Growth of helical carbon nanofibers in the presence of Ni−Cu catalysts

Jung, Heon; Lee, Seung Yong; Ahn, Jae Pyoung; Park, Jong-Ku

doi:10.1007/bf03027709

Cited by 4 publications

(4 citation statements)

References 22 publications

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“…It has been noticed that after admixing with NaAlH 4 , the HGNFs are broken into small pieces. However, from the SAED pattern of 2 wt.% HGNF-admixed NaAlH 4 (Figure d), it becomes clear that the configuration of GNF is not completely disturbed upon admixing with NaAlH 4 . , …”

Section: Resultsmentioning

confidence: 96%

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Excellent Catalytic Effects of Graphene Nanofibers on Hydrogen Release of Sodium alanate

et al. 2012

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One of the most technically challenging barriers to the widespread commercialization of hydrogen-fueled devices and vehicles remains hydrogen storage. More environmentally friendly and effective nonmetal catalysts are required to improve hydrogen sorption. In this paper, through a combination of experiment and theory, we evaluate and explore the catalytic effects of layered graphene nanofibers toward hydrogen release of light metal hydrides such as sodium alanate. Graphene nanofibers, especially the helical kind, are found to considerably improve hydrogen release from NaAlH4, which is of significance for the further enhancement of this practical material for environmentally friendly and effective hydrogen storage applications. Using density functional theory, we find that carbon sheet edges, regardless of whether they are of zigzag or armchair type, can weaken Al–H bonds in sodium alanate, which is believed to be due to a combination of NaAlH4 destabilization and dissociation product stabilization. The helical form of graphene nanofibers, with larger surface area and curved configuration, appears to benefit the functionalization of carbon sheet edges. We believe that our combined experimental and theoretical study will stimulate more explorations of other microporous or mesoporous nanomaterials with an abundance of exposed carbon edges in the application of practical complex light metal hydride systems.

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Section: Resultsmentioning

confidence: 96%

“…However, from the SAED pattern of 2 wt.% HGNF-admixed NaAlH 4 (Figure 1d), it becomes clear that the configuration of GNF is not completely disturbed upon admixing with NaAlH 4 . 15,16 Figure 2 shows the TPD curve of NaAlH 4 admixed with 2 wt. % carbon nanovariants.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Excellent Catalytic Effects of Graphene Nanofibers on Hydrogen Release of Sodium alanate

et al. 2012

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“…During the C 2 H 2 decomposition and H 2 association, Cu NPs mainly adopted regular shape with some special crystal facets to minimize the surface energy [18,22,25]. Since the catalytic activity of each crystal facet is different from each other, the growth rates of CNFs on them are different too [22,23,26]. Therefore, different growth rates of CNFs on the various facets of the distorted decahedron lead to the formation of helical CNFs.…”

Section: The Growth Mechanismmentioning

confidence: 99%

Controllable synthesis of helical, straight, hollow and nitrogen-doped carbon nanofibers and their magnetic properties

2012

Materials Research Bulletin

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“…Moreover, it is known that the catalyst for the growth of CNFs always has regular polyhedron morphology . Those faces correspond to the crystallographic faces of the catalyst crystal.…”

Section: Growth Mechanisms Of Cnfsmentioning

confidence: 99%

CVD growth of carbon nanofibers

Jiang

2014

Phys. Status Solidi A

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This review summarizes the growth and structural properties of carbon nanofibers (CNFs) using microwave plasma‐enhanced chemical vapor deposition (MPCVD) technique and metal particles as the catalysts. The reaction gases were hydrocarbon and H2. Depending on catalyst materials, different types of CNFs have been grown. A four‐step growth mechanism, namely adsorption, desorption, diffusion, and precipitation, is proposed to demonstrate the growth of CNFs under those conditions. The growth of carbon nanohelices (CNHs) is explained by the hexahedron morphology of the catalyst particles and difference in growth velocities on crystallographic surface planes. The appeared and potential applications of CNFs are outlined at the end of this review.

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Growth of helical carbon nanofibers in the presence of Ni−Cu catalysts

Cited by 4 publications

References 22 publications

Excellent Catalytic Effects of Graphene Nanofibers on Hydrogen Release of Sodium alanate

Excellent Catalytic Effects of Graphene Nanofibers on Hydrogen Release of Sodium alanate

Controllable synthesis of helical, straight, hollow and nitrogen-doped carbon nanofibers and their magnetic properties

CVD growth of carbon nanofibers

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