Synthesis and hydrogen storage thermodynamics and kinetics of Mg(AlH4)2 submicron rods

Liu, Yongfeng; Pang, Yuepeng; Zhang, Xin; Zhou, Yifan; Gao, Mingxia; Pan, Hongge

doi:10.1016/j.ijhydene.2012.09.081

Cited by 36 publications

(26 citation statements)

References 28 publications

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“…Hydrogen storage behavior in the Al-Mg-Na-H system The Al-Mg-H system Recently, Liu et al [41] investigated the decomposition reaction of Mg(AlH 4 ) 2 using TPD, DSC, and XRD. They [41] reported that, after the first exothermic peak, two dehydrogenation overlapping endothermic peaks were observed.…”

Section: The Al-mg-na Systemmentioning

confidence: 99%

“…They [41] reported that, after the first exothermic peak, two dehydrogenation overlapping endothermic peaks were observed. XRD measurements at 200, 280, and 320°C showed that diffraction peaks of Al shifted toward lower angles indicating the increase of solubility of Mg in the Al phase.…”

Section: The Al-mg-na Systemmentioning

confidence: 99%

“…XRD measurements at 200, 280, and 320°C showed that diffraction peaks of Al shifted toward lower angles indicating the increase of solubility of Mg in the Al phase. According to these authors [41], the overall dehydrogenation reaction proceeds as follows (with the first reaction as exothermic):…”

Section: The Al-mg-na Systemmentioning

confidence: 99%

“…In these equations, Liu et al [41] referred to fcc-Al as Al 0.9 Mg 0.1 by taking into account the value of the maximum solubility of Mg in fcc-Al at 320°C as 10 at%. After recharging at 120-210°C and 100 bar of hydrogen pressure, only MgH 2 and Al were formed [41].…”

Section: The Al-mg-na Systemmentioning

confidence: 99%

“…In fact, Palumbo et al [34] calculated a temperature of 230°C for reaction (2), and values in the range 217-240°C have been reported using DSC experiments [36][37][38]. As mentioned in ''AlMg-H system'', Liu et al [41] expressed fcc-Al as Al 0.9-Mg 0.1 in Eq. (5) by taking into account the value of the maximum solubility of Mg in fcc-Al at 320°C as 10 at%.…”

Section: The Al-mg-h Systemmentioning

confidence: 99%

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Understanding the hydrogen storage behavior of promising Al–Mg–Na compositions using thermodynamic modeling

Abdessameud

Medraj

2016

Mater Renew Sustain Energy

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Thermodynamic modeling of the Al-Mg-Na-H system is performed in this work to understand the phase relationships and reaction mechanisms in this system. The Al-Na system is reassessed using the modified quasichemical model for the liquid phase. All the terminal solid solutions were remodeled using the compound energy formalism. The thermodynamic properties of the ternary systems are estimated from the models of the binary systems and the ternary compound using the CALPHAD method. The reaction pathways for the systems MgH 2 / AlH 3 , MgH 2 /NaAlH 4 , and MgH 2 /Na 3 AlH 6 are calculated and compared to the experimental data from the literature. Details about the reaction mechanisms and temperatures, the amount of the products, and their composition are revealed and discussed in this work. The calculations show that in the composites MgH 2 /NaAlH 4 and MgH 2 /Na 3 AlH 6 , the components spontaneously destabilize mutually in specific relative amounts by forming NaMgH 3 , which may play only a catalytic role on the decomposition of (MgH 2 ? Al) mixture, NaAlH 4 , or Na 3 AlH 6 . Also, Al destabilizes MgH 2 and NaMgH 3 by forming b phase and reducing the decomposition temperatures of these hydrides by more than 50°C. The constructed database is successfully used to reproduce the pressure-composition isotherms (PCIs) for Mg-10 at% Al and Mg-4 at% Al alloys at 350°C. The results provide a better understanding of the reaction mechanisms in the PCIs found in the literature concerning the number of plateau pressures and their sloping. It is shown that the first plateau pressure observed during the PCIs of Al-Mg alloys depends on Al content and is higher than that of pure Mg. This difference is due to Al solubility in hcp-Mg.

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Section: The Al-mg-na Systemmentioning

confidence: 99%

Section: The Al-mg-na Systemmentioning

confidence: 99%

Section: The Al-mg-na Systemmentioning

confidence: 99%

Section: The Al-mg-na Systemmentioning

confidence: 99%

Section: The Al-mg-h Systemmentioning

confidence: 99%

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Understanding the hydrogen storage behavior of promising Al–Mg–Na compositions using thermodynamic modeling

Abdessameud

Medraj

2016

Mater Renew Sustain Energy

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How to Design Hydrogen Storage Materials? Fundamentals, Synthesis, and Storage Tanks

Lai

Sun

Wang

et al. 2019

Advanced Sustainable Systems

116

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Composition‐Dependent Reaction Pathways and Hydrogen Storage Properties of LiBH₄/Mg(AlH₄)₂ Composites

Pang

Liu

Zhang

et al. 2015

Chemistry An Asian Journal

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Herein, an initial attempt to understand the relationships between hydrogen storage properties, reaction pathways, and material compositions in LiBH4-x Mg(AlH4)2 composites is demonstrated. The hydrogen storage properties and the reaction pathways for hydrogen release from LiBH4-x Mg(AlH4)2 composites with x=1/6, 1/4, and 1/2 were systematically investigated. All of the composites exhibit a four-step dehydrogenation event upon heating, but the pathways for hydrogen desorption/absorption are varied with decreasing LiBH4/Mg(AlH4)2 molar ratios. Thermodynamic and kinetic investigations reveal that different x values lead to different enthalpy changes for the third and fourth dehydrogenation steps and varied apparent activation energies for the first, second, and third dehydrogenation steps. Thermodynamic and kinetic destabilization caused by the presence of Mg(AlH4)2 is likely to be responsible for the different hydrogen desorption/absorption performances of the LiBH4-x Mg(AlH4)2 composites.

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Synthesis and hydrogen storage thermodynamics and kinetics of Mg(AlH4)2 submicron rods

Cited by 36 publications

References 28 publications

Understanding the hydrogen storage behavior of promising Al–Mg–Na compositions using thermodynamic modeling

Understanding the hydrogen storage behavior of promising Al–Mg–Na compositions using thermodynamic modeling

How to Design Hydrogen Storage Materials? Fundamentals, Synthesis, and Storage Tanks

Composition‐Dependent Reaction Pathways and Hydrogen Storage Properties of LiBH₄/Mg(AlH₄)₂ Composites

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Synthesis and hydrogen storage thermodynamics and kinetics of Mg(AlH4)2 submicron rods

Cited by 36 publications

References 28 publications

Understanding the hydrogen storage behavior of promising Al–Mg–Na compositions using thermodynamic modeling

Understanding the hydrogen storage behavior of promising Al–Mg–Na compositions using thermodynamic modeling

How to Design Hydrogen Storage Materials? Fundamentals, Synthesis, and Storage Tanks

Composition‐Dependent Reaction Pathways and Hydrogen Storage Properties of LiBH4/Mg(AlH4)2 Composites

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Composition‐Dependent Reaction Pathways and Hydrogen Storage Properties of LiBH₄/Mg(AlH₄)₂ Composites