Mechanochemical synthesis of hydrogen-storage materials based on aluminum, magnesium and their compounds

Hlova, Ihor Z.

doi:10.31274/etd-180810-4121

Cited by 3 publications

(3 citation statements)

References 115 publications

(158 reference statements)

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“…Despite the significant progress achieved with respect to the kinetics of hydrogen absorption/desorption in magnesium, its stable thermodynamic property is still the main drawback, which hinders its practical applications. 126,127 In this review, we summarized the effective measures to alter the hydrogen storage properties of MgH 2 , such as alloying, nanostructuring, metastable phase formation, changing reaction paths and synergistic effects. However, all of these strategies have limitations.…”

Section: Discussionmentioning

confidence: 99%

Recent advances on the thermal destabilization of Mg-based hydrogen storage materials

Zhang

et al. 2019

RSC Adv.

125

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Section: Discussionmentioning

confidence: 99%

Recent advances on the thermal destabilization of Mg-based hydrogen storage materials

Zhang

et al. 2019

RSC Adv.

125

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“…This absence of data can be related to the instability of some alanates and the consequent difficulty of their synthesis. Among the examples is the work of Hlova et al [36,37,38]. They produced the reaction of LiH with AlCl 3 or NaH with AlCl 3 in several molar proportions, with the objective of forming AlH 3 .…”

Section: General Syntheses Proceduresmentioning

confidence: 99%

Alanates, a Comprehensive Review

2019

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Hydrogen storage is widely recognized as one of the biggest not solved problem within hydrogen technologies. The slow development of the materials and systems for hydrogen storage has resulted in a slow spread of hydrogen applications. There are many families of materials that can store hydrogen; among them, the alanate family can be of interest. Basic research papers and reviews have been focused on alanates of group 1 and 2. However, there are many alanates of transition metals, main group, and lanthanides that deserve attention in a review. This work is a comprehensive compilation of all known alanates. The approaches towards tuning the kinetics and thermodynamics of alanates are also covered in this review. These approaches are the formation of reactive composites, double cation alanates, or anion substitution. The crystallographic and X-ray diffraction characteristics of each alanate are presented along with this review. In the final sections, a discussion of the infrared, Raman, and thermodynamics was included.

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“…In this respect, reactive ball milling (RBM) has been widely used to modify the chemical properties of MgH 2 or synthesize Mg-based composite materials. , The advantages of RBM for the synthesis of hydrogen storage materials are the ease of hydrogenation of Mg-based alloys at room temperature, the generation of a fresh and highly reactive surface, and the ease of formation of multiphase nanocomposites or creating more defects and microstrains in the crystal lattice. Especially, it is capable of generating high content of metastable phases due to mechanical ball milling under a hydrogen atmosphere .…”

Section: Introductionmentioning

confidence: 99%

Significant Thermodynamic Destabilization and Superior Hydrogen Storage Properties of Nanocrystalline Mg-20 wt % Ti–Cr–V_x (x = 0.4, 0.6, 0.8; Ti/Cr = 2:3) Composites Synthesized by Reactive Ball Milling

Zhang

et al. 2019

J. Phys. Chem. C

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Nanocrystalline Mg-20 wt % Ti−Cr−V x (x = 0.4, 0.6, 0.8; Ti/Cr = 2:3) composites were synthesized by reactive ball milling of Mg and Ti−Cr−V x powders for 8 h under 5.0 MPa H 2 at room temperature. The morphology, crystal structure, and isothermal hydrogen ab-/desorption properties of the materials were investigated. The as-synthesized nanocomposites comprise β-MgH 2 , γ-MgH 2 , and Ti−Cr−V x −H y (1.88 < y < 1.92) as confirmed by X-ray diffraction analysis. High-resolution transmission electron microscopy images show that both β-MgH 2 and γ-MgH 2 co-existed in a single nanocrystalline. Differential scanning calorimetry results reveal that Mg-20 wt % Ti 0.16 Cr 0.24 V 0.6 powders possess the lowest hydrogen desorption temperature at 224 °C with the apparent activation energy of 76.32 kJ/mol for dehydrogenation. The nanocrystalline Mg-20 wt % Ti 0.16 Cr 0.24 V 0.6 powders exhibit excellent dehydrogenation kinetics. They can desorb 5.67 wt % H 2 in 20 min at 270 °C under 0.01 MPa H 2 pressure, compared with only 0.10 wt % H 2 for a pure Mg sample under the same preparation and measurement conditions. More remarkably, the presence of γ-MgH 2 is found to lead to a significant reduction of reaction enthalpy from 74.8 to 54.16 kJ/(mol•H 2 ) for the Mg-20 wt % Ti 0.16 Cr 0.24 V 0.6 powders. The thermodynamic destabilization and superior hydrogen storage properties of the nanocomposite can be attributed to the synergistic desorption effect co-existing in the nanocomposite γ-MgH 2 /β-MgH 2 /Ti 0.16 Cr 0.24 V 0.6 H y phases as well as the high content of γ-MgH 2 (35.4 wt %). Furthermore, cycling results show that the metastable γ-MgH 2 phase still exists after several cycles at selected temperatures ranging from 225 to 255 °C, which is important for improving the thermodynamic properties of the composite, whereas the content of γ-MgH 2 decreased with the increasing de-/absorption cycles. However, this sheds light on the ways to further improve the thermodynamic properties of magnesium-based composites.

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Mechanochemical synthesis of hydrogen-storage materials based on aluminum, magnesium and their compounds

Cited by 3 publications

References 115 publications

Recent advances on the thermal destabilization of Mg-based hydrogen storage materials

Recent advances on the thermal destabilization of Mg-based hydrogen storage materials

Alanates, a Comprehensive Review

Significant Thermodynamic Destabilization and Superior Hydrogen Storage Properties of Nanocrystalline Mg-20 wt % Ti–Cr–V_x (x = 0.4, 0.6, 0.8; Ti/Cr = 2:3) Composites Synthesized by Reactive Ball Milling

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Mechanochemical synthesis of hydrogen-storage materials based on aluminum, magnesium and their compounds

Cited by 3 publications

References 115 publications

Recent advances on the thermal destabilization of Mg-based hydrogen storage materials

Recent advances on the thermal destabilization of Mg-based hydrogen storage materials

Alanates, a Comprehensive Review

Significant Thermodynamic Destabilization and Superior Hydrogen Storage Properties of Nanocrystalline Mg-20 wt % Ti–Cr–Vx (x = 0.4, 0.6, 0.8; Ti/Cr = 2:3) Composites Synthesized by Reactive Ball Milling

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Significant Thermodynamic Destabilization and Superior Hydrogen Storage Properties of Nanocrystalline Mg-20 wt % Ti–Cr–V_x (x = 0.4, 0.6, 0.8; Ti/Cr = 2:3) Composites Synthesized by Reactive Ball Milling