The development, testing and optimization of energy storage materials based on the MgH2Mg system

Bogdanović, Borislav; Hartwig, Thoralf; Spliethoff, Bernd

doi:10.1016/0360-3199(93)90178-d

Cited by 127 publications

(71 citation statements)

References 11 publications

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“…Moreover, in contrast to some intermetallic compounds, which show significant degradation against cycling [2], the binary metal hydride systems exhibit good resistance against repeated desorption-absorption phase transformations [3,4]. On the other hand, these sorption reactions are quite slow so that high temperatures are required for fast hydrogen absorption and release.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Kinetic Evolution of Fe Doped MgH2 during H2 Cycling

et al. 2012

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The effect of extended H 2 sorption cycles on the structure and on the hydrogen storage performances of MgH 2 powders with 5 wt% of Fe particle catalyst is reported. MgH 2 powders with and without Fe have been ball milled under Argon, the doped MgH 2 nanocomposite has been cycled under hydrogen pressure up to a maximum of 47 desorption and absorption cycles at 300 °C. After acceleration during the first 10 cycles, the kinetics behavior of doped MgH 2 is constant after extended cycling, in terms of maximum storage capacity and rate of sorption. The major effect of cycling on particle morphology is the progressive extraction of Mg from the MgO shell surrounding the powder particles. The Mg extraction from the MgO shell leaves the catalyst particles inside the hydride particles. Many empty MgO shells are observed in the pure ball milled MgH 2 upon cycling at higher temperature, suggesting that this enhancement of the extraction efficiency is related to the higher operating temperature which favors Mg diffusivity with respect to the H ion one.

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Section: Introductionmentioning

confidence: 99%

Microstructural and Kinetic Evolution of Fe Doped MgH2 during H2 Cycling

et al. 2012

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“…to MgH 2 has successfully reduced the time taken to absorb or desorb hydrogen [16][17][18][19][20][21][22]. Recently, carbon nanomaterials have been investigated as catalytic materials for enhancing the uptake and release of hydrogen from MgH 2 due to its lightweight nature.…”

Section: Introductionmentioning

confidence: 99%

The Improvement of Dehydriding the Kinetics of NaMgH3 Hydride via Doping with Carbon Nanomaterials

Wang

Song

et al. 2016

Metals

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NaMgH 3 perovskite hydride and NaMgH 3 -carbon nanomaterials (NH-CM) composites were prepared via the reactive ball-milling method. To investigate the catalytic effect of CM on the dehydriding kinetic properties of NaMgH 3 hydride, multiwall carbon nanotubes (MWCNTs) and graphene oxide (GO) were used as catalytic additives. It was found that dehydriding temperatures and activation energies (∆E 1 and ∆E 2 ) for two dehydrogenation steps of NaMgH 3 hydride can be greatly reduced with a 5 wt. % CM addition. The NH-2.5M-2.5G composite presents better dehydriding kinetics, a lower dehydriding temperature, and a higher hydrogen-desorbed amount (3.64 wt. %, 638 K). ∆E 1 and ∆E 2 can be reduced by about 67 kJ/mol and 30 kJ/mol, respectively. The results suggest that the combination of MWCNTs and GO is a better catalyst as compared to MWCNTs or GO alone.

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“…However, the hydrogen absorption-desorption kinetics are low and need high temperature (from 300ºC to 400ºC) due to the large formation enthalpy of the Mg hydride and diffusion properties. Possible ways to improve the hydrogen absorption-desorption kinetics are alloying Mg to modify the crystal structure of the hydrides by addition of transition metals, metal oxides or rare earths [7][8][9][10][11][12][13][14][15] , reducing the grain size by alloying elements, mechanical deformation or rapid solidification. In recent years the absorption-desorption of hydrogen in Mg alloys produced by unconventional methods have been investigated [16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Alloying Elements in Melt Spun Mg-alloys for Hydrogen Storage

et al. 2016

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In this paper we report the effect of alloying elements on hydrogen storage properties of meltspun Mg-based alloys. The base alloys Mg 90 Si 10 , Mg 90 Cu 10 , Mg 65 Cu 35 (at%) were studied. We also investigated the effect of rare earths (using MM: mischmetal) alloys showed an amorphous and partially amorphous structure respectively. At 350˚C all the alloys had a crystalline structure during the hydrogen absorption-desorption tests. It was observed that Si and Cu in the binaries alloys hindered completely the activation of the hydrogen absorption. The partial substitution of Cu by MM or Al allowed activation. The combined substitution of Cu by MM and Al showed the best results with the fastest absorption and desorption kinetics, which suggests that this combination can be used for new Mg-alloys to improve hydrogen storage properties.

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The development, testing and optimization of energy storage materials based on the MgH2Mg system

Cited by 127 publications

References 11 publications

Microstructural and Kinetic Evolution of Fe Doped MgH2 during H2 Cycling

Microstructural and Kinetic Evolution of Fe Doped MgH2 during H2 Cycling

The Improvement of Dehydriding the Kinetics of NaMgH3 Hydride via Doping with Carbon Nanomaterials

Effect of Alloying Elements in Melt Spun Mg-alloys for Hydrogen Storage

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