At present, ball milling has been widely used to synthesize MgH 2 with improved hydrogen storage properties. Ball milling under a hydrogen atmosphere has …
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Effect of ball-milling duration and dehydrogenation on the morphology, microstructure and catalyst dispersion in Ni-catalyzed MgH 2 hydrogen storage materials. / House, Stephen D.; Vajo, John J.; Ren, Chai et al. In: Acta Materialia, Vol. 86, 03.2015, p. 55-68. Research output: Contribution to journal › Article › peer-review
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But when the time is for 3 h, the hydrogen absorption kinetic mechanism of the alloy is different from other ball milling time. The hydrogen absorption M value of the alloy is 1.201 and 0.806 for 180 min, while the M mean of other ball milling time is around 0.54, indicating that the hydrogen absorption mechanism of the alloy for 180 min is ...
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For example, the activated nanocomposite produced by ball milling with addition of wet-milled TiFe reached the hydrogen storage capacity of 3.94 wt %, after absorption for 15 h at RT. It is clear that the refinement of TiFe and its homogeneous distribution in the matrix of Mg were essential for improving properties of hydrogen …
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storage properties of La-Ce-Mg-Ni alloy by ball milling and found that ball milling would change the particle size of the alloy and increase the surface activity. Song et al. [29] also improved the hydrogen storage properties of Ce-Mg-Ni alloy by ball milling and found that the polycrystalline bound-
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Abstract: A high-energy ball-milling method was applied for different milling times (1 h, 3 h, and 10 h) to synthetize nanocrystalline MgH 2 powder samples catalyzed by Fe 2 Ti. Morphology and mi-
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Through the calculation of materials based on atomic scale (computer design of materials), selecting the appropriate alloy composition and ball milling parameters (ball milling time, ball-to-powder weight ratio, Ball mill speed, etc.) will be an effective way to realize large-scale practical use of magnesium-based hydrogen storage materials; (2 ...
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It is concluded that ball milling can significantly improve the kinetic and electrochemical properties of magnesium-based hydrogen storage materials and increase the hydrogen storage...
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The effect of high energy milling and cold rolling on the BCC solid solution TiV 1.6 Mn 0.4 was investigated. The as-cast alloy presented a nanocrystalline structure with a crystallite size of 17. nm.. After 5 h of milling a slight reduction of crystallite size was measured and the BCC solid solution lattice parameter was reduced from 3.082 Å to …
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Ball milling the powders of Mg-based alloys with transition metal compounds is effective for improving their hydrogen storage performances. In this experiment, the alloys of La 1.7 Y 0.3 Mg 16 Ni + x wt.% TiF 3 (x = 0–10) were prepared through mechanical milling technology. XRD, SEM, HRTEM and granulometry were used to …
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Although ball milling is a convenient method and can improve the hydrogen storage performance of MgH 2 to a certain extent via formation of small grain size, crystal defects, and unstable γ-MgH 2 phase, particle sizes around 300 nm seem to be the down limit that ball milling can reach because agglomeration and cold-welding process are …
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The ball-milling jars were configured to rotate at 1100 rpm, while the sun speed, at which the jars are connected and balanced, was adjusted to 220 rpm. The hydrogen storage properties of HGPS were analyzed using Sievert's type apparatus using a Pressure Composition Isotherm instrument (PCI, Suzuki Shokan Co., Ltd.) [34].
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Magnesium hydride was prepared by reaction ball milling, i.e. mechanically milling magnesium (purity >99.9%, 300 mesh) under hydrogen atmosphere with an initial pressure of ∼1 MPa, followed by a long-period hydrogenation at 300 °C. The process was repeated for three times to achieve a hydrogenation ratio of ∼80%, which was …
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This study focuses on the preparation of a Mg 2 Ni hydrogen storage alloy through high-energy ball milling, further enhanced by composite graphene and multi …
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Ball milling technique was used for deposition of the polytetrafluoroethylene (PTFE) coating on the powder of TiFe intermetallic compound. Measurement of pressure–composition hydrogen absorption isotherms revealed that the polymer-coated TiFe intermetallic compound kept its hydrogen storage ability.
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Hydrogen storage technology is the major pillar for the fast growing hydrogen based energy infrastructure apart from production and delivery. Numerous attempts have been made by researchers for rational design of safe hydrogen storage technology. ... The short-time ball milling can increase the activation property, shorten …
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Hydrogen storage in Mg/MgH 2 materials is still an active research topic. In this work, a mixture of Mg-15wt.% VCl 3 was produced by cryogenic ball milling and tested for hydrogen storage. Short milling time (1 h), liquid N 2 cooling, and the use of VCl 3 as an additive produced micro-flaked particles approximately 2.5–5.0 µm thick. The Mg …
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The researchers described the method as having a "remarkably high gas storage capability." This, they say, is due to the novel way gas molecules stick to the powder during the ball milling process, which does not break the gas molecules. The ball-milling gas absorption process consumes 76.8 KJ/s to store and separate 1000L of gases.
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Researchers at Deakin's Institute for Frontier Materials have discovered a new method, "ball milling," to store gas in a special nanomaterial at room temperature.
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The present paper reviews recent progress in improving the hydrogen storage properties by element substitution and additives. Ball milling is the promising technology for preparing magnesium-based hydrogen …
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Metal borides have attracted the attention of researchers due to their useful physical properties and unique ability to form high hydrogen-capacity metal borohydrides. We demonstrate improved hydrogen storage properties of a nanoscale Mg–B material made by surfactant ball milling MgB2 in a mixture of heptane, oleic acid, and oleylamine. …
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1. Introduction. Hydrogen is an energy carrier that is both clean and effective. It is possible to manufacture it using primary energy sources such as fossil fuels, nuclear power, renewable resources, and others (BOULET and GEWARD, 1983, IP, 2009, JAIN et al., 2009, SCHLAPBACH et al., 1979).With the development of materials science, high …
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This study focuses on the preparation of a Mg 2 Ni hydrogen storage alloy through high-energy ball milling, further enhanced by composite graphene and multi-walled carbon nanotubes (MWCNTs) modification.It is evident that high-energy ball milling successfully incorporates graphene and MWCNTs onto the surface of Mg 2 Ni particles. …
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As shown in the later session, the SSA and micropore volume will decrease with the introduction of excessive defects by long time ball milling, which also lower the hydrogen storage capacity. The decrease of hydrogen storage capacity of the sample ball-milled for 18 h may be ascribed to these reasons. Download : Download full-size …
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In this paper, Mg 2 Ni hydrogen storage alloy powder was prepared by high-energy ball milling mechanical alloying method, and the influence of stirring shaft rotation speed, ball milling time, and different sizes of ball mills on the formation time, powder morphology, and crystal structure of Mg 2 Ni alloy during ball milling was studied. The …
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The alloy with 10 h of ball milling has the best overall hydrogen storage performance. Under the conditions of 553 K and 3.5 MPa, the 4.499 wt % H 2 can be …
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In the present work, the effect of ball milling in the hydrogen storage performance of PMMA/h-BN core–shell nanocomposite (BPBNC) was investigated. The incorporation of h-BN into BPMMA matrix alters the amorphous to polycrystalline (BPBNC) which in turn enhances the crystalline size (22.3 nm), ...
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VCl 3 was produced by cryogenic ball milling and tested for hydrogen storage. Short milling time (1 h), liquid N 2 cooling, and the use of VCl 3 as an additive …
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This study focuses on the preparation of a Mg 2 Ni hydrogen storage alloy through high-energy ball milling, further enhanced by composite graphene and multi-walled carbon nanotubes (MWCNTs) modification. It is evident that high-energy ball milling successfully incorporates graphene and MWCNTs onto the surface of Mg 2 Ni particles. …
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Section snippets Preparation of Mg-based hydrogen storage materials. The Mg used has a purity of >99.9 wt% and a particle size of <74 μm (Tianjin Ruijinte Chemical Company, China) and CeO 2 has a purity of 99.9 wt% and a particle size of <100 nm (Tianjin Guangfu Fine Chemical Research Institute, China). The hydrogen used has …
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