Hydrogen interaction with mechanically alloyed magnesium–salt composite materials

Ivanov, E.; Konstanchuk, I.; Bokhonov, Boris B.; Болдырев, В. В.

doi:10.1016/s0925-8388(03)00297-4

Cited by 47 publications

(17 citation statements)

References 24 publications

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“…That is KCl acts as a process control agent that impedes clean Mg-to-Mg contacts necessary for cold welding and thus, the powder fracturing is promoted. This effect was also observed by Ivanov et al [19] with var- The formation of smaller Mg particles when milled with KCl is confirmed by SEM observations (Fig. 2).…”

Section: Methodssupporting

confidence: 84%

Hydrolysis of Mg–salt and MgH2–salt mixtures prepared by ball milling for hydrogen production

Grosjean

Roué

2006

Journal of Alloys and Compounds

124

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Section: Methodssupporting

confidence: 84%

Hydrolysis of Mg–salt and MgH2–salt mixtures prepared by ball milling for hydrogen production

Grosjean

Roué

2006

Journal of Alloys and Compounds

124

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“…Ivanov et al [10] reported that addition of 5 wt % MgF 2 to pure Mg during milling leads to 5 wt % hydrogen absorption in over 20 h but has an insignificant effect on dehydrogenation kinetics of MgH 2 . Loss in absorption capacity from the second cycle onwards was also observed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnesium Fluoride on Hydrogenation Properties of Magnesium Hydride

et al. 2015

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Abstract:A cost effective catalyst is of great importance for consideration of MgH 2 as potential hydrogen storage material. In this regard, we investigated the catalytic role of alkaline metal fluoride on the hydrogen storage behavior of MgH 2 . Samples were synthesized by admixing 5 mol % MgF 2 into MgH 2 powder using planetary ball mill. Hydrogenation measurements made at 335˝C showed that in comparison to only 70% absorption by pure MgH 2 , catalyzed material absorbed 92% of theoretical capacity in less than 20 min and desorbed completely in almost the same time. Sorption studies done at lower temperatures revealed that complete absorption at temperature as low as 145˝C is possible. This is due to uniform distribution of MgF 2 nano particles within the MgH 2 powder. X-ray diffraction patterns also showed the presence of stable MgF 2 phase that does not decompose upon hydrogen absorption-desorption. Cyclic measurements done at 310˝C showed negligible loss in the overall storage capacity with cycling. These results reveal that the presence of the chemically inert and stable MgF 2 phase is responsible for good reversible characteristic and improved kinetics.

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“…Moreover, halides of Fe, Ni, and Nb have also shown attractive catalytic properties (Ivanov et al, 2003;Deledda et al, 2005;Bhat et al, 2006;Kim et al, 2008;Ma et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Mechanism and kinetics of early transition metal hydrides, oxides, and chlorides to enhance hydrogen release and uptake properties of MgH₂

2015

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Selected hydrides (TiH 2 , ZrH 2 ), chlorides (VCl 3 , ScCl 3 ) or oxides (V 2 O 5 ) utilized as additives facilitating hydrogen release and uptake for magnesium hydride were investigated using mechanochemical treatment and in-situ synchrotron radiation powder X-ray diffraction studies. The fastest hydrogen desorption and absorption kinetics for MgH 2 was observed for a sample with 5 mol% V 2 O 5 at 320°C. Additional activation of the system (2 cycles, vacuum/p(H 2 ) ∼150 bar, 450°C) leads to significant improvement of the kinetics even at lower temperatures, 270°C. The observed prolific effect is achieved through the full reduction of vanadium oxides and formation of an efficient vanadium catalyst as nanoparticles and possibly interfacial effects in the MgO/Mg/MgH 2 /V system introduced during cycling hydrogen release and uptake in hydrogen/dynamic vacuum at 450°C. Nanostructuring as well as hydrogen permeability via vanadium nanoparticles may improve kinetics and reduce the apparent activation energy for hydrogen release. Thus, the enhancement of hydrogen release/uptake in the MgH 2 owe to "in situ" formation of vanadium nanoparticles by reduction of V 2 O 5 .

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Hydrogen interaction with mechanically alloyed magnesium–salt composite materials

Cited by 47 publications

References 24 publications

Hydrolysis of Mg–salt and MgH2–salt mixtures prepared by ball milling for hydrogen production

Hydrolysis of Mg–salt and MgH2–salt mixtures prepared by ball milling for hydrogen production

Effect of Magnesium Fluoride on Hydrogenation Properties of Magnesium Hydride

Mechanism and kinetics of early transition metal hydrides, oxides, and chlorides to enhance hydrogen release and uptake properties of MgH₂

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Hydrogen interaction with mechanically alloyed magnesium–salt composite materials

Cited by 47 publications

References 24 publications

Hydrolysis of Mg–salt and MgH2–salt mixtures prepared by ball milling for hydrogen production

Hydrolysis of Mg–salt and MgH2–salt mixtures prepared by ball milling for hydrogen production

Effect of Magnesium Fluoride on Hydrogenation Properties of Magnesium Hydride

Mechanism and kinetics of early transition metal hydrides, oxides, and chlorides to enhance hydrogen release and uptake properties of MgH2

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Mechanism and kinetics of early transition metal hydrides, oxides, and chlorides to enhance hydrogen release and uptake properties of MgH₂