Facile preparation of β-/γ-MgH<sub>2</sub> nanocomposites under mild conditions and pathways to rapid dehydrogenation

Xiao, Xuezhang; Liu, Zhe; Saremi‐Yarahmadi, Sina; Gregory, Duncan H.

doi:10.1039/c5cp07762a

Cited by 41 publications

(27 citation statements)

References 36 publications

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“…Taking advantage of MgH2 NPs with a relatively high surface energy as heterogeneous sites, which exhibits favorable adsorption of tetrahydrofuran (THF) containing LiBH4 [25] , and the hydrophobic nature of graphene, which is incompatible with THF [26,27] [ 31,32] Interestingly, the enthalpy changes of dehydrogenation of 2LiBH4-MgH2 nanocomposite are calculated to be ~46.8 kJ mol -1 H2, which is significantly lower than the relative value of the bulk counterpart attributed to the favorable formation of In the light of these observations, the superior hydrogen storage performance and cycling stability of graphene-supported 2LiBH4-MgH2 nanocomposite can be mainly ascribed to several unique features. First, the high surface area of graphene and the unique self-assembly strategy make it possible to realize the high loading of uniform MgH2 NPs and hence LiBH4 NPs, which ensures the high capacity of the system (Figure 1).…”

Section: Resultsmentioning

confidence: 99%

Graphene-wrapped reversible reaction for advanced hydrogen storage

Xia

Tan

et al. 2016

Nano Energy

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X. (2016). Graphene-wrapped reversible reaction for advanced hydrogen storage. Nano Energy, 26 488-495. Graphene-wrapped reversible reaction for advanced hydrogen storage AbstractHere, we report the fabrication of a graphene-wrapped nanostructured reactive hydride composite, i.e., 2LiBH4-MgH2, made by adopting graphene-supported MgH2 nanoparticles (NPs) as the nanoreactor and heterogeneous nucleation sites. The porous structure, uniform distribution of MgH2 NPs, and the steric confinement by flexible graphene induced a homogeneous distribution of 2LiBH4-MgH2 nanocomposite on graphene with extremely high loading capacity (80 wt%) and energy density. The well-defined structural features, including even distribution, uniform particle size, excellent thermal stability, and robust architecture endow this composite with significant improvements in its hydrogen storage performance. For instance, at a temperature as low as 350 °C, a reversible storage capacity of up to 8.9 wt% H2, without degradation after 25 complete cycles, was achieved for the 2LiBH4-MgH2 anchored on graphene. The design of this threedimensional architecture can offer a new concept for obtaining high performance materials in the energy storage field. AbstractHere, we report the fabrication of a graphene-wrapped nanostructured reactive hydride composite, i.e., 2LiBH4-MgH2, made by adopting graphene-supported MgH2 nanoparticles (NPs) as the nanoreactor and heterogeneous nucleation sites. The porous structure, uniform distribution of MgH2 NPs, and the steric confinement by flexible graphene induced a homogeneous distribution of 2LiBH4-MgH2 nanocomposite on graphene with extremely high loading capacity (80 wt%) and energy density. The well-defined structural features, including even distribution, uniform particle size, excellent thermal stability, and robust architecture endow this composite with significant improvements in its hydrogen storage performance. For instance, at a temperature as low as 350 o C, a reversible storage capacity of up to 8.9wt.% H2, without degradation after 25 complete cycles, was achieved for the 2LiBH 4 -MgH 2 anchored on graphene. The design of this three-dimensional architecture can offer a new concept for obtaining high performance materials in the energy storage field.

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Section: Resultsmentioning

confidence: 99%

Graphene-wrapped reversible reaction for advanced hydrogen storage

Xia

Tan

et al. 2016

Nano Energy

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“…91 Apart from doping MgH 2 powders with catalysts, it has been experimentally demonstrated by some authors that changing the crystal structure of the stable b-tetragonal MgH 2 phase to a less stable phase of g-orthorhombic MgH 2 leads to improved gas uptake/ release kinetics and a decrease in the hydrogenation temperature without a drastic decrease in the storage capacity. [91][92][93] b-to-g phase transformations can be attained via severe plastic deformation (SPD) 94 at ambient temperature using different approaches such as HEBM, 95 cold rolling, 96 equal channel angular pressing (ECAP), 97 and high pressure torsion (HPT). 98 Commonly the results of these employed techniques demonstrated that formation of a nanocrystalline phase along with introducing high intensity defects, leads to an increase of the density of the grain boundaries.…”

Section: Development Of High Performance Pure Mgh 2 By Severe Plasticmentioning

confidence: 99%

Recent developments in the fabrication, characterization and implementation of MgH₂-based solid-hydrogen materials in the Kuwait Institute for Scientific Research

El‐Eskandarany

2019

RSC Adv.

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“…proposed that a high density of defects may form in the Mg lattice through the adapted Rieked method. In addition,Xiao et al (2016) synthesized β-/γ-MgH 2 nanocomposites via a simple wet chemical route by ball milling MgH 2 with LiCl as an additive at room temperature followed by THF treatment and revealed that THF solution plays a vital role in the synthesis of the γ-MgH 2 phase. In this work, high-density defects formed in the nanocomposite and THF solution effect may contribute to the formation of the γ-MgH 2 phase at lower temperature.…”

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Magnesium Nanoparticles With Pd Decoration for Hydrogen Storage

et al. 2020

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In this work, Magnesium nanoparticles with Pd decoration, ranging from 40 to 70 nm, were successfully coprecipitated from tetrahydrofuran (THF) solution, assigned as the Mg-Pd nanocomposite. The Mg-Pd nanocomposite exhibits superior hydrogen storage properties. For the hydrogenated Mg-Pd nanocomposite at 150 • C, the onset dehydrogenation temperature is significantly reduced to 216.8 • C, with a lower apparent activation energy for dehydrogenation of 93.8 kJ/mol H 2 . High-content γ-MgH 2 formed during the hydrogenation process, along with PH 0.706 , contributes to the enhancing of desorption kinetics. The Mg-Pd nanocomposite can take up 3.0 wt% hydrogen in 2 h at a temperature as low as 50 • C. During lower hydrogenation temperatures, Pd can dissociate hydrogen and create a hydrogen diffusion pathway for the Mg nanoparticles, leading to the decrease of the hydrogenation apparent activation energy (44.3 kJ/mol H 2 ). In addition, the Mg-Pd alloy formed during the hydrogenation/dehydrogenation process can play an active role in the reversible metal hydride transformation, destabilizing the MgH 2 .

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Facile preparation of β-/γ-MgH₂ nanocomposites under mild conditions and pathways to rapid dehydrogenation

Cited by 41 publications

References 36 publications

Graphene-wrapped reversible reaction for advanced hydrogen storage

Graphene-wrapped reversible reaction for advanced hydrogen storage

Recent developments in the fabrication, characterization and implementation of MgH₂-based solid-hydrogen materials in the Kuwait Institute for Scientific Research

Magnesium Nanoparticles With Pd Decoration for Hydrogen Storage

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Facile preparation of β-/γ-MgH2 nanocomposites under mild conditions and pathways to rapid dehydrogenation

Cited by 41 publications

References 36 publications

Graphene-wrapped reversible reaction for advanced hydrogen storage

Graphene-wrapped reversible reaction for advanced hydrogen storage

Recent developments in the fabrication, characterization and implementation of MgH2-based solid-hydrogen materials in the Kuwait Institute for Scientific Research

Magnesium Nanoparticles With Pd Decoration for Hydrogen Storage

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Product

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Facile preparation of β-/γ-MgH₂ nanocomposites under mild conditions and pathways to rapid dehydrogenation

Recent developments in the fabrication, characterization and implementation of MgH₂-based solid-hydrogen materials in the Kuwait Institute for Scientific Research