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Aiming at improving hydrogen storage performance of Mg-base alloy, the Mg 90 Ce 3 Ni 7 alloy is prepared by medium-frequency induction melting and following mechanical ball-milling process. X-ray diffraction analysis reveals that the ball-milling Mg 90 Ce 3 Ni 7 alloy is composed of Mg, Mg 2 Ni and CeMg 12 phases, whereas …
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The combined presence of both elements may promote the formation of multiple hydride phases or alloy structures, improving the overall hydrogen storage capacity. The ball milling process likely facilitates the dispersion and alloying of Ni and Co within the AZ61 matrix, leading to improved hydrogen absorption properties.
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"The ball-milling gas adsorption process is estimated to consume 76.8 KJ/s to separate 1,000 liters (220 gal) of olefin/paraffin mixture, which is two orders less than that of the cryogenic ...
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The time for the reaction of high ball-milling is much shorter when contrasted with the direct synthesis of NaAlH 4 in the organic solvent. Also, the response temperature is low and material which is to be prepared have progressively reactive properties during hydrogen uptake and discharge reactions [26], [27], [28].Sodium alanate (NaAlH 4) is a …
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The hydrogen storage capacities of these solid solutions were investigated for different milling times and at different temperatures. 2. Experimental details. Ball milling was carried out, nominally at room temperature using planetary (Restch P100 type) ball mill. The vial and ball materials were hardened chromium steel.
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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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However, part of the hydrogen storage capacity was lost in modified material (AlH 3 –0%LaNi 5, AlH 3 –5%LaNi 5, AlH 3 –10%LaNi 5, AlH 3 –15% LaNi 5) during the ball milling process due to the effect of ball milling, although good dehydrogenation performance is obtained. Among them, the onset dehydrogenation …
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The development of magnesium alloys through ball milling has the potential to significantly contribute to the development of solid-state hydrogen storage …
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Mg/CeO 2 composites for hydrogen storage were prepared by ball milling. • CeO 2 additive can reduce Mg crystal domains to nanoscale during ball milling. • Dehydriding activation energy and temperature of MgH 2 are reduced by CeO 2 addition. • Oxygen vacancy defects on the composites can improve hydrogen storage performance.
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The hydrogen storage performance of the MgH 2 /SWNT composite prepared under an optimal condition, i.e. 5 wt.% SWNTs and milling for 10 h, was further investigated. As shown in Fig. 6, the composite could desorb about 6.1 wt.% hydrogen within 5 min at 623 K, and pure MgH 2 could only desorb 4.1 wt.% hydrogen within 60 …
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In this study, La15Fe2Ni72Mn7B2Al2 hydrogen storage was composited with grapheme and the effect of ball milling time on the microstructure and properties of the alloy were studied. XRD analysis shows that the as-milled composites alloy consists of LaNi5, La3Ni13B2 and (Fe, Ni) phases. No new phase is formed in the composites alloy …
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It can see that the maximum hydrogen storage capacity after alloy ball milling is significantly reduced, and the lag of hydrogen absorption is gradually reduced. …
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The present work is aimed to prepare a lightweight, compact, novel hydrogen storage medium and efficient electrode material using polymethyl methacrylate (PMMA) …
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Li–Mg–N–B–H/ZrCoH3 composites were successfully synthesized by ball milling of the reactants under argon and hydrogen atmosphere, respectively. The composite synthesized by reactive ball milling (RBM) under hydrogen has the best hydrogen storage properties. It can desorb 3.71 wt% hydrogen in 60 min at 150 °C …
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Developing safer and more efficient hydrogen storage technology is a pivotal step to realizing the hydrogen economy. Owing to the lightweight, high hydrogen storage density and abundant reserves, MgH2 has been widely studied as one of the most promising solid-state hydrogen storage materials. However, defects such as stable …
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Hydrogen storage by means of metal hydride can meet the security requirement of hydrogen application [3]. ... which was better than that of the as-milled TiFe alloy reported by Jankowska et al. [39]. This is because that the ball milling effect relies on many factors [40]: (1) raw materials, including: purity, particle size, oxygen content and ...
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Abstract. 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 …
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Hydrogen storage materials discovery via high throughput ball milling and gas sorption. 2012 Jun 11;14 (6):352-8. doi: 10.1021/co2001789. Epub 2012 May 22. The lack of a high capacity hydrogen storage material is a major barrier to the implementation of the hydrogen economy. To accelerate discovery of such materials, we have …
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Next, upon addition of Mg powder, the ball milling of graphite with benzene yielded nanocomposites, resulting in drastic changes in behavior of hydrogen uptake (Fig. 2).The quantities of hydrogen taken up increased and its desorption temperature significantly decreased compared to the results without Mg; the desorption of hydrogen …
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Using Ball Milling for Modification of the Hydrogenation/Dehydrogenation Process in Magnesium-Based Hydrogen Storage Materials: An Overview. by Jinzhe Lyu. Jinzhe …
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The binary TiFe alloy was synthesized by mechanical alloying (MA) under argon atmosphere at room temperature. The effect of ball to powder weight ratio on the microstructures was characterized by X-ray diffraction (XRD). The effect of milling time on the electrochemical and activation properties was investigated by scanning electron …
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Although, the results shown in Fig. 1 show that the hydrogen storage capacity decrease with increase in ball-milling time, an independent kinetic measurements with a high starting pressure (around 100 bar) showed that the 100 h milled sample absorbs hydrogen up to the expected maximum capacity. Fig. 2 shows the absorption kinetics of …
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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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Jalil et al. introduced nano-nickel into MgH 2 through ball milling under a high hydrogen pressure of 10 MPa to improve the absorption ... we can conclude that the significantly enhanced behavior for hydrogen storage of the BM-MgH 2-Ni/MnO-10 composite could be attributed to the synergistic catalytic effect of the reversible ...
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Improved hydrogen storage properties of MgH2 by ball milling with AlH3: preparations, de/rehydriding properties, and reaction mechanisms - Journal of Materials Chemistry A …
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Ball milling is the most common technique to synthesize the hydrogen storage materials, which consists of mechanical grinding, mechanical alloying and reactive ball milling. The ball-milled materials with superior nano-size were formed when the strong force generated in the process of ball milling was applied to the composites inside.
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The ball-milling gas absorption process consumes 76.8 KJ/s to store and separate 1000L of gases. This at least 90% less than the energy used in the petroleum …
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In this paper, Mg2Ni hydrogen storage alloy powder was prepared by high-energy ball milling mechanical alloying method, and the influence of stirring shaft rotation speed, ball milling...
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After 2 h of ball milling, the hydrogen desorption temperature was lowered, but the hydrogen storage capacity decreased from 7.3 wt.% to 6.1 wt.%. This behavior probably results from the increased grain-boundary regions, since the bulk Mg can absorb more hydrogen than the Mg located at the grain boundary.
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For example, Mg 2 Ni can be protected by hydrogen from ball milling, during which hydrogen reacts with Mg 2 Ni alloy, denoting the hydrogen reserves of 1.6 wt%. The ball-milled sample has a good hydrogen absorption performance, with a hydrogen absorption temperature of 140 °C, and a reduced hydrogen release …
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As for an important value to characterize the hydrogen storage kinetic, hydrogen desorption activation (E a), we utilized Johnson–Mehl–Avrami (JMA) model to simulate the curves and Arrhenius method to calculate it. Then, the influence of Ni content and ball milling time on the hydrogen storage kinetics can be obtained from it.
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After 5 h milling results show maximum hydrogen storage 5.32 wt% for Mg-2wt% FeTi while 5.21 wt% for Mg-5wt% FeTi solid solutions and also found that the hydrogen absorption pressure of the ball-milled sample is lower than that of the as-prepared (0 h milling) sample.
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The La 7 Ce 3 Mg 80 Ni 10 alloy was successfully prepared and then treated by ball milling. • Prolonging milling time does not lead to continuous improvement in hydrogen storage properties of the alloy. • The La 7 Ce 3 Mg 80 Ni 10 sample milled for 10 h shows the optimal hydrogen storage performance.
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Ball milling is a mechanical technique that is broadly used to grind powders into fine particles [134–141]. The reactants are generally broken apart using solvent molecules in the traditional method; but in ball milling, reactants are broken by using mechanical forces. The term mechanochemistry has been introduced very recently [142].
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Particularly, ball-milling has been proven to be a facile method to prepare Mg-based composites in hydrogen storage fields. It has been found that the MgH 2 and …
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The ball-milling treatment produced amorphous structure and refined the particle size of the alloy. Electrochemical studies revealed that the discharge capacity of …
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