Effective thermodynamic alteration to Mg(NH<sub>2</sub>)<sub>2</sub>–LiH system: achieving near ambient-temperature hydrogen storage

Cao, Hujun; Wu, Guotao; Zhang, Yao; Xiong, Zhitao; Qiu, Jieshan; Chen, Ping

doi:10.1039/c4ta03505d

Cited by 38 publications

(35 citation statements)

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“…An interesting phenomenon was observed that there was a higher pressure slope in pressure composition isotherm (PCI) measurements of 2Mg(NH2)2-3LiH-LiBH4 composite than 2Mg(NH2)2-3LiH-1/3LiBH4 composite [36], which reveals the change of thermodynamic properties. Samples at this stage were analyzed by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and magic angle spinning nuclear magnetic resonance (MAS NMR).…”

Section: Introductionmentioning

confidence: 84%

“…Such a sharp dehydrogenation peak reflects a fast rate of dehydrogenation near the peak temperature. Furthermore, the dehydrogenation activation energies (Ea) of T2 sample and Tp sample were determined by the Kissinger's method [36]. Through the calculation, the activation energy (Ea) of T2 sample is 109 kJ/mol, which is lower than that of Tp (127 kJ/mol).…”

Section: The Hydrogen Desorption Properties Of 2mg(nh2)2-3lih-libh4 Cmentioning

confidence: 99%

“…Li et al [35] introduced 5 mol% LiBr to 2LiNH2-MgH2 composite and found certain effects on its thermodynamics and kinetics. In Cao's recentwork [36], thermodynamic properties of the dehydrogenation of 2Mg(NH2)2-3LiH composite were improved by stabilizing the dehydrogenated product, LiNH2, in Reaction (1). LiNH2 reacts with LiBH4, LiI and LiBr exothermically and forms more stable compounds, i.e., Li4(NH2)3BH4, Li3(NH2)2I, and Li2(NH2)Br; the reactions are as follows:…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 84%

Section: The Hydrogen Desorption Properties Of 2mg(nh2)2-3lih-libh4 Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…More recently, a strategy in improving the thermodynamic properties by forming a more stable intermediate has been developed. By introducing stoichiometric amounts of LiI, LiBr or LiBH 4 to the composite, hydrogen release at 0.1 MPa equilibrium pressure is thermodynamically allowed at 333, 320 or 337 K, respectively, which are tens of degrees Celsius lower than the neat composite [228] (see Fig. 11).…”

Section: Reactive Hydride Compositesmentioning

confidence: 99%

Complex and liquid hydrides for energy storage

et al. 2016

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The research on complex hydrides for hydrogen storage was initiated by the discovery of Ti as a hydrogen sorption catalyst in NaAlH 4 by Boris Bogdanovic in 1996. A large number of new complex hydride materials in various forms and combinations have been synthesized and characterized, and the knowledge regarding the properties of complex hydrides and the synthesis methods has grown enormously since then. A significant portion of the research groups active in the field of complex hydrides is collaborators in the International Energy Agreement Task 32. This paper reports about the important issues in the field of complex hydride research, i.e. the synthesis of borohydrides, the thermodynamics of complex hydrides, the effects of size and confinement, the hydrogen sorption mechanism and the complex hydride composites as well as the properties of liquid complex hydrides. This paper is the result of the collaboration of several groups and is an excellent summary of the recent achievements.

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“…Thirdly, LiBH 4 alters not only the kinetics but also the thermodynamics of Mg(NH 2 ) 2 + 2LiH [96,118]. Varying the molar ratio of Mg(NH 2 ) 2 , LiH and LiBH 4 , the optimum molar ratio of 6:9:1 was found [119]. The stabilization of LiNH 2 , the product of 6Mg(NH 2 ) 2 + 9LiH, by adding LiBH 4 (Equation (11) (11) To understand the reason for the high dehydrogenation plateau (PCI curves) at the starting stage of dehydrogenation of 6Mg(NH 2 ) 2 + 9LiH + LiBH 4 , a systematic investigation of the influence of the reactants ratios was carried out [120][121][122].…”

Section: Li-mg-n-h-borohydride Systemsmentioning

confidence: 93%

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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Effective thermodynamic alteration to Mg(NH₂)₂–LiH system: achieving near ambient-temperature hydrogen storage

Cited by 38 publications

References 50 publications

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

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

Complex and liquid hydrides for energy storage

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

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Effective thermodynamic alteration to Mg(NH2)2–LiH system: achieving near ambient-temperature hydrogen storage

Cited by 38 publications

References 50 publications

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

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

Complex and liquid hydrides for energy storage

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

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Product

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Effective thermodynamic alteration to Mg(NH₂)₂–LiH system: achieving near ambient-temperature hydrogen storage