Thermodynamic Modeling of Hydrogen Storage Capacity in Mg-Na Alloys

Abdessameud, S.; Mezbahul-Islam, M.; Medraj, Mamoun

doi:10.1155/2014/190320

Cited by 10 publications

(15 citation statements)

References 72 publications

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“…The constituent binary systems are modeled using the modified quasichemical model MQM for the liquid phase and the compound energy formalism for the solid solution phases. These binary systems are either taken from the literature [13][14][15] or from our previous work [2] or reassessed in the current work (AlNa). In many occasions, the models found in the literature were adjusted to suit dealing with hydrogen.…”

Section: Thermodynamic Description Of the Al-mg-na-h Systemmentioning

confidence: 99%

“…Mg-Na-H system was reviewed and modeled for the first time in our previous work [2]. The constituent binaries (Mg-Na, Mg-H, and Na-H) were remodeled using the MQM for the liquid phase and three hydrides, MgH 2 , NaH, and MgNaH 3 , were described in this system [2].…”

Section: Thermodynamic Description Of the Al-mg-na-h Systemmentioning

confidence: 99%

“…The constituent binaries (Mg-Na, Mg-H, and Na-H) were remodeled using the MQM for the liquid phase and three hydrides, MgH 2 , NaH, and MgNaH 3 , were described in this system [2]. The model parameters taken from [2] are used in this work.…”

Section: Thermodynamic Description Of the Al-mg-na-h Systemmentioning

confidence: 99%

“…However, it suffers from extremely slow hydriding kinetics and high decomposition temperature [1]. MgH 2 is predicted to decompose to hcp-Mg and H 2 at a temperature of 284.73°C and ambient pressure [2]. Many studies have shown the possibility of lowering the decomposition temperature of MgH 2 and/or improving its hydriding kinetics by mixing with other elements or compounds.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Abdessameud et al [2] performed thermodynamic modeling of the Mg-Na-H system and predicted its hydrogen storage properties over a wide range of temperatures and pressures. They [2] proved that the MgNaH 3 hydride does not affect the thermodynamics of MgH 2 and provided the best working conditions to benefit from its full catalytic role.…”

Section: Introductionmentioning

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: Thermodynamic Description Of the Al-mg-na-h Systemmentioning

confidence: 99%

Section: Thermodynamic Description Of the Al-mg-na-h Systemmentioning

confidence: 99%

Section: Thermodynamic Description Of the Al-mg-na-h Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Polyolefin‐Magnesium Interactions Performing Powder Injection Molding Process

Schaper¹,

Scharnagl²,

Wolff³

et al. 2018

Adv Eng Mater

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The introduction of magnesium into the metal injection molding (MIM) process has shown that sintering results are drastically influenced by the selection of the backbone polymer of the binder system. The polymer is needed to ensure the shape stability after injection molding until the sintering process begins. Using polyethylene (PE) based polymers result in a strong sintering inhibiting effect while polypropylene (PP) based polymers do not show such a negative influence on the sintering of the magnesium powder. This work displays a systematic investigation why these two polyolefins show such a strong difference when used as backbone polymers for MIM of magnesium. According to the literature, PE decomposes mainly into 1-alkenes and n-alkanes while PP decomposes into branched iso-alkenes and iso-alkanes. The different thermal decomposition products of PE react with magnesium forming metastable carbides that decompose into carbon. Carbon can act as a barrier between neighboring powder particles inhibiting the sintering process. The decomposition products of PP do not react in the same extent leading to the fact that sintering is still possible. The negative effect of the carbon can be reversed when hydrogen is used as a sintering atmosphere resulting in improved sintering even when PE is used.

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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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Thermodynamic Modeling of Hydrogen Storage Capacity in Mg-Na Alloys

Cited by 10 publications

References 72 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

Polyolefin‐Magnesium Interactions Performing Powder Injection Molding Process

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

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