In operando study of TiVCr additive in MgH2 composites

Laversenne, L.; Andrieux, J.; Planté, Damien; Lyard, L.; Miraglia, S.

doi:10.1016/j.ijhydene.2013.06.111

Cited by 14 publications

(12 citation statements)

References 59 publications

(56 reference statements)

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“…The desorbing phase may be surrounded by an alternative phase and the tensile/compressive stress placed on the adjacent phase then acts as a driving force for destabilization. Signicant investigations have been undertaken to improve the hydrogen storage properties of Mg toward the requirements of practical applications, including Mg-Mg 2 Ni, 116 Mg-Ni-RE, 117 Mg-TiCrV, [118][119][120] Mg-LaNi x , 121,122 and Mg-TiB 2 /graphene nanosheets (GNSs). 123 Zaluska et al 116 reported the synergistic effects of desorption for mixtures of Mg 2 NiH 4 /MgH 2 phases prepared by ball-milling.…”

Section: Synergistic Effectmentioning

confidence: 99%

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

Zhang

et al. 2019

RSC Adv.

122

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Section: Synergistic Effectmentioning

confidence: 99%

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

Zhang

et al. 2019

RSC Adv.

122

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“…These values are much lower than the reported thermodynamic properties of MgH 2 . Consequently, we may probably propose that the synergistic effect of β-MgH 2 /Ti 0.16 Cr 0.24 V 0.6 H y phases could be the main reason for the improvements of thermodynamic properties.…”

Section: Resultsmentioning

confidence: 56%

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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“…The next category of catalyst material is not very different from the hydride materials, the only difference being their use in an unhydrided state in contrast with TiH 2 , NbH, or other complex hydrides. Several studies have focused on various alloys such as LaNi 5 [154], FeTi [155,156], Ti-V-Cr alloys [157][158][159][160], and Zr based alloys [161][162][163][164][165][166][167][168][169][170][171]. Vijay et al [155] studied the effect of FeTi and FeTiMn alloys in different proportions (5-40 wt%).…”

Section: Hydride Hydride Forming Alloys and Sulfide As Catalystmentioning

confidence: 99%

Catalytic Tuning of Sorption Kinetics of Lightweight Hydrides: A Review of the Materials and Mechanism

2018

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Hydrogen storage materials have been a subject of intensive research during the last 4 decades. Several developments have been achieved in regard of finding suitable materials as per the US-DOE targets. While the lightweight metal hydrides and complex hydrides meet the targeted hydrogen capacity, these possess difficulties of hard thermodynamics and sluggish kinetics of hydrogen sorption. A number of methods have been explored to tune the thermodynamic and kinetic properties of these materials. The thermodynamic constraints could be resolved using an intermediate step of alloying or by making reactive composites with other hydrogen storage materials, whereas the sluggish kinetics could be improved using several approaches such as downsizing and the use of catalysts. The catalyst addition reduces the activation barrier and enhances the sorption rate of hydrogen absorption/desorption. In this review, the catalytic modifications of lightweight hydrogen storage materials are reported and the mechanism towards the improvement is discussed.

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In operando study of TiVCr additive in MgH2 composites

Abstract: International audienc

Cited by 14 publications

References 59 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

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

Catalytic Tuning of Sorption Kinetics of Lightweight Hydrides: A Review of the Materials and Mechanism

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In operando study of TiVCr additive in MgH2 composites

Abstract: International audienc

Cited by 14 publications

References 59 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

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

Catalytic Tuning of Sorption Kinetics of Lightweight Hydrides: A Review of the Materials and Mechanism

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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