Spillover of physisorbed hydrogen from sputter-deposited arrays of platinum nanoparticles to multi-walled carbon nanotubes

Zacharia, Renju; Rather, Sami‐ullah; Hwang, Sang Woon; Nahm, Kee Suk

doi:10.1016/j.cplett.2006.12.022

Cited by 110 publications

(68 citation statements)

References 20 publications

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“…Interestingly, this is the opposite effect to hydrogen spillover 70 from a nanoparticle to the support suggested by indirect experimental measurements of platinum nanoparticles adsorbed on alumina, 71,72 silica, 73,74 titania, 75 zirconia, 76 zeolite, 77 and carbon-based materials. 78,79 In contrast, the reverse hydrogen spillover found in this work is compatible with DFT and QM/ MM studies of supported six-atom clusters of the metals of groups 8 to 11. 80,81 The new bond-length distributions ( Figure 17) lie between that for an isolated cluster and a cluster adsorbed on a nonterminated armchair edge.…”

Section: Parametrization Of the Reaxffsupporting

confidence: 59%

Molecular Dynamics Simulations of the Interactions between Platinum Clusters and Carbon Platelets

et al. 2008

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Molecular dynamics simulations have been performed with two reactive force fields to investigate the structure of a Pt 100 cluster adsorbed on the three distinct sides of a carbon platelet. A revised Reax force field for the carbon-platinum system is presented. In the simulations, carbon platelet edges both with and without hydrogen termination have been studied. It is found that the initial mismatch between the atomic structure of the platelet egde and the adsorbed face of the Pt 100 cluster leads to a desorption of a few platinum atoms from the cluster and the subsequent restructuring of the cluster. Consequently, the average Pt-Pt bond length is enlarged in agreement with experimental results. This change in the bond length is supposed to play an important role in the enhancement of the catalytic activity, which is demonstrated by studying the changes in the bond order of the platinum atoms. We found an overall shift to lower values as well as a loss of the well-defined peak structure in the bond-order distribution.

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Section: Parametrization Of the Reaxffsupporting

confidence: 59%

Molecular Dynamics Simulations of the Interactions between Platinum Clusters and Carbon Platelets

et al. 2008

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“…This results in lower storage capacity. The same was observed by R. Zacharia [11] in carbon nanotubes. Increase in boria content causes change in textural properties and consequently, platinum locates in micropores, therefore the hydrogen storage capacity is lower.…”

Section: Resultssupporting

confidence: 73%

“…Carbon nanotubes (CNTs) and fullerenes functionalized with the metal adatoms have been emerging as an important genre of composite materials for hydrogen storage applications because of the enhanced storage capacity and improved storage kinetics they exhibit [9,10]. By far the most exclusively studied nanotube-metal composites are those functionalized with transition metals, such as Ti, V, Pd and Pt [11].…”

Section: Introductionmentioning

confidence: 99%

The influence of the small platinum clusters on hydrogen sorption properties

et al. 2017

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Abstract. Hydrogen sorption abilities of Pt-B2O3/Al2O3 systems with different molar ratio of oxides obtained by sol-gel method were examined. Platinum was introduced by surface impregnation. Main goal of the research was to check an influence of metallic component (platinum) on sorption properties of B2O3/Al2O3 binary oxides. The oxide systems were characterized using XRD and TEM. Hydrogen adsorption was tested in the volumetric system and TPD measurements were taken. Results show that the amount of adsorbed hydrogen depends not only on the amount of platinum in the system but also on the type of oxide support and mainly on the content of boria.

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“…In fact, hydrogen physiosorption alone was inadequate to meet the DOE specification; hence, research has focused in the direction of hybrid CNT/metal compounds to promote chemisorption. 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).…”

Section: Carbon Nanotubes In Renewable Energymentioning

confidence: 95%

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

Ong¹,

Ahmad²,

Zein³

et al. 2010

Braz. J. Chem. Eng.

171

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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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Spillover of physisorbed hydrogen from sputter-deposited arrays of platinum nanoparticles to multi-walled carbon nanotubes

Cited by 110 publications

References 20 publications

Molecular Dynamics Simulations of the Interactions between Platinum Clusters and Carbon Platelets

Molecular Dynamics Simulations of the Interactions between Platinum Clusters and Carbon Platelets

The influence of the small platinum clusters on hydrogen sorption properties

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

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