Influence of the pore size in multi-walled carbon nanotubes on the hydrogen storage behaviors

Lee, Sang Soo; Park, Soo‐Jin

doi:10.1016/j.jssc.2012.05.027

Cited by 59 publications

(31 citation statements)

References 45 publications

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“…The physical properties obtained from the N 2 adsorption-desorption data are summarized in Table 1. The adsorption isotherms (Figure 2a) are Type-II isotherms with characteristic H1 hysteresis, which is typical for mesoporous materials (Lee and Park, 2012;Wang et al, 2012). According to the BET analysis (Figure 2b), oxidized MWCNTs had a BET specific surface area of 189.03 m 2 /g with a total pore volume of 0.7625 cm 3 /g and an average pore diameter of 16.134 nm.…”

Section: Resultsmentioning

confidence: 95%

Cr(VI) Adsorption to Magnetic Iron Oxide Nanoparticle‐Multi‐Walled Carbon Nanotube Adsorbents

Lee

Kim

2016

Water Environment Research

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The aim of this study was to investigate the Cr(VI) adsorption to magnetic iron oxide(MIO) nanoparticle- multi-walled carbon nanotubes (MWCNTs) in aqueous solutions using batch experiments. Results show that the maximum adsorption capacity of Cr(VI) to MIO-MWCNTs was 11.256 mg/g. Kinetic model analysis demonstrates that the pseudo-second-order model and Elovich model are suitable for describing the kinetic data. Thermodynamic analysis indicates that Cr(VI) adsorption to MIO-MWCNTs decreased with increasing temperature from 5-60 °C, indicating the spontaneous and exothermic nature of the sorption process. Equilibrium isotherm analysis demonstrates that the Redlich-Peterson model suitably describes the equilibrium data. In the pH experiments, Cr(VI) adsorption to MIO-MWCNTs decreased gradually from 5.70-2.13 mg/g with increasing pH from 3.0-7.3. Sequential extraction indicates that, among the five binding forms of Cr(VI) associated with MIO-MWCNTs, the predominant contributions are the fraction bound to Fe-Mn oxides (57.82%) and the residual (23.38%).

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Section: Resultsmentioning

confidence: 95%

Cr(VI) Adsorption to Magnetic Iron Oxide Nanoparticle‐Multi‐Walled Carbon Nanotube Adsorbents

Lee

Kim

2016

Water Environment Research

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“…Therefore, the hydrogen adsorption capacity of CNTs is proportional to the specific surface area [104]. The molecular-sized pores can absorb a large amount of hydrogen, so pore size and porosity exert a great influence on the hydrogen adsorption capacity of CNTs [105][106][107]. The defects on the surface of CNTs not only serve as the entry point of the hydrogen but also shorten the diffusion path as well as increase the surface area and pore volume of CNTs, thus increasing the hydrogen adsorption capacity.…”

Section: Activation Of Cntsmentioning

confidence: 99%

“…Activation is an effective method to increase the surface area and pore volume of CNTs and introduce defects as well as functional groups, which improve the hydrogen adsorption properties of the surface of CNTs. The commonly used activation methods of CNTs are divided into physical treatment [78,101,[108][109][110][111][112][113][114] and chemical treatment [37,79,105,107,[115][116][117][118].…”

Section: Activation Of Cntsmentioning

confidence: 99%

An Overview of the Recent Progress in Modifications of Carbon Nanotubes for Hydrogen Adsorption

2020

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Many researchers have carried out experimental research and theoretical analysis on hydrogen storage in carbon nanotubes (CNTs), but the results are very inconsistent. The present paper reviewed recent progress in improving the hydrogen storage properties of CNTs by various modifications and analyzed the hydrogen storage mechanism of CNTs. It is certain that the hydrogen storage in CNTs is the result of the combined action of physisorption and chemisorption. However, H2 adsorption on metal-functionalized CNTs still lacks a consistent theory. In the future, the research of CNTs for hydrogen adsorption should be developed in the following three directions: (1) A detailed study of the optimum number of metal atoms without aggregation on CNT should be performed, at the same time suitable preparation methods for realizing controllable doping site and doped configurations should be devised; (2) The material synthesis, purification, and activation methods have to be optimized; (3) Active sites, molecular configurations, effectively accessible surface area, pore size, surface topology, chemical composition of the surface, applied pressure and temperature, defects and dopant, which are some of the important factors that strongly affect the hydrogen adsorption in CNTs, should be better understood.

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“…For comparison, CVD using methane as the carbon source produced multi-walled CNT with a surface area of 82 m 2 /g (Kuo et al, 2008), whereas multi-walled CNT with a surface area of 187 m 2 /g were reported by Gangupomu et al (2016). As-grown multi-walled CNT with a wide range surface area, from 50 to 150 m 2 /g, have also been reported (Lee & Park, 2012).…”

Section: Surface Area and Pore Structure Of The Cntmentioning

confidence: 99%

The Effect of Metal Loading on the Performance of Tri-metallic Supported Catalyst for Carbon Nanotubes Synthesis from Liquefied Petroleum Gas

Setyopratomo

Wulan²,

Sudibandriyo³

2018

IJTech

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Carbon nanotubes (CNT) were synthesized from liquefied petroleum gas by a chemical vapor deposition method using a Fe-Co-Mo/MgO supported catalyst. Metal loading was varied from 2.5 to 20 wt%. The catalyst with metal loading of 10 wt% produced the highest CNT yield, at 4.55 g CNT/g catalyst. This high CNT yield was attributed to the high pore volume of the catalyst. The diameter of the CNT was quite variable: the outer diameter ranged from about 4 to 12 nm, while the inner diameter ranged from about 2 to 5 nm. The catalyst with 10 wt% metal loading produced CNT with the highest surface area and the largest total pore volume. XRD analysis detected the existence of highly oriented pyrolytic graphite, C(002), at 2 theta ≈ 26 o , which was attributed to the CNT.

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Influence of the pore size in multi-walled carbon nanotubes on the hydrogen storage behaviors

Cited by 59 publications

References 45 publications

Cr(VI) Adsorption to Magnetic Iron Oxide Nanoparticle‐Multi‐Walled Carbon Nanotube Adsorbents

Cr(VI) Adsorption to Magnetic Iron Oxide Nanoparticle‐Multi‐Walled Carbon Nanotube Adsorbents

An Overview of the Recent Progress in Modifications of Carbon Nanotubes for Hydrogen Adsorption

The Effect of Metal Loading on the Performance of Tri-metallic Supported Catalyst for Carbon Nanotubes Synthesis from Liquefied Petroleum Gas

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