors and green nanocomposites. Consideration of CNTs for large scale application from the aspect of cost and potential hazards are also discussed. Based on the literature studied, CNTs pose a great potential as a promising material for application in various environmental fields.

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“…Molecular orbital calculations suggest that the binding energy is higher for larger tube diameters, exterior tube surface, and for zig-zag SWNT. Zacharia et al [190] observed a 30% higher value of hydrogen capacity in CNTs doped with Pd and V as compared to pristine CNTs at 20 bar pressure and room temperature. The metal particles enhanced storage capacity by spillover.…”

Section: Carbon and Carbon-based Nanostructuresmentioning

confidence: 99%

“…29 Schematic illustration of the spillover mechanism (after: [188]) Fig. 30 TEM image of a palladium nanoparticle trapped inside doped CNT (reprinted from [190], copyright (2005) with permission from Elsevier) Fig. 31 (a) The design for a nanocontainer, with the cap and the ball (C60) together serving as a molecular valve that traps the hydrogen after the release of the external pressure.…”

Section: Carbon and Carbon-based Nanostructuresmentioning

confidence: 99%

Advances in the application of nanotechnology in enabling a ‘hydrogen economy’

2008

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Hydrogen is gaining a great deal of attention as an energy carrier as well as an alternative fuel. However, in order to fully implement the so called 'hydrogen economy' significant technical challenges need to be overcome in the fields of production and storage of hydrogen and its point of use especially in fuel cells for the automotive industry. The purpose of this review is to present and discuss recent advances in the use of nanomaterials for solar hydrogen production and on-board solid state storage of hydrogen. The role of nanotechnology in enhancing the efficiency of fuel cells and reducing their cost is also discussed.

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Enhancement of hydrogen storage capacity of carbon nanotubes via spill-over from vanadium and palladium nanoparticles

Cited by 211 publications

References 28 publications

Is Spillover Relevant for Hydrogen Adsorption and Storage in Porous Carbons Doped with Palladium Nanoparticles?

Is Spillover Relevant for Hydrogen Adsorption and Storage in Porous Carbons Doped with Palladium Nanoparticles?

A review on carbon nanotubes in an environmental protection and green engineering perspective

Advances in the application of nanotechnology in enabling a ‘hydrogen economy’

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