The enhanced de/re-hydrogenation performance of MgH<sub>2</sub>
 with TiH<sub>2</sub>
 additive

Jangir, Mukesh; Jain, Ankur; Agarwal, Shivani; Zhang, Tengfei; Kumar, Sanjay; Selvaraj, Suganthamalar; Ichikawa, Takayuki; Jain, I.P.

doi:10.1002/er.3911

Cited by 54 publications

(12 citation statements)

References 28 publications

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“…The adapted Rieke method is considered as a better method for the preparation of nano-sized Mg with controllable sizes, and which can dope transition metal catalysts into a Mg/MgH 2 system by a simple chemical route. With regard to the nanoscaling, various catalysts for improving the hydrogen storage properties of MgH 2 have been investigated, such as transition metals/metal oxides/halogenides (Ma et al, 2009(Ma et al, , 2013Cui et al, 2014;Rizo-Acosta et al, 2018;Zhang et al, 2018;Liu et al, 2019b), rare earth metal oxides/halogenides (Singh et al, 2013;Lin et al, 2014Lin et al, , 2015Wang et al, 2015), carbon materials (Lukashev et al, 2006;Liu et al, 2013;Rather et al, 2016), and other hydrides (Lu et al, 2010;Terent'ev et al, 2015;Jangir et al, 2018). In addition, some noble metals, such as Pd, have been reported to be effective for facilitating hydrogenation of MgH 2 (Du et al, 2007;Callini et al, 2010;Ham et al, 2013;Chung et al, 2015;Liu et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

Magnesium Nanoparticles With Pd Decoration for Hydrogen Storage

et al. 2020

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“…Krishnan et al also observed that bimetallic Mg-Ti NPs grown by gas-phase condensation have better thermal stability against void formation (Nanoscale Kirkendall effect) and Mg evaporation [95]. Recent XRD and XPS studies showed that the TiH 2 phase remains unchanged during hydrogen desorption from MgH 2 without formation of intermediates [96]. In all these (MgH 2 ) y -(TiH 2 ) 1−y (nano)composites, the reversible hydrogen storage capacity originates only from the Mg+H 2 ↔MgH 2 reaction because TiH 2 is stable at the applied pressure-temperature conditions.…”

Section: Mg-ti Nanomaterialsmentioning

confidence: 99%

The Effects of Nanostructure on the Hydrogen Sorption Properties of Magnesium-Based Metallic Compounds: A Review

Pasquini

2018

Crystals

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In this review, I examine the influence of nanoscale materials features on the hydrogen-metal interaction. The small system size, the abundance of surfaces/interfaces, and the spatial distribution of phases are the key factors to understand the hydrogen sorption properties of nanomaterials. In order to describe nanoscale-specific thermodynamic changes, I present a composition and atomic quantitative model applicable to every hydride-forming material, independently on its structure. The effects of surface free energy, interface free energy, and elastic constraint, are included in a general expression for the thermodynamical bias. In the frame of this model, I critically survey theoretical and experimental results hinting at possible changes of thermodynamic parameters, and in particular, enthalpy and entropy of hydride formation, in nanostructured Mg-based metallic compounds as compared to their coarse-grained bulk counterparts. I discuss the still open controversies, such as destabilization of ultra-small clusters and enthalpy-entropy compensation. I also highlight the frequently missed points in experiments and data interpretation, such as the importance of recording full hydrogen absorption and desorption isotherms and of measuring the hysteresis. Finally, I try to address the open questions that may inspire future research, with the ambition of tailoring the properties of hydride nanomaterials through a deeper understanding of their thermodynamics.

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“…The use of hydride materials as catalyst for MgH 2 is led by TiH 2 [138][139][140][141][142][143][144]. The mixture of MgH 2 and TiH 2 in 7:1 molar ratio, prepared through high energy high pressure mechanical milling, showed drastic improvement of H 2 desorption kinetics and reduction in desorption temperature.…”

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

Self Cite

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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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The enhanced de/re-hydrogenation performance of MgH₂ with TiH₂ additive

Cited by 54 publications

References 28 publications

Magnesium Nanoparticles With Pd Decoration for Hydrogen Storage

Magnesium Nanoparticles With Pd Decoration for Hydrogen Storage

The Effects of Nanostructure on the Hydrogen Sorption Properties of Magnesium-Based Metallic Compounds: A Review

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

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The enhanced de/re-hydrogenation performance of MgH2 with TiH2 additive

Cited by 54 publications

References 28 publications

Magnesium Nanoparticles With Pd Decoration for Hydrogen Storage

Magnesium Nanoparticles With Pd Decoration for Hydrogen Storage

The Effects of Nanostructure on the Hydrogen Sorption Properties of Magnesium-Based Metallic Compounds: A Review

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

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The enhanced de/re-hydrogenation performance of MgH₂ with TiH₂ additive