Highly improved with hydrogen storage capacity and fast kinetics in Mg-based nanocomposites by CNTs

Chen, Bin-Hao; Kuo, C. S.; Ku, Jie-Ren; Yan, Pei-Shan; Huang, Chun-Ju; Jeng, Ming-Shan; Tsau, Fang-Hei

doi:10.1016/j.jallcom.2013.02.062

Cited by 40 publications

(9 citation statements)

References 19 publications

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“…In addition to the dispersion of CNTs in Zr powders, another question need to concern is the effect of adding CNTs on the morphology evolution of Zr powders. From Fig.4 and Fig.5, we could see that compared with pure Zr milled for the same time, particle size of Zr in Zr/CNTs mixtures looks larger, especially when milling time is shorter than 3 h. This result is different from the morphology evolution of Al/CNTs [18] and Mg/CNTs [19] , where CNTs as a grinding aid favor the particle size reduction. Probable reasons for this difference are as follows: in case of Al/CNTs and Mg/CNTs, the promoting role of CNTs in particle size reduction occurs under the conditions that CNTs are heterogeneously dispersed and coat the surface of these metal particles, so the agglomeration and cold-welding of metal particles are prevented.…”

Section: Structure and Morphology Analysismentioning

confidence: 84%

“…Despite those CNTs existing in the gaps of fine Zr particles, some of the shortened CNTs begin to adhere to the surface of coarse Zr particles, and some of the CNTs integrate with nano-scale Zr particles, leading to the increase in their diameter. Compared with the dispersion of CNTs in other metal powders such as Al [18] and Mg [19] through mechanical milling processing, the characteristic of CNTs dispersion in Zr powder is that it is difficult to let CNTs insert or embed into the Zr matrix. This is probably because the ductibility of Zr is worse than that of the soft metal like Al and Mg.…”

Section: Methodsmentioning

confidence: 99%

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Effect of CNTs-Assisted Ball Milling on Morphology and Oxidation Behavior of Zr Powders

Kang

Zhu

Yang

et al. 2017

Rare Metal Materials and Engineering

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Morphology evolution and oxidation behavior of Zr powders milled with and without CNTs for different time were compared. XRD and SEM were used to determine the phase composition and morphology of obtained Zr and Zr/CNTs powders. Thermogravity (TG) analysis was applied to evaluate the thermal oxidation behavior of Zr and Zr/CNTs. Results show that the phase composition of Zr after milling is not influenced by adding CNTs, but the morphology and oxidation behavior of Zr are influenced. In case of milling without CNTs, particle size of Zr continues to reduce from more than 10 μm to about 2~3 μm when milling time increases from 1 h to 3 h. In case of CNTs-assisted milling, the particle size reduction of Zr is not obvious until milling time is prolonged to 3 h. This is because those CNTs adhered on the surface of Zr or CNTs-induced agglomerations among Zr prohibit the mechanical impact and fracturing effects of milling balls on Zr particles. Compared with direct milling of Zr, when the obtained Zr has similar particle size, adding CNTs lowers the onset oxidation temperature and peak exothermic temperature of Zr powders by 11~37 °C , depending on milling time. This is ascribed to the high heat conductivity of CNTs which favors heat transfer between Zr particles. At the same time, oxidative mass gain of Zr/CNTs is slightly lower than that of the corresponding pure Zr when milling time is less than 2 h and then this trend reverses. The initial decrease in mass gain of Zr in Zr/CNTs mixtures under shorter milling time is related to two factors: one is CNTs-induced agglomerations of Zr, which prohibits the contact of Zr with oxygen and thus decreases the degree of oxidation, and the other is the delayed particle size reduction of Zr in Zr/CNTs mixtures. The subsequent reversal in mass gain for pure Zr and Zr/CNTs is due to the positive effect of particle size reduction of Zr in Zr/CNTs on its thermal oxidation just began, while the spontaneous oxidation-induced negative effect for well-refined pure Zr has become very obvious.

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Section: Structure and Morphology Analysismentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Effect of CNTs-Assisted Ball Milling on Morphology and Oxidation Behavior of Zr Powders

Kang

Zhu

Yang

et al. 2017

Rare Metal Materials and Engineering

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“…It was demonstrated that only a few wt.% of CNT results in greatly enhanced kinetics of sorption reactions in Mg-Ni alloys [86,87]. CNT catalyzed Mg was able to absorb approximately 1.5 times more hydrogen than its uncatalyzed counterpart during the first couple of minutes of hydrogenation [88]. Based on these works, it is believed that the role of the carbon nanotubes in absorption/desorption reactions is to provide fast diffusion channels for the hydrogen atoms through a surface passivation layer into the bulk material [86,89].…”

Section: Nanocrystalline Mg Catalyzed By Nanotube Additivesmentioning

confidence: 99%

High-Pressure Torsion of Non-Equilibrium Hydrogen Storage Materials: A Review

Révész

Gajdics

2021

Energies

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As the most abundant element in the world, hydrogen is a promising energy carrier and has received continuously growing attention in the last couple of decades. At the very moment, hydrogen fuel is imagined as the part of a sustainable and eco-friendly energy system, the “hydrogen grand challenge”. Among the large number of storage solutions, solid-state hydrogen storage is considered to be the safest and most efficient route for on-board applications via fuel cell devices. Notwithstanding the various advantages, storing hydrogen in a lightweight and compact form still presents a barrier towards the wide-spread commercialization of hydrogen technology. In this review paper we summarize the latest findings on solid-state storage solutions of different non-equilibrium systems which have been synthesized by mechanical routes based on severe plastic deformation. Among these deformation techniques, high-pressure torsion is proved to be a proficient method due to the extremely high applied shear strain that develops in bulk nanocrystalline and amorphous materials.

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“…The Mg-CNTs composite was manufactured by a simple ball milling process described previously. 30,31 Briey, a mixture containing magnesium metal powder (1.0 g), CNTs (0.2 g) and PVDF (0.48 g) was ball milled in planetary ball miller (QM-3SP4, Nanjing university instrument factory, Nanjing, China) under argon atmosphere with zirconia beads (f 6 mm). The weight ratio of ball to powder was set to 100 : 1 and the rotational speed was controlled at 400 rpm.…”

Section: Preparation Of Mg-cnts Compositementioning

confidence: 99%

Efficient in situ generation of H₂O₂ by novel magnesium–carbon nanotube composites

et al. 2018

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Highly improved with hydrogen storage capacity and fast kinetics in Mg-based nanocomposites by CNTs

Cited by 40 publications

References 19 publications

Effect of CNTs-Assisted Ball Milling on Morphology and Oxidation Behavior of Zr Powders

Effect of CNTs-Assisted Ball Milling on Morphology and Oxidation Behavior of Zr Powders

High-Pressure Torsion of Non-Equilibrium Hydrogen Storage Materials: A Review

Efficient in situ generation of H₂O₂ by novel magnesium–carbon nanotube composites

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Highly improved with hydrogen storage capacity and fast kinetics in Mg-based nanocomposites by CNTs

Cited by 40 publications

References 19 publications

Effect of CNTs-Assisted Ball Milling on Morphology and Oxidation Behavior of Zr Powders

Effect of CNTs-Assisted Ball Milling on Morphology and Oxidation Behavior of Zr Powders

High-Pressure Torsion of Non-Equilibrium Hydrogen Storage Materials: A Review

Efficient in situ generation of H2O2 by novel magnesium–carbon nanotube composites

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Efficient in situ generation of H₂O₂ by novel magnesium–carbon nanotube composites