A study of the ZrF4, NbF5, TaF5, and TiCl3 influences on the MgH2 sorption properties

Malka, Iwona; Pisarek, Marcin; Czujko, Tomasz; Bystrzycki, J.

doi:10.1016/j.ijhydene.2011.07.020

Cited by 126 publications

(63 citation statements)

References 26 publications

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“…In addition, the transition metal fluoride is very sensitive to atmospheric conditions. Ball milled MgH 2 + TM-fluoride samples require oxygen and moisture level to be less than 0.1 ppm for obtaining good hydrogenation results [7,9,11,15].…”

Section: Discussionmentioning

confidence: 99%

“…Later, it was found that some transition metal halides, such as FeF 3 , CrCl 3 , NiF 2 , NbCl 5 and TiCl 3 possess better catalytic activity than pure metals or their oxides [6][7][8]. In the case of halides, Malka et al [9] showed that fluorides are better catalysts than chlorides for MgH 2 . Addition of transition metal fluorides during milling helps to lower the hydrogen release temperature and increase the rate of hydrogen uptake by MgH 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Addition of transition metal fluorides during milling helps to lower the hydrogen release temperature and increase the rate of hydrogen uptake by MgH 2 . It has been shown by different groups [7][8][9] that during milling of MgH 2 with transition metal fluorides, the formed MgF 2 phase replaces the original oxide layer and provides a reactive and protective fluorinated surface for hydrogen uptake. This compound possesses high affinity with hydrogen because of the F-anion, which weakens the Mg-H bonding and improves the sorption properties [9].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Magnesium Fluoride on Hydrogenation Properties of Magnesium Hydride

et al. 2015

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“…Catalyst doping with various types of metal halides, such as ZrF 4 , TaF 5 , NbF 5 , TiF 3 , FeF 2 and TiCl 3 , had positive effects on the sorption kinetics of light metal hydrides and complex hydrides [58,180,181]. Various metal chlorides were also investigated as catalysts for the hydrogen desorption and regeneration reaction of the ammonia and lithium hydride (NH 3 eLiH) system.…”

Section: Metal Halidesmentioning

confidence: 99%

The kinetics of lightweight solid-state hydrogen storage materials: A review

Khafidz

Yaakob

Lim

et al. 2016

International Journal of Hydrogen Energy

124

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“…Among them, reducing particle size by high-energy mechanical milling [12][13] and compositing MgH 2 with additives such as transition metals [14][15], metal oxides [16][17], metal halides [18][19], and rare-earth metals [20][21] have been reported to be two important methods. The hydriding/dehydriding characteristics of MgH 2 were improved dramatically after ball milling with Ti, Fe, and Ni, which was ascribed to the co-catalysis of these three metals [22][23].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen storage properties of MgH2 co-catalyzed by LaH3 and NbH

Song

Zhao

et al. 2017

Int J Miner Metall Mater

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Abstract:To improve the hydrogen storage properties of Mg-based alloys, a composite material of MgH 2 + 10wt%LaH 3 + 10wt%NbH was prepared by a mechanical milling method. The composite exhibited favorable hydrogen desorption properties, releasing 0.67wt% H 2 within 20 min at 548 K, which was ascribed to the co-catalytic effect of LaH 3 and NbH upon dehydriding of MgH 2 . By contrast, pure MgH 2 , an MgH 2 + 20wt%LaH 3 composite, and an MgH 2 + 20wt%NbH composite only released 0.1wt%, 0.28wt%, and 0.57wt% H 2 , respectively, under the same conditions. Analyses by X-ray diffraction and scanning electron microscopy showed that the composite particle size was small. Energy-dispersive X-ray spectroscopic mapping demonstrated that La and Nb were distributed homogeneously in the matrix. Differential thermal analysis revealed that the dehydriding peak temperature of the MgH 2 + 10wt%LaH 3 + 10wt%NbH composite was 595.03 K, which was 94.26 K lower than that of pure MgH 2 . The introduction of LaH 3 and NbH was beneficial to the hydrogen storage performance of MgH 2 .

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A study of the ZrF4, NbF5, TaF5, and TiCl3 influences on the MgH2 sorption properties

Cited by 126 publications

References 26 publications

Effect of Magnesium Fluoride on Hydrogenation Properties of Magnesium Hydride

Effect of Magnesium Fluoride on Hydrogenation Properties of Magnesium Hydride

The kinetics of lightweight solid-state hydrogen storage materials: A review

Hydrogen storage properties of MgH2 co-catalyzed by LaH3 and NbH

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