Size effects and hydrogen storage properties of Mg nanoparticles synthesised by an electroless reduction method

Liu, Wei; Aguey‐Zinsou, Kondo‐François

doi:10.1039/c4ta01108b

Cited by 102 publications

(95 citation statements)

References 39 publications

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“…Hydrogen release occurred at relatively high temperatures (>300 °C), but such a behavior similar to that of bulk Mg should be expected. The Mg particles resulting from the reduction of dibutylmagnesium with calcium are relatively large and a decrease in hydrogen desorption temperatures was observed for much smaller magnesium particles (<25 nm), only . The smaller hydrogen capacity recorded by TGA was assigned to remaining calcium within the material and the difficulty of separating highly dispersed calcium nanoparticles from the magnesium rods through repetitive washing and centrifuging.…”

Section: Resultsmentioning

confidence: 99%

“…This lower value of Δ H was also accompanied by a drop in entropy (Δ S ) from 139.0 ± 3.0 to 123.3 ± 9.3 J K −1 mol −1 H 2 leading to a compensation effect in the decrease of Δ H . Such a compensation effect previously reported as particle size decreases is thus limiting any potential decrease in hydrogen desorption temperature through the formation of Mg nanofibers . The enthalpy of desorption was also determined but was found to be much higher than that of ball milled Mg (Table ).…”

Section: Resultsmentioning

confidence: 99%

“…The reaction was carried out by reducing MgCp 2 in tetrahydrofuran (THF) using lithium naphthalenide and the resulting magnesium nanoparticles were able to cycle hydrogen at 200 °C. Instead of MgCp 2 , MgBu 2 was used as precursor in the work of Liu et al Lithium was used as reducing agent and catalytic quantity of naphthalene was used as an electron carrier. Besides Mg nanocomposites have also been synthesized by adding other metal salts to Rieke's reaction system.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, in all these investigations in which Mg nanoparticles were synthesized by chemical reduction, the possibility of controlling particle size and morphologies was not exploited and the morphology of the Mg particles synthesized did not significantly differ . In addition, all these reactions were carried out with either naphthalene, biphenyl, or phenanthrene as electron carriers and these can remain in the final material as by‐products limiting the achievable hydrogen capacity.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Magnesium Nanofibers by Electroless Reduction and their Hydrogen Interaction Properties

Sun

Aguey‐Zinsou

2016

Part & Part Syst Charact

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Magnesium (Mg) is successfully synthesized from the direct reduction of dibutylmagnesium (MgBu2) with calcium (Ca). By adding 1‐dodecanethiol, the morphology of the magnesium particles is controlled and magnesium nanofibers with a length of 0.4–4 µm and a width of 40 nm are obtained. Besides magnesium nanofibers, isolated irregular shaped calcium particles are also observed as a by‐product of the reaction. The nanofibers readily absorbed hydrogen at 300 °C and hydrogen release occurred at much lower temperatures (360 °C) compared to the equivalent bulk material. More remarkably, these nanofibers remain stable during hydrogen cycling, but they partially react with the remaining calcium to form the ternary hydride phase Ca19Mg8H54—a phase that is usually obtained at high temperatures >500 °C and hydrogen pressure 2500 MPa. Hydrogen absorption within these magnesium nanofibers shows a slightly lower enthalpy as compared to bulk magnesium. However, the hydrogen desorption properties are influenced by the presence of calcium and its reaction with magnesium.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Magnesium Nanofibers by Electroless Reduction and their Hydrogen Interaction Properties

Sun

Aguey‐Zinsou

2016

Part & Part Syst Charact

Self Cite

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“…: +420 532290422; fax: +420 541218657; e-mail address cermak@ipm.cz of the Mg particles (see e.g. [17]). Tuning the kinetic properties by catalyst additions [18] is also one of the possible ways to improve the application potential.…”

Section: Introductionmentioning

confidence: 99%

Influence of long-term ageing upon the capacity of hydrogen storage in two novel Mg-Ni-In-C alloys

Čermák¹,

Král²,

Roupcová³

2016

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We have shown previously that the addition of In and C enhances the hydrogen desorption capacity and considerably improves the kinetics of hydrogen desorption from Mg-Ni based alloys, important from the perspective of hydrogen storage. In this paper, we present the results of tests of the long-term stability of the sorption behaviour of these materials. We studied how the capacity and sorption kinetics changed 5 years from the preparation of two chosen Mg-Ni-In-C alloys differing in indium concentration. Kinetic curves and PCT isotherms were measured at temperatures of 250-350• C. It was found that long-term storage of the hydrogencharged samples led to no significant downgrade in hydrogen sorption kinetics. However, the absorption capacity somewhat decreased from about 5 wt.% H2 to about 3 wt.% H2 due to partial phase decomposition. Relatively intensive tentative oxidation during preparation, which had a slightly beneficial effect on the desorption rate of freshly-prepared samples, caused almost total blocking of hydrogen sorption in the aged samples.K e y w o r d s : hydrogen, hydrogen storage, magnesium alloys, indium

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Thermodynamic and Kinetic Regulation for Mg‐Based Hydrogen Storage Materials: Challenges, Strategies, and Perspectives

Wang,

Li,

Wei

et al. 2024

Adv Funct Materials

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Mg‐based hydrogen storage materials have drawn considerable attention as the solution for hydrogen storage and transportation due to their high hydrogen storage density, low cost, and high safety characteristics. However, their practical applications are hindered by the high dehydrogenation temperatures, low equilibrium pressure, and sluggish hydrogenation and dehydrogenation (de/hydrogenation) rates. These functionalities are typically determined by the thermodynamic and kinetic properties of de/hydrogenation reactions. This review comprehensively discusses how the compositeization, catalysts, alloying, and nanofabrication strategies can improve the thermodynamic and kinetic performances of Mg‐based hydrogen storage materials. Since the introduction of various additives leads the samples being a multiple‐phases and elements system, prediction methods of hydrogen storage properties are simultaneously introduced. In the last part of this review, the advantages and disadvantages of each approach are discussed and a summary of the emergence of new materials and potential strategies for realizing lower‐cost preparation, lower operation temperature, and long‐cycle properties is provided.

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Size effects and hydrogen storage properties of Mg nanoparticles synthesised by an electroless reduction method

Cited by 102 publications

References 39 publications

Synthesis of Magnesium Nanofibers by Electroless Reduction and their Hydrogen Interaction Properties

Synthesis of Magnesium Nanofibers by Electroless Reduction and their Hydrogen Interaction Properties

Influence of long-term ageing upon the capacity of hydrogen storage in two novel Mg-Ni-In-C alloys

Thermodynamic and Kinetic Regulation for Mg‐Based Hydrogen Storage Materials: Challenges, Strategies, and Perspectives

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