Hydrogen storage in carbon nanotubes modified by microwave plasma etching and Pd decoration

Mu, Shichun; Tang, Haolin; Qian, Sheng-hao; Pan, Mu; Run-zhang, Yuan

doi:10.1016/j.carbon.2005.09.010

Cited by 128 publications

(69 citation statements)

References 11 publications

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“…At 298 K and high-pressure (Figure 7b), both adsorption and desorption PCI isotherms exhibit linear behavior with low hydrogen uptake (≤0.26 wt%). Such a low capacity is attributed to the low enthalpy of hydrogen adsorption [31] and concurs with earlier reports on platinum doping in super activated carbon [18] and palladium in mesoporous carbon [32]. Similar capacities have been reported for hydrogen storage in activated carbon of even higher surface area As = 3,500 g/cm 3 [23].…”

Section: Hydrogen Storage Measurementssupporting

confidence: 90%

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Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

et al. 2015

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Activated carbon has been synthesized from local palm shell, cardboard and plastics municipal waste in the Kingdom of Saudi Arabia. It exhibits a surface area of 930 m 2 /g and total pore volume of 0.42 cm 3 /g. This pristine activated carbon has been further anchored with nickel, palladium and platinum metal particles by ultrasound-assisted impregnation. Deposition of nanosized Pt particles as small as 3 nm has been achieved, while for Ni and Pd their size reaches 100 nm. The solid-gas hydrogenation properties of the pristine and metal-anchored activated carbon have been determined. The pristine material exhibits a reversible hydrogen storage capacity of 2.3 wt% at 77 K and 3 MPa which is higher than for the doped ones. In these materials, the spillover effect due to metal doping is of minor importance in enhancing the hydrogen uptake compared with the counter-effect of the additional mass of the metal particles and pore blocking on the carbon surface. OPEN ACCESS

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Section: Hydrogen Storage Measurementssupporting

confidence: 90%

“…For Pd doping, Lueking et al reported that the optimum loading for hydrogen storage on activated carbon is 14 wt%, while it is 5.7 wt% in single wall carbon nanotubes [17]. Mu et al used 20 wt% of palladium for enhancing the hydrogen storage capacity in etched carbon nanotubes [18].…”

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confidence: 99%

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

et al. 2015

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“…There must be a strong interaction between the hydrogen and carbon surfaces to give rise to high storage capacity [20] . Zacharia et al [12] proved that metal particles could enhance the storage capacity of the CNTs via the spill-over mechanism.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen storage of multiwalled carbon nanotubes coated with Pd-Ni nanoparticles under moderate conditions

2006

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A type of novel material with a high hydrogen storage capacity was prepared by supporting PdNi 18 alloy nanoparticles, which were synthesized by using a new colloid method, on the surface of pretreated multiwalled carbon nanotubes (MWCNTs). The average PdNi 18 alloy particle sizes calculated from XRD patterns were ca. 3 nm, and the high dispersion of these particles on MWCNTs was confirmed by TEM image. Hydrogen storage performance of the composite was investigated under moderate pressure (0.1-1.5 MPa) at room temperature, and a maximum storage capacity of ca. 2.3 wt% was achieved under 1.5 MPa at room temperature, which was much higher than that reported previously under the same conditions.Hydrogen is one of the most promising future fuel for transportation, but the hydrogen storage is still a big challenge [1] . In recent five years more than 200 papers on carbon nanotubes (CNTs) related to hydrogen storage have been published, for instance [2][3][4][5][6] . However, the hydrogen storage capacity of most reported materials was generally at or below 1 wt% at ambient temperature and moderate pressure [7,8] . It was reported widely that the pretreated-CNTs showed good hydrogen storage properties, and some transition metals, such as palladium and nickel, were excellent hydrogen uptake materials [9][10][11] . Thus it was believable that a composite of CNTs-supported metal nanoparticles would have an excellent hydrogen storage performance.In several latest papers, metal-assisted hydrogen storage by multiwalled carbon nanotubes (MWCNTs) was reported to be feasible. It was testified that atomic hydrogen could be stored at defect sites on MWCNTs promoted by transition metal particles [12][13][14][15] . Zacharia et al. [12] found that the storage capacity of acid-treatment MWCNTs dispersed with Pd (2.5 wt%) was found to be 0.66 wt% at room temperature and 2 MPa, which increased nearly by 30% in hydrogen storage capacity compared with the pristine MWCNTs. And the defect density on the wall of MWCNTs was expected to be much greater than that of single-walled carbon nanotubes (SWCNTs) and the hydrogen storage capacity varied depending on the number of defects due to their dangling bonds [11] .In this work, PdNi 18 /MWCNTs composites with a high hydrogen storage capacity were prepared by supporting PdNi 18 alloy nanoparticles, which were synthesized by a colloid method, on the surface of pretreated-MWCNTs. The particle size of Pd-Ni alloy could be 3-5 nm at room temperature and lower than 1.5 MPa pressure, and the storage amount of hydrogen could be 2.3 wt%. In the following discussion, if not emphasized, CNTs were denoted to MWCNTs. Materials and methodsThe CNTs used in this work were supplied by Tsinghua University [16] . The nanotubes were pretreated by the following procedures: firstly, the sample was stirred in acetone and ethyl acetate at room temperature for 12 h, followed by filtering, washing with de-ionized water, and drying at 373 K; secondly, the sample was boiled in sodium hydroxide solution (1 mol/L) for 12 h,...

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“…Normally, the D peak originates from lattice distortion in sp 2 -hybridized carbon and becomes active in the presence of various defects (e.g., vacancy, topological defects, impurities). The G peak corresponds to the graphitic carbon with a sp 2 electronic configuration [25,26]. The ratio of I D /I G (the intensity of the G peak divided by the intensity of the D peak) is commonly used to estimate the structural defects in the doped carbon catalyst [27].…”

Section: Physicochemical Characterizationmentioning

confidence: 99%

Improved oxygen reduction activity of porous carbon materials by self-doping nitrogen derived from PVP with urea as a promoter

Zhang

Amiinu

et al. 2015

Electrochimica Acta

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Hydrogen storage in carbon nanotubes modified by microwave plasma etching and Pd decoration

Cited by 128 publications

References 11 publications

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

Hydrogen storage of multiwalled carbon nanotubes coated with Pd-Ni nanoparticles under moderate conditions

Improved oxygen reduction activity of porous carbon materials by self-doping nitrogen derived from PVP with urea as a promoter

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