Thermodynamics of Metal Hydrides: Tailoring Reaction Enthalpies of Hydrogen Storage Materials

Dornheim, Martin

doi:10.5772/21662

Cited by 59 publications

(71 citation statements)

References 89 publications

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“…Mg 2 NiH 4 was synthesized by ball milling (BM) MgH 2 and Ni in a molar ratio 2:1. Approximately 5 g of powder were milled in a planetary Fritsch Pulverisette 6 mill for 10 h at 350 r.p.m.…”

Section: Methodsmentioning

confidence: 99%

“…Low cost and light weight hydrides are promising materials for solid-state hydrogen storage, owing to their high gravimetric and volumetric hydrogen capacity [1]. The theoretical hydrogen content of LiBH 4 is 18.5% wt, i.e., the highest among metal borohydrides, while it is equal to 10.7% wt for NaBH 4 , 7.5% wt for KBH 4 , 14.9% wt for Mg(BH 4 ) 2 and 11.6% wt for Ca(BH 4 ) 2 . Observed values are usually lower, depending on the experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In order to reduce their thermodynamic stabilities, transition metals have been added to form complex metal hydrides [2], such as in the case of MgH 2 mixed with Ni to form Mg 2 NiH 4 , with a theoretical hydrogen content equal to 3.6% wt. This complex metal hydride, upon heating, shows a polymorphic transition from a monoclinic to a cubic structure at 244 • C, together with the release of one hydrogen to form Mg 2 NiH 3 [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Reactive Hydride Composite of Mg2NiH4 with Borohydrides Eutectic Mixtures

et al. 2018

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Abstract:The development of materials showing hydrogen sorption reactions close to room temperature and ambient pressure will promote the use of hydrogen as energy carrier for mobile and stationary large-scale applications. In the present study, in order to reduce the thermodynamic stability of MgH 2 , Ni has been added to form Mg 2 NiH 4 , which has been mixed with various borohydrides to further tune hydrogen release reactions. De-hydrogenation/re-hydrogenation properties of Mg 2 NiH 4 -LiBH 4 -M(BH 4 ) x (M = Na, K, Mg, Ca) systems have been investigated. Mixtures of borohydrides have been selected to form eutectics, which provide a liquid phase at low temperatures, from 110 • C up to 216 • C. The presence of a liquid borohydride phase decreases the temperature of hydrogen release of Mg 2 NiH 4 but only slight differences have been detected by changing the borohydrides in the eutectic mixture.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reactive Hydride Composite of Mg2NiH4 with Borohydrides Eutectic Mixtures

et al. 2018

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“…Hydrogen holds enormous potential to be the ultimate energy carrier of the future [1][2][3][4][5]. Yet the lack of an effective method for storing hydrogen with high density currently restrains its widespread utilization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of LiAlH4 Nanoparticles Leading to a Single Hydrogen Release Step upon Ti Coating

Wang

Aguey‐Zinsou

2017

Inorganics

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Lithium aluminum hydride (LiAlH 4 ) is an interesting high capacity hydrogen storage material with fast hydrogen release kinetics when mechanically activated with additives. Herein, we report on a novel approach to produce nanoscale LiAlH 4 via a bottom-up synthesis. Upon further coating of these nanoparticles with Ti, the composite nanomaterial was found to decompose at 120 • C in one single and extremely sharp exothermic event with instant hydrogen release. This finding implies a significant thermodynamic alteration of the hydrogen properties of LiAlH 4 induced by the synergetic effects of the Ti catalytic coating and nanosizing effects. Ultimately, the decomposition path of LiAlH 4 was changed to LiAlH 4 → Al + LiH + 3/2H 2 .

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“…Among other chemical fuels, hydrogen offers the highest energy density per unit of weight. [1] In addition, it does not pollute because when it is produced by renewable energy (e.g. solar), stored in a medium and burned in a fuel cell, only water vapor is produced as waste.…”

Section: Introductionmentioning

confidence: 99%