Hydrogen storage properties of nano-structured 0.65MgH2/0.35ScH2

Luo, Xuanli; Grant, David M.; Walker, Gavin S.

doi:10.1016/j.ijhydene.2012.10.025

Cited by 24 publications

(4 citation statements)

References 29 publications

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“…Another common approach to obtaining E a is the Kissinger method . This method is usually used to determine the activation energy from nonisothermal (de)hydrogenation reaction data with different heating rates, typically using differential scanning calorimetry (DSC) systems, and has been widely used in hydrogen storage research. ,,,,, The linearized Kissinger eq , in which A is a constant, assumes a constant heating rate, β, leading to a temperature at which the maximum rate occurs, T m , seen as a peak in a DSC curve which shifts to higher values as β increases. Kissinger analysis has the advantage of requiring fewer measurements overall.…”

Section: Methods To Analyze Structure and Storage Propertiesmentioning

confidence: 99%

“…One of the most-used techniques to reduce the particle size in metal hydrides is ball milling, which involves the mechanical grinding of a solid sample with one or more inert and hard balls (e.g., ceramic, flint, tungsten carbide, or stainless steel) moving at a high speed and crushing the powder. Under certain regimes, the resulting materials are mostly composed of small NPs or nanocrystallites. − The “NPs” derived from mechanochemical processes are different compared to particles formed via solvent-based chemistry approaches and tend to contain gross internal grain boundaries, fractures, dislocations, or internal disorder, whether the crystals they contain are nanocrystalline or not. For brittle materials, particle fracture is well-described by Griffith theory, which shows the relationship between applied nominal stress and crack length at fracture.…”

Section: Synthetic Routesmentioning

confidence: 99%

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Nanostructured Metal Hydrides for Hydrogen Storage

et al. 2018

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Knowledge and foundational understanding of phenomena associated with the behavior of materials at the nanoscale is one of the key scientific challenges toward a sustainable energy future. Size reduction from bulk to the nanoscale leads to a variety of exciting and anomalous phenomena due to enhanced surface-to-volume ratio, reduced transport length, and tunable nanointerfaces. Nanostructured metal hydrides are an important class of materials with significant potential for energy storage applications. Hydrogen storage in nanoscale metal hydrides has been recognized as a potentially transformative technology, and the field is now growing steadily due to the ability to tune the material properties more independently and drastically compared to those of their bulk counterparts. The numerous advantages of nanostructured metal hydrides compared to bulk include improved reversibility, altered heats of hydrogen absorption/desorption, nanointerfacial reaction pathways with faster rates, and new surface states capable of activating chemical bonds. This review aims to summarize the progress to date in the area of nanostructured metal hydrides and intends to understand and explain the underpinnings of the innovative concepts and strategies developed over the past decade to tune the thermodynamics and kinetics of hydrogen storage reactions. These recent achievements have the potential to propel further the prospects of tuning the hydride properties at nanoscale, with several promising directions and strategies that could lead to the next generation of solid-state materials for hydrogen storage applications.

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Section: Methods To Analyze Structure and Storage Propertiesmentioning

confidence: 99%

Section: Synthetic Routesmentioning

confidence: 99%

Nanostructured Metal Hydrides for Hydrogen Storage

et al. 2018

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“…The following parameters were varied during the course of these studies:  Type of the main starting component in the charge: individual Mg [44,45,98,99,175,[194][195][196][197], Mg alloys [175,[198][199][200][201][202][203], or MgH 2 [63,184,188,[203][204][205][206];  Catalytic additives (see present review);  Milling medium: inert gas (mostly, argon [45,98,99,187,194,206], less frequently N 2 [164,207,208] or He [199]), hydrogen [44,175,185,197], or organic liquid [164,209]. Sometimes the milling was carried out in vacuum [210] or even in air without any protective atmosphere [211,212].…”

Section: Nanostructured Mg-based Hydrogen Storage Materials Prepared ...mentioning

confidence: 99%

Magnesium based materials for hydrogen based energy storage: Past, present and future

Yartys

Lototskyy

Akiba

et al. 2019

International Journal of Hydrogen Energy

560

211

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“…Can the lightest transition metal Sc improve the shortcomings of MgH 2 in hydrogen storage? The previous experimental study has shown that Mg 0.65 Sc 0.35 has high stability and reversible hydrogen storage capacity (4.3 wt %). However, there are few theoretical studies on the mechanism and performance of Sc doping in MgH 2 hydrogen storage.…”

Section: Introductionmentioning

confidence: 96%

Structures and Electronic and Hydrogen Storage Properties of Magnesium Scandium Hydrides

et al. 2022

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MgH 2 is well known as a potential hydrogen storage material. However, its high thermodynamic stability, high dissociation temperature, slow absorption, and desorption kinetics severely limit its application. Aiming at these shortcomings, we try to improve the hydrogen storage property of MgH 2 by doping with transition metal Sc atoms. The structures and electronic and hydrogen storage properties of Mg−Sc−H systems have been systematically studied by combining the crystal structure analysis by particle swarm optimization and density functional theory method. The results show that the structure of MgScH 8 with the R3 space group is the most stable one, which is proved to be a wide-band gap (2.96 eV) semiconductor. The possible decomposition pathways, which are crucial for the applicability of R3-MgScH 8 as a hydrogen storage material, are studied, and the pathway of MgScH 8 → ScH 6 + Mg + H 2 is found to be the most favorable one under 107.8 GPa pressure, while above 107.8 GPa, MgScH 8 → Mg + Sc + 4H 2 becomes the most thermodynamically stable pathway and releases the maximum amount of hydrogen. Based on the root mean square deviation calculation, it is found that R3-MgScH 8 begins to melt at 400 K. The result of ab initio molecular dynamics simulations shows that the hydrogen release capacity (4.04 wt %) can be easily achieved at 500 K, thus making MgScH 8 a potential hydrogen storage material.

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Hydrogen storage properties of nano-structured 0.65MgH2/0.35ScH2

Cited by 24 publications

References 29 publications

Nanostructured Metal Hydrides for Hydrogen Storage

Nanostructured Metal Hydrides for Hydrogen Storage

Magnesium based materials for hydrogen based energy storage: Past, present and future

Structures and Electronic and Hydrogen Storage Properties of Magnesium Scandium Hydrides

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