Hydrogen adsorption of carbon nanotubes grown on different catalysts

Dündar-Tekkaya, Ezgi; Karatepe, Nilgün

doi:10.1016/j.ijhydene.2014.10.145

Cited by 18 publications

(10 citation statements)

References 23 publications

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“…8 While the use of a metal or chemical hydride as a storage medium could mitigate the need for low temperature or high pressure storage vessels, these materials tend to suffer from either capacity limitations or problems arising from large activation energies and reversibility issues. [12][13][14][15] An alternative to either cryogenic or compressive storage involves the use of an adsorbent material such as a zeolite 16 or activated carbon 17 to boost the hydrogen density in a tank under more ambient conditions. With just two electrons and a low polarizability, H 2 is capable of engaging in only weak van der Waals interactions, leading to an adsorption enthalpy that is typically on the order of −5 kJ/mol.…”

Section: Introductionmentioning

confidence: 99%

Record High Hydrogen Storage Capacity in the Metal–Organic Framework Ni₂(m-dobdc) at Near-Ambient Temperatures

et al. 2018

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Hydrogen holds promise as a clean alternative automobile fuel, but its on-board storage presents significant challenges due to the low temperatures and/or high pressures required to achieve a sufficient energy density. The opportunity to significantly reduce the required pressure for high density H 2 storage persists for metal-organic frameworks due to their modular structures and large internal surface areas. The measurement of H 2 adsorption in such materials under conditions most relevant to on-board storage is crucial to understanding how these materials would perform in actual applications, although such data have to date been lacking. In the present work, the metalorganic frameworks M 2 (m-dobdc) (M = Co, Ni; m-dobdc 4− = 4,6-dioxido-1,3benzenedicarboxylate) and the isomeric frameworks M 2 (dobdc) (M = Co, Ni; dobdc 4− = 1,4dioxido-1,3-benzenedicarboxylate), which are known to have open metal cation sites that strongly interact with H 2 , were evaluated for their usable volumetric H 2 storage capacities over a range of near-ambient temperatures relevant to on-board storage. Based upon adsorption isotherm data, Ni 2 (m-dobdc) was found to be the top-performing physisorptive storage material with a usable volumetric capacity between 100 and 5 bar of 11.0 g/L at 25 °C and 23.0 g/L with a temperature swing between −75 and 25 °C. Additional neutron diffraction and infrared spectroscopy experiments performed with in situ dosing of D 2 or H 2 were used to probe the hydrogen storage properties of these materials under the relevant conditions. The results provide benchmark characteristics for comparison with future attempts to achieve improved adsorbents for mobile hydrogen storage applications.

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Section: Introductionmentioning

confidence: 99%

Record High Hydrogen Storage Capacity in the Metal–Organic Framework Ni₂(m-dobdc) at Near-Ambient Temperatures

et al. 2018

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“…For instance, each one of the single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) has been prepared with various diameters, internal and external specific surface area, porosity and other additional properties such that they have a different hydrogen storage (Table 2) (Figure 3). Dündar et al prepared SWCNTs by chemical vapour deposition of C 2 H 2 at 800 °C for 60 min using different catalysts (V, Ni, Co, Fe, Fe-Co) on MgO with different rates (Table 2) 31 . The results illustrate that hydrogen adsorption on SWCNTs started from 2.76 wt% to 5.25 wt%.…”

Section: Carbon Nanotubes (Cnts)mentioning

confidence: 99%

A Review on Modified Carbon Materials as Promising Agents for Hydrogen Storage

2018

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Carbon materials have been regarded as promising agents for hydrogen storage because of properties such as their light weight, acceptable affinity of carbon for hydrogen and high specific surface area. We can identify many different carbon materials which have been studied extensively such as activated carbons (AC) graphene sheets (GS), carbon nanotubes (CNTs) and other derivative carbon materials derived from theoretical and experimental methods such as g-C3N4, graphyne and carbon nanolayer. These materials can be modified by additional ingredients like free metals, metal oxides, and alloys to improve their hydrogen storage capacity. In this short review article, we attempt to introduce new, reliable, complete and categorised data for researchers concentrating on articles from the last five years (2013-2017) relating to hydrogen storage.

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“…Notably, carbon nanotubes were initially considered to be the solution to hydrogen storage problem but now seems clear that this is not the case [12,13]. Besides a setback on the relevant research, carbon nanotubes and their functionalized counterparts are now attracting a recursive interest as hydrogen sorbents [14][15][16][17][18][19][20][21]. This is primarily because the nanotubes are used as structured supports in advanced nanocomposites or can be embedded in membrane bilayers and mixed matrices [22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Pulling Simulations and Hydrogen Sorption Modelling on Carbon Nanotube Bundles

Gotzias

Sapalidis

2020

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Recent progress in molecular simulation technology has developed an interest in modernizing the usual computational methods and approaches. For instance, most of the theoretical work on hydrogen adsorption on carbon nanotubes was conducted a decade ago. It should be insightful to reinvestigate the field and take advantage of code improvements and features implemented in contemporary software. One example of such features is the pulling simulation modules now available in many molecular dynamics programs. We conduct pulling simulations on pairs of carbon nanotubes and measure the inter-tube distance before they dissociate in water. We use this distance to set the interval size between adjacent nanotubes as we arrange them in bundle configurations. We consider bundles with triangular, intermediate and honeycomb patterns, and armchair nanotubes with a chiral index from n = 5 to n = 10. Then, we simulate low pressure hydrogen adsorption isotherms at 77 K, using the grand canonical Monte Carlo method. The different bundle configurations adsorb great hydrogen amounts that may exceed 2% wt at ambient pressures. The computed hydrogen capacities are considered large for physisorption on carbon nanostructures and attributed to the ultra-microporous network and extraordinary high surface area of the configured models.

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Hydrogen adsorption of carbon nanotubes grown on different catalysts

Cited by 18 publications

References 23 publications

Record High Hydrogen Storage Capacity in the Metal–Organic Framework Ni₂(m-dobdc) at Near-Ambient Temperatures

Record High Hydrogen Storage Capacity in the Metal–Organic Framework Ni₂(m-dobdc) at Near-Ambient Temperatures

A Review on Modified Carbon Materials as Promising Agents for Hydrogen Storage

Pulling Simulations and Hydrogen Sorption Modelling on Carbon Nanotube Bundles

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Hydrogen adsorption of carbon nanotubes grown on different catalysts

Cited by 18 publications

References 23 publications

Record High Hydrogen Storage Capacity in the Metal–Organic Framework Ni2(m-dobdc) at Near-Ambient Temperatures

Record High Hydrogen Storage Capacity in the Metal–Organic Framework Ni2(m-dobdc) at Near-Ambient Temperatures

A Review on Modified Carbon Materials as Promising Agents for Hydrogen Storage

Pulling Simulations and Hydrogen Sorption Modelling on Carbon Nanotube Bundles

Contact Info

Product

Resources

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Record High Hydrogen Storage Capacity in the Metal–Organic Framework Ni₂(m-dobdc) at Near-Ambient Temperatures

Record High Hydrogen Storage Capacity in the Metal–Organic Framework Ni₂(m-dobdc) at Near-Ambient Temperatures