Kinetics of interaction of Mg-based mechanically activated alloys with hydrogen

Mushnikov, N. V.; Ермаков, А. Е.; Уймин, М. А.; Гавико, В. С.; Терентьев, П. Б.; Skripov, A. V.; Tankeev, A. P.; Soloninin, Alexei V.; Buzlukov, A. L.

doi:10.1134/s0031918x06100097

Cited by 44 publications

(26 citation statements)

References 29 publications

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“…Magnesium hydride (MgH 2 ) has been an attractive contender for hydrogen storage due to its high hydrogen content (7.6 wt%). It can be formed directly through the reaction of magnesium with hydrogen under mild conditions thermodynamically (<1 bar and~50 • C), however, the sluggish kinetics allow the hydrogenation to occur only at 350-400 • C and high pressure, i.e., 3 MPa [29][30][31]. There are several factors which affect the kinetics of magnesium hydride formation, including the surface oxidation [32], low dissociation rate of H 2 molecules on metal surface [33], and slow diffusion of dissociated H 2 atoms within the hydride [34].…”

Section: Catalysts For Mghmentioning

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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Section: Catalysts For Mghmentioning

confidence: 99%

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

2018

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“…MBMs usually show poor sorption kinetics. A temperature over 350 °C and a hydrogen pressure over 3 MPa are required for hydrogen absorption . It also normally takes hours for the hydrogen absorption reaction to reach completion.…”

Section: Technical Requirements For Hydrogen‐storage Materialsmentioning

confidence: 99%

“…Forl arge-scale heat storage or renewable-energy storage,t he kinetics of hydrogen-storage materials impacts on the ability to store peak power of heat or renewable energya nd the ability to supply power during the utilizationo ft he stored energy.M BMs usuallys how poor sorption kinetics.Atemperature over 350 8Ca nd ah ydrogen pressureo ver 3MPa are required for hydrogen absorption. [24] It also normally takes hours for the hydrogen absorption reaction to reach completion. This is mainly because the magnesium oxide layer on the surface of magnesium particles greatly prevents the contactofmagnesium with hydrogen and hampershydrogen penetrationi nto the particles to form magnesium hydride andh ydrogen diffusion is slow in the large particles.…”

Section: Absorption and Desorption Kineticsmentioning

confidence: 99%

Progress and Trends in Magnesium‐Based Materials for Energy‐Storage Research: A Review

Shao¹,

Lin

et al. 2017

Energy Tech

157

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For the realization of a hydrogen economy, one enabling technology is hydrogen storage. Magnesium‐based materials (MBMs) are very promising candidates for hydrogen storage due to the large hydrogen capacity and low cost. Challenges in the development of magnesium‐based hydrogen‐storage materials for various applications, particularly for onboard storage, are poor kinetics and unsuitable thermodynamics. Herein, new methods and techniques adopted by the researchers in this field are reviewed, with a focus on how different techniques could affect the hydrogen‐storage properties of MBMs, including kinetics and thermodynamics. Based on current progress, research trends in MBMs for various applications are introduced. Classical work from some pioneers, important milestones, and the latest development for these possible applications are summarized and future prospects in these fields are discussed.

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“…The increase in the hydrogenation rate of the alloys resulting from the mechanical activation is shown to be due to the formation of a specific structural state of the particle surface, which exhibits a high catalytic activity for the hydrogen sorption [3]. It has been found recently that ball milling of many metals under a hydrogen atmosphere promote rapid hydrogen absorption.…”

Section: Introductionmentioning

confidence: 98%

Hydrogenation Of The Titanium Aluminides

et al. 2008

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Titanium aluminides are very important materials for elevated temperature applications, especially by its low density. The low density of these materials is also very attractive for other purpose, for example for using of these intermetallics as hydrogen accumulators or storages. It is well known that a number of metals can absorb large quantities of hydrogen. In many cases a major difficulty is getting the hydrogen into the metal. Oxide layer of titanium aluminides, which is so useful for its elevated temperature applications, prevents its hydrogen absorption. In such cases it is customary to expose the metal to hydrogen at high temperature and elevated temperature for an extended period of time, for titanium aluminides the adsorption temperature is about 800C. But such high temperature is not possible for the hydrogen accumulator. It has been discovered that ball milling of many metals under a hydrogen atmosphere promote rapid hydrogen absorption. We studied the hydrogen absorption properties of the Ti-Al-Nb system intermetallics during ball milling. We defined that the hydrogenation of the titanium aluminides under ball milling in the hydrogen atmosphere could occur at the room temperature without any requirements on quality of hydrogen. The crystal structure of the hydrides and phase transformations were also studied.

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Kinetics of interaction of Mg-based mechanically activated alloys with hydrogen

Cited by 44 publications

References 29 publications

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

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

Progress and Trends in Magnesium‐Based Materials for Energy‐Storage Research: A Review

Hydrogenation Of The Titanium Aluminides

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