The effect of sequential and continuous high-energy impact mode on the mechano-chemical synthesis of nanostructured complex hydride Mg2FeH6

Varin, R.A.; Li, S.; Wronski, Zbigniew S.; Morozova, O. S.; Khomenko, T. I.

doi:10.1016/j.jallcom.2004.08.048

Cited by 67 publications

(69 citation statements)

References 14 publications

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“…The synthesis of Mg 2 FeH 6 by ball milling has been studied by several authors using different milling parameters, such as: type of mill; ball to powder ratio; number and size of balls; milling time; rotational speed; milling atmosphere and hydrogen pressure [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Irrespective of the milling conditions, some iron was always detected in the milled powder representing an incomplete Mg 2 FeH 6 formation.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Effect of Milling Atmosphere and Starting Composition on Mg2FeH6 Formation

Asselli

Huot

2014

Metals

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Abstract:In this study we investigated the synthesis and the hydrogen storage properties of Mg 2 FeH 6 . The complex hydride was prepared by ball milling under argon and hydrogen atmosphere from 2Mg + Fe and 2MgH 2 + Fe compositions. The samples were characterized by X-ray powder diffraction and scanning electron microcopy. Kinetics of hydrogen absorption and desorption were measured in a Sievert's apparatus. We found that the milling atmosphere plays a more important role on Mg 2 FeH 6 synthesis than the starting compositions. Ball milling under hydrogen pressure resulted in smaller particles sizes and doubled the yield of Mg 2 FeH 6 formation. Despite the microstructural differences after ball milling, all samples had similar hydrogen absorption and desorption kinetics. Loss of capacity was observed after only five cycles of hydrogen absorption/desorption.

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Section: Introductionmentioning

confidence: 99%

Investigation of Effect of Milling Atmosphere and Starting Composition on Mg2FeH6 Formation

Asselli

Huot

2014

Metals

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“…These complex hydrides were initially fabricated by sintering at moderate temperatures (500 • C) and high H 2 pressures (6 MPa) [3]. Afterwards, mechanical milling proved to be an efficient method to synthesize these compounds, with yields comparable or better than those obtained by conventional methods [4,5]. In turn, transition metals, when added in small quantities to Mg [6], may act as catalyzers to accelerate the hydrogen charge or discharge rate of metallic Mg.…”

Section: Introductionmentioning

confidence: 99%

The role of Fe during hydride formation in the Mg–Fe system: a Mössbauer investigation

2007

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The mechanically assisted hydriding of Mg 1−x Fe x powder mixtures with x = 0.02, 0.03, 0.10, 0.20 and 0.33 was studied. The hydriding kinetics up to saturation was followed from the hydrogen absorption during milling. All the steady state samples and some partially hydrided ones, with x = 0.03, were characterized by X-ray diffraction and Mössbauer spectroscopy. The catalytic action of Fe in the H 2 sorption by Mg based systems and the influence of complex ternary hydride formation in such processes are discussed.

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“…A typical shape for this type of peaks is rather symmetrical, as for example, reported in [2,26]. Varin et al [27] pointed out that a narrow hydrogen TPD peak indicates the presence of small well-crystallized hydride particles. The asymmetry of the TPD peak in the present case might be related to the catalytic effect of Fe particles embedded into the Mg matrix and the grain size distribution for the Mg matrix which is skewed towards very small nanocrystalline grains.…”

Section: Elemental Nanometric Metal Catalystsmentioning

confidence: 62%

A Review of Recent Advances on the Effects of Microstructural Refinement and Nano-Catalytic Additives on the Hydrogen Storage Properties of Metal and Complex Hydrides

et al. 2010

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Abstract:The recent advances on the effects of microstructural refinement and various nano-catalytic additives on the hydrogen storage properties of metal and complex hydrides obtained in the last few years in the allied laboratories at the University of Waterloo (Canada) and Military University of Technology (Warsaw, Poland) are critically reviewed in this paper. The research results indicate that microstructural refinement (particle and grain size) induced by ball milling influences quite modestly the hydrogen storage properties of simple metal and complex metal hydrides. On the other hand, the addition of nanometric elemental metals acting as potent catalysts and/or metal halide catalytic precursors brings about profound improvements in the hydrogen absorption/desorption kinetics for simple metal and complex metal hydrides alike. In general, catalytic precursors react with the hydride matrix forming a metal salt and free nanometric or amorphous elemental metals/intermetallics which, in turn, act catalytically. However, these catalysts change only kinetic properties i.e. the hydrogen absorption/desorption rate but they do not change thermodynamics (e.g., enthalpy change of hydrogen sorption reactions). It is shown that a complex metal hydride, LiAlH 4 , after high energy ball milling with a nanometric Ni metal catalyst and/or MnCl 2 catalytic precursor, is able to desorb relatively large quantities of hydrogen at RT, 40 and 80 °C . This kind of behavior is very encouraging for the future development of solid state hydrogen systems. OPEN ACCESSEnergies 2011, 4 2 Keywords: solid state hydrogen storage; ball milling; microstructural refinement; particle/grain size; nano-catalytic additives; simple metal and complex hydrides

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The effect of sequential and continuous high-energy impact mode on the mechano-chemical synthesis of nanostructured complex hydride Mg2FeH6

Cited by 67 publications

References 14 publications

Investigation of Effect of Milling Atmosphere and Starting Composition on Mg2FeH6 Formation

Investigation of Effect of Milling Atmosphere and Starting Composition on Mg2FeH6 Formation

The role of Fe during hydride formation in the Mg–Fe system: a Mössbauer investigation

A Review of Recent Advances on the Effects of Microstructural Refinement and Nano-Catalytic Additives on the Hydrogen Storage Properties of Metal and Complex Hydrides

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