Li–Mg–N–H: Recent investigations and development

Luo, Wei; Wang, Jim; Stewart, Kenneth D.; Clift, Miles; Gross, Karl

doi:10.1016/j.jallcom.2006.11.067

Cited by 41 publications

(39 citation statements)

References 19 publications

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“…For the rehydrogenation sample, the main phases are Mg(NH 2 ) 2 and LiH, which is in good agreement with the results given in Ref. [2][3][4][5][6]. For the dehydrogenated sample, there is mainly a new phase with the Li 2 MgN 2 H 2 chemical formula, which was also proposed in Ref.…”

Section: Phase and Microstructure Characteristicssupporting

confidence: 90%

“…However, its slow dehydrogenation kinetics and high dehydrogenation temperature set a big barrier for commercial application [2][3]. Thereafter, Li-Mg-N-H hydrogen storage materials were designed [4][5][6][7][8], in which Li was partly substituted by Mg to improve the dehydrogenation properties of the Li-N-H system. The re-/de-hydrogenation reactions of the Mg(NH 2 ) 2 + 2LiH mixture could be described by the following reactions:…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Ti-Cr-V BCC alloys on the dehydrogenation kinetics of Li-Mg-N-H hydrogen storage materials

Wang

et al. 2010

Rare Metals

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The hydrogen storage properties of a Li-Mg-N-H material doped by a 4 mol.% Ti 3 Cr 3 V 4 body centre cubic (BCC) alloy hydride and prepared with a ball-milling method were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Sievert's technology test. The results show that the Ti 3 Cr 3 V 4 BCC alloy hydride/Li-Mg-N-H composite has good reversible hydrogen storage properties. The dehydrogenation kinetics of the Li-Mg-N-H system can be greatly improved by doping the Ti 3 Cr 3 V 4 BCC alloy hydride. The composite desorbed 4.1 wt.% hydrogen in the first 60 min at 473 K under 0.1 MPa pressure, but when without the BCC alloy addition, only 3.0 wt.% hydrogen was desorbed under the same dehydrogenation condition. It can be deduced that the Ti 3 Cr 3 V 4 BCC alloy uniformly distributed in the Li-Mg-N-H substrate could decrease the activating energy of hydrogen molecules to H atoms and increase H diffusion paths in the composite, enhancing the dehydrogenation kinetics of the Li-Mg-N-H system.

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Section: Phase and Microstructure Characteristicssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Enhancement of Ti-Cr-V BCC alloys on the dehydrogenation kinetics of Li-Mg-N-H hydrogen storage materials

Wang

et al. 2010

Rare Metals

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“…Numerous solid-state hydrogen storage materials have been developed to store hydrogen in an energy or volume efficient way [2]. Complex hydrides, e.g., alanates [3][4][5], borohydrides [6][7][8], and amide-hydride systems [9][10][11][12][13][14][15][16][17][18][19][20] are promising to OPEN ACCESS fulfill the on-board hydrogen storage requirements. In particular, a number of amide-hydride systems, such as Li-N-H [10], Li-Mg-N-H [11,13,[17][18][19][20], Li-Ca-N-H [14], Li-Al-N-H [15], Mg-N-H [12], Ca-N-H [16], and so on [9,14,21,22] have been investigated since 2002.…”

Section: Introductionmentioning

confidence: 99%

The improved Hydrogen Storage Performances of the Multi-Component Composite: 2Mg(NH2)2–3LiH–LiBH4

Wang

Cao

et al. 2015

Energies

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2Mg(NH2)2-3LiH-LiBH4 composite exhibits an improved kinetic and thermodynamic properties in hydrogen storage in comparison with 2Mg(NH2)2-3LiH. The peak temperature of hydrogen desorption drops about 10 K and the peak width shrinks about 50 K compared with the neat 2Mg(NH2)2-3LiH. Its isothermal dehydrogenation and re-hydrogenation rates are respectively 2 times and 18 times as fast as those of 2Mg(NH2)2-3LiH. A slope desorption region with higher equilibrium pressure is observed. By means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) analyses, the existence of Li2BNH6 is identified and its roles in kinetic and thermodynamic enhancement are discussed.

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“…In the first dehydrogenation cycle, the desorption rate is significantly slower than the subsequent three runs, ascribable to the fact that, in the first one, there is an interaction between the LiNH 2 and MgH 2 . The sorption mechanism, summarized in Figure 4, has been further investigated by Sickafoose et al [54] In the first step of the isotherm, one hydrogen atom is inserted into the Li 2 Luo et al [55,56] determined the NH 3 emission in the desorption step of the 2LiNH 2 + MgH 2 system. The results indicate that the NH 3 concentration is around 180 ppm at 180 • C and 720 ppm at 240 • C, restricting the cycling and then the applicability.…”

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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Li–Mg–N–H: Recent investigations and development

Cited by 41 publications

References 19 publications

Enhancement of Ti-Cr-V BCC alloys on the dehydrogenation kinetics of Li-Mg-N-H hydrogen storage materials

Enhancement of Ti-Cr-V BCC alloys on the dehydrogenation kinetics of Li-Mg-N-H hydrogen storage materials

The improved Hydrogen Storage Performances of the Multi-Component Composite: 2Mg(NH2)2–3LiH–LiBH4

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

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