Combined effects of molar ratio and ball milling energy on the phase transformations and mechanical dehydrogenation in the lithium amide-magnesium hydride (LiNH2 + nMgH2)(n = 0.5–2.0) nanocomposites

Parviz, Roozbeh; Varin, R.A.

doi:10.1016/j.ijhydene.2013.04.072

Cited by 24 publications

(19 citation statements)

References 28 publications

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“…To this regard, in order to improve the kinetic performance of the LiNH 2 -LiH system, several strategies have been proposed in the recent past, as the particle size reduction by high-energy ball milling and addition of metal catalysts [5][6][7][8][9]. Durojaiye and Goudy, demonstrated that the addition of KH to the 2LiNH 2 -MgH 2 system, decreased the desorption temperature with respect to the undoped system (75.3°C vs 109°C) while keeping similar gravimetric capacity of 5 wt.% [8].…”

Section: Introductionmentioning

confidence: 99%

Kinetic improvement on the CaH2-catalyzed Mg(NH2)2+ 2LiH system

Torre

Valentoni

Milanese

et al. 2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Kinetic improvement on the CaH2-catalyzed Mg(NH2)2+ 2LiH system

Torre

Valentoni

Milanese

et al. 2015

Journal of Alloys and Compounds

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“…In particular the CaBr 2 -doped system presents the lowest desorption onset and peak temperatures (80 • C and 135 • C, respectively) and an activation energy of 78.8 kJ/mol. Combined effect of ball milling and molar ratio LiNH 2 :MgH 2 on the sorption and structural process were studied by Varin et al [77,78]. The LiNH 2 + nMgH 2 (n = 0.55, 0.6 and 0.7) system is partially converted, by a metathesis reaction promoted by high-energy ball milling, into Mg(NH 2 ) 2 and LiH.…”

Section: Li-mg-n-h Systemmentioning

confidence: 99%

Recent Progress and New Perspectives on Metal Amide and Imide Systems for Solid-State Hydrogen Storage

et al. 2018

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Hydrogen storage in the solid state represents one of the most attractive and challenging ways to supply hydrogen to a proton exchange membrane (PEM) fuel cell. Although in the last 15 years a large variety of material systems have been identified as possible candidates for storing hydrogen, further efforts have to be made in the development of systems which meet the strict targets of the Fuel Cells and Hydrogen Joint Undertaking (FCH JU) and U.S. Department of Energy (DOE). Recent projections indicate that a system possessing: (i) an ideal enthalpy in the range of 20-50 kJ/mol H 2 , to use the heat produced by PEM fuel cell for providing the energy necessary for desorption; (ii) a gravimetric hydrogen density of 5 wt. % H 2 and (iii) fast sorption kinetics below 110 • C is strongly recommended. Among the known hydrogen storage materials, amide and imide-based mixtures represent the most promising class of compounds for on-board applications; however, some barriers still have to be overcome before considering this class of material mature for real applications. In this review, the most relevant progresses made in the recent years as well as the kinetic and thermodynamic properties, experimentally measured for the most promising systems, are reported and properly discussed.

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“…Changing the angular positions of one or two strong NdFeB magnets and altering the number of hard steel balls in a milling vial can control the milling energy in the magneto ball mill Uni-Ball-Mill 5 [3,[7][8][9][10]13]. As recently reported by Parviz et al [13], the quantity of milling energy, Q TR(R) per unit mass·hour (kJ/gh), which was injected into and stored in a milled powder for each particular milling mode with a fixed ball-to-powder mass ratio, R, in the magneto ball mill Uni-Ball-Mill 5, can be calculated via a semi-empirical method.…”

Section: Amorphous A-mn(bh 4 ) 2 -Type Hydride After Mechanochemical mentioning

confidence: 99%

“…As recently reported by Parviz et al [13], the quantity of milling energy, Q TR(R) per unit mass·hour (kJ/gh), which was injected into and stored in a milled powder for each particular milling mode with a fixed ball-to-powder mass ratio, R, in the magneto ball mill Uni-Ball-Mill 5, can be calculated via a semi-empirical method. In the present work, we solely used the milling mode IMP68-4B-R132 for 0.5 and 1 h with the constant total milling energy input, Q TR = 36.4 and 72.8 kJ/g, respectively (see Table 5 [13]).…”

Section: Amorphous A-mn(bh 4 ) 2 -Type Hydride After Mechanochemical mentioning

confidence: 99%

The Effects of Additives on the Dehydrogenation of Amorphous Manganese Borohydride and Its Crystalline Form after Solvent Filtration/Extraction

et al. 2017

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Abstract:A non-stoichiometric, amorphous a-Mn(BH 4 ) (2x) hydride, accompanied by a NaCl-type salt, was mechanochemically synthesized from the additive-free mixture of (2NaBH 4 + MnCl 2 ), as well as from the mixtures containing the additives of ultrafine filamentary carbonyl nickel (Ni), graphene, and LiNH 2 . It is shown that both graphene and LiNH 2 suppressed the release of B 2 H 6 during thermal gas desorption, with the LiNH 2 additive being the most effective suppressor of B 2 H 6 . During solvent filtration and extraction of additive-free, as well as additive-bearing, (Ni and graphene) samples from diethyl ether (Et 2 O), the amorphous a-Mn(BH 4 ) (2x) hydride transformed into a crystalline c-Mn(BH 4 ) 2 hydride, exhibiting a microstructure containing nanosize crystallites (grains). In contrast, the LiNH 2 additive most likely suppressed the formation of a crystalline c-Mn(BH 4 ) 2 hydride during solvent filtration/extraction. In a differential scanning calorimeter (DSC), the thermal decomposition peaks of both amorphous a-Mn(BH 4 ) (2x) and crystalline c-Mn(BH 4 ) 2 were endothermic for the additive-free samples, as well as the samples with added graphene and Ni. The samples with LiNH 2 exhibited an exothermic DSC decomposition peak.

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Combined effects of molar ratio and ball milling energy on the phase transformations and mechanical dehydrogenation in the lithium amide-magnesium hydride (LiNH2 + nMgH2)(n = 0.5–2.0) nanocomposites

Cited by 24 publications

References 28 publications

Kinetic improvement on the CaH2-catalyzed Mg(NH2)2+ 2LiH system

Kinetic improvement on the CaH2-catalyzed Mg(NH2)2+ 2LiH system

Recent Progress and New Perspectives on Metal Amide and Imide Systems for Solid-State Hydrogen Storage

The Effects of Additives on the Dehydrogenation of Amorphous Manganese Borohydride and Its Crystalline Form after Solvent Filtration/Extraction

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