Using MgO to improve the (de)hydriding properties of magnesium

Aguey-Zinsou, Kondo Francois; Ares, J.R.; Klassen, Thomas; Bormann, R.

doi:10.1016/j.materresbull.2005.11.011

Cited by 131 publications

(65 citation statements)

References 41 publications

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“…However, a significant decrease of the hydrogen desorption temperature was obtained when MgH 2 was milled with MgO as the desorption peak shifted from 336 C to 262 C. In our previous report, such a drastic improvement of hydrogen desorption was related to an important reduction in the size of MgH 2 particles as MgO would act as a process control agent facilitating the grinding of MgH 2 particles [32]. Further investigations on the potential effect of MgO have raised the possibility of a defective oxide layer at the surface of MgH 2 particles catalysing the splitting/recombination of hydrogen [37].…”

Section: Oxidation Effect On Hydrogen Desorptionmentioning

confidence: 85%

“…As MgH 2 particles are initially fractured, the generation of fresh surfaces would result in an excess of surface energy leading to particles agglomeration and cold welding upon balls impact. Hence depending on the experimental conditions, the milling process would become quickly inefficient in reducing particle sizes when the equilibrium between cold-welding and fracturing is established [32,44]. To delay this equilibrium and reach the smallest possible particle size, process control agents such as polar, non-polar organic solvents or polymers maintaining a low friction are usually employed to reduce agglomeration and cold-welding [46].…”

Section: Rationalisation Of the Effect Of Oxidesmentioning

confidence: 99%

“…By simply adding a diamond powder or MgO during mechanical milling to MgH 2 , it was possible to achieve hydrogen kinetics similar to those observed upon transition metal additions [32,33]. In this case, the improvement of hydrogen kinetics cannot be explained by the formation of new active phases, catalytic or chemical effects.…”

Section: Introductionmentioning

confidence: 97%

“…These results opened new pathways and models toward the use of non-transition metals as effective promoters of hydrogen kinetics in magnesium. We proposed a new hypothesis whereby MgO would act as a dispersive agent during mechanical milling leading to an efficient particle size reduction and stabilisation and therefore enhanced hydrogen kinetics due to small diffusion paths [32]. However, similarities of the hydrogen kinetic curves obtained with transition metal oxides and MgO point toward more correlation between the effects of these oxides at the macroscopic level.…”

Section: Introductionmentioning

confidence: 99%

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Superior MgH2 Kinetics with MgO Addition: A Tribological Effect

Ares-Fernández

Aguey‐Zinsou

2012

Catalysts

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Abstract:The kinetics of hydrogen absorption/desorption in magnesium can be improved without any catalysis assistance and MgO was found to be more effective than the best catalyst reported so far, i.e., Nb 2 O 5 . Herein, a quantitative analysis of the hydrogen kinetics in magnesium modified with MgO was performed in order to identify possible rate controlling mechanisms. While hydrogen absorption was found to be diffusion controlled as commonly reported, hydrogen desorption evolved from nucleation and growth to an interface controlled process depending on the desorption temperature. Comparison with the effect of Nb 2 O 5 indicates that similar rate limiting steps occur regardless of the oxide additive. These findings are reconciled by considering the tribological effect of solid oxide additives, as a correlation between oxides electronegativity and improvement in hydrogen kinetics was found. Such a correlation clearly highlights the mechanical effect of solid oxides in facilitating the grinding and stabilisation of small magnesium particles for efficient and fast hydrogen kinetics.

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Section: Oxidation Effect On Hydrogen Desorptionmentioning

confidence: 85%

Section: Rationalisation Of the Effect Of Oxidesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Superior MgH2 Kinetics with MgO Addition: A Tribological Effect

Ares-Fernández

Aguey‐Zinsou

2012

Catalysts

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“…This aspect has been clearly elucidated by Aguey-Zinsou et al [17] who showed that finely pulverized MgH 2 shows fast decomposition kinetics.…”

Section: Introductionmentioning

confidence: 84%

Hydrogen Release and Microstructure of MgH₂Based Composite Powders Containing a Relevant Amount of LaNi₅

et al. 2010

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Micro-composite materials based on MgH 2 with the addition of a relevant amount of LaNi 5 have been synthesized by reactive ball milling. The powder microstructure has been studied by a combination of X-ray diffraction and scanning electron microscopy, while the decomposition behaviour and the hydrogen release properties have been obtained by differential thermal analysis and thermo-gravimetric measurements. Both temperature scans and constant temperature isotherms have been used to this purpose. Experimental results allow identifying optimum processing condition for synthesis of material that shows the onset of hydrogen release at temperatures as low as 450 K. The decomposition kinetics has been studied by isothermal measurements which show that the whole process cannot be described by just one mechanism limiting the reaction velocity. In fact in the first decomposition step the reaction is kinetically limited by the second phase nucleation, while, for partially decomposed samples the bulk diffusion appears to limit the process. On the basis of the experimental results we propose a mechanism of phase transformation where a percolating network of the two phases is formed.

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Tailoring Hydrogen Storage Materials Towards Application

Dornheim¹,

Eigen²,

et al. 2006

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A breakthrough in hydrogen storage technology was achieved by preparing nanocrystalline hydrides using high‐energy ball milling and the use of suitable catalysts/additives. These new materials show fast or in case of Mg‐based hydrides very fast absorption and desorption kinetics within minutes, thus qualifying lightweight Mg‐ or Al‐based hydrides for storage applications. This article summarizes our current understanding of the kinetics of Mg‐based light metal hydrides, describes an approach for a cost‐effective processing technology and highlights some promising new developments in lightweight metal hydride research.

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Using MgO to improve the (de)hydriding properties of magnesium

Cited by 131 publications

References 41 publications

Superior MgH2 Kinetics with MgO Addition: A Tribological Effect

Superior MgH2 Kinetics with MgO Addition: A Tribological Effect

Hydrogen Release and Microstructure of MgH₂Based Composite Powders Containing a Relevant Amount of LaNi₅

Tailoring Hydrogen Storage Materials Towards Application

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Using MgO to improve the (de)hydriding properties of magnesium

Cited by 131 publications

References 41 publications

Superior MgH2 Kinetics with MgO Addition: A Tribological Effect

Superior MgH2 Kinetics with MgO Addition: A Tribological Effect

Hydrogen Release and Microstructure of MgH2Based Composite Powders Containing a Relevant Amount of LaNi5

Tailoring Hydrogen Storage Materials Towards Application

Contact Info

Product

Resources

About

Hydrogen Release and Microstructure of MgH₂Based Composite Powders Containing a Relevant Amount of LaNi₅