Formation and crystal growth process of AlH3 in Al–H system

Saitoh, Hiroyuki; Okajima, Yuka; Yoneda, Yasuhiro; Machida, Akihiko; Kawana, Daichi; Watanuki, Tetsu; Katayama, Yoshinori; Aoki, Katsutoshi

doi:10.1016/j.jallcom.2010.02.112

Cited by 25 publications

(10 citation statements)

References 14 publications

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“…Saitoh et al [ 44 ] studied the reaction process of aluminum and hydrogen at 10 GPa and 600 °C by in situ X-ray diffraction. As shown in Figure 5 , the X-ray diffraction images of the samples are collected every 10 min during the hydrogenation process [ 44 ]. The yellow and red particles represent Al and AlH 3 particles, respectively.…”

Section: Synthesis Methodsmentioning

confidence: 99%

“…The yellow and red particles represent Al and AlH 3 particles, respectively. Saitoh et al found that the growth process of AlH 3 single crystal will go through three stages: self-pulverization of aluminum (with the increase of reaction time, it is found that the size of aluminum Bragg lattice decreases), hydrogenation of pulverized aluminum (X-ray diffraction image shows a new Bragg lattice), and solid-state grain growth of AlH 3 [ 44 ].…”

Section: Synthesis Methodsmentioning

confidence: 99%

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Synthesis and Stability of Hydrogen Storage Material Aluminum Hydride

Zhao

et al. 2021

Materials

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Aluminum hydride (AlH3) is a binary metal hydride with a mass hydrogen density of more than 10% and bulk hydrogen density of 148 kg H2/m3. Pure aluminum hydride can easily release hydrogen when heated. Due to the high hydrogen density and low decomposition temperature, aluminum hydride has become one of the most promising hydrogen storage media for wide applications, including fuel cell, reducing agents, and rocket fuel additive. Compared with aluminum powder, AlH3 has a higher energy density, which can significantly reduce the ignition temperature and produce H2 fuel in the combustion process, thus reducing the relative mass of combustion products. In this paper, the research progress about the structure, synthesis, and stability of aluminum hydride in recent decades is reviewed. We also put forward the challenges for application of AlH3 and outlook the possible opportunity for AlH3 in the future.

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Section: Synthesis Methodsmentioning

confidence: 99%

Section: Synthesis Methodsmentioning

confidence: 99%

Synthesis and Stability of Hydrogen Storage Material Aluminum Hydride

Zhao

et al. 2021

Materials

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“…9) This system revealed the self-pulverization of aluminum prior to hydrogenation and the subsequent solid-state grain growth of AlH 3 . Pulverization of metal hydrides is commonly observed during hydrogenation-dehydrogenation cyclic reactions and thought to be caused by internal strain introduced by large volume change associated with the reactions.…”

Section: Introductionmentioning

confidence: 93%

<I>In Situ</I> X-ray Diffraction Measurements of Aluminum Pulverization prior to the Hydrogenation Reaction

et al. 2011

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The hydrogenation process of aluminum, especially pulverization of aluminum prior to the hydrogenation reaction was investigated by in situ synchrotron radiation X-ray diffraction measurements at high pressure and high temperature. Changes in the crystal grain sizes during the hydrogenation process were observed using the angle dispersive method, while weak Bragg peaks from aluminum and AlH 3 with small X-ray scattering factors were detected using focused monochromatic X-rays as the incident beam. The in situ measurement system monitored the pulverization of aluminum at several pressure-temperature conditions where AlH 3 was thermodynamically stable.

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“…6,7) The hydrogenation process of aluminum and the crystal growth process of formed AlH 3 have previously been investigated by in situ synchrotron radiation X-ray diffraction measurement at high pressures and high temperatures. 8) It has been clarified that aluminum is hydrogenated to form AlH 3 and the formed AlH 3 particles grow into single crystals via solid-state grain growth. Single crystals of AlH 3 with a lateral size of about 20 µm are thus formed.…”

Section: )mentioning

confidence: 99%

Hydrogenation of Anodized Aluminum and Crystal Growth of Formed Hydride at High Pressure and High Temperature

Saitoh

Kato²,

Katagiri

2014

Mater. Trans.

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Anodized aluminum samples with different surface oxide layer thicknesses (approximately 0.3 and 3 µm) were hydrogenated at 9 GPa and 600°C for 24 h. A few large crystals of AlH 3 , of which average crystal size was 30 µm, were formed when the aluminum sample with the thicker oxide layer was hydrogenated, whereas the sample with the thinner oxide layer was uniformly hydrogenated to form AlH 3 crystals 10 µm in particle size. It is likely that the surface oxide layer inhibits not only the hydrogenation reaction of aluminum but also the spontaneous nucleation of AlH 3 , which causes the difference between the formed crystal sizes.

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Formation and crystal growth process of AlH3 in Al–H system

Cited by 25 publications

References 14 publications

Synthesis and Stability of Hydrogen Storage Material Aluminum Hydride

Synthesis and Stability of Hydrogen Storage Material Aluminum Hydride

<I>In Situ</I> X-ray Diffraction Measurements of Aluminum Pulverization prior to the Hydrogenation Reaction

Hydrogenation of Anodized Aluminum and Crystal Growth of Formed Hydride at High Pressure and High Temperature

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