High-pressure synthesis of novel compounds in an Mg–Ni system

Kamegawa, Atsunori; Goto, Yasuyuki; Kataoka, Riki; Takamura, Hitoshi; Okada, Masuo

doi:10.1016/j.renene.2007.05.008

Cited by 49 publications

(19 citation statements)

References 24 publications

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“…The MgNi 2 alloy has been reported to be extremely stable and cannot form hydrides under conventional hydrogenation conditions. 39,40 It has also been reported by Li at el. 33 MgH 2 sample.…”

Section: Resultssupporting

confidence: 55%

Improved reversible dehydrogenation of 2LiBH₄+MgH₂ system by introducing Ni nanoparticles

Mao

Guo

et al. 2011

J. Mater. Res.

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We report that the hydrogen de/resorption of the 2LiBH 4 +MgH 2 system was modified by introducing Ni nanoparticles. Dehydrogenation analysis revealed that the first-step dehydrogenation, i.e., the decomposition of MgH 2 , can be significantly promoted by adding a small amount of Ni because of the catalytic effect. However, the improvement of the second-step dehydrogenation, corresponding to the decomposition of LiBH 4 , needs the addition of a large amount of Ni, resulting in the formation of a Mg-Ni-B ternary alloy. Furthermore, the presence of the Mg-Ni-B ternary alloy allowed an increased reversible H-capacity, in which about 5.3 wt% of hydrogen can be rehydrogenated under 400°C and 55 bar hydrogen pressure over 10 h, which is higher than that of the pristine 2LiBH 4 +MgH 2 system (4.4 wt%).

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Section: Resultssupporting

confidence: 55%

Improved reversible dehydrogenation of 2LiBH₄+MgH₂ system by introducing Ni nanoparticles

Mao

Guo

et al. 2011

J. Mater. Res.

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“…Hydrogenation of the sample at high pressure and high temperature was achieved by using a high-pressure cell developed by Fukai and Okuma, 19 which has been used in other high-pressure hydrogenation studies. 7,9,10,20,21 A NaCl capsule was used to seal hydrogen fluid that evolved from the powder mixture of NaBH 4 and Ca(OH) 2 around 400…”

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confidence: 99%

Li4FeH6: Iron-containing complex hydride with high gravimetric hydrogen density

et al. 2014

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Li4FeH6, which has the highest gravimetric hydrogen density of iron-containing complex hydrides reported so far, is synthesized by hydrogenation of a powder mixture of iron and LiH above 6.1 GPa at 900 °C. In situ synchrotron radiation X-ray diffraction measurements reveal that while kinetics require high temperature and thus high pressure for the synthesis, Li4FeH6 is expected to be thermodynamically stable slightly below room temperature at ambient pressure; further synthetic studies to suppress the kinetic effects may enable us to synthesize Li4FeH6 at moderate pressures. Li4FeH6 can be recovered at ambient conditions where Li4FeH6 is metastable.

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“…Figure 1 shows the highpressure cell assembly used in the present study, which was first reported by Fukai and Okuma 10) and has been used by other groups for high-pressure synthetic studies of metal hydrides. 11) Instead of pyrophyllite, a boron epoxy pressure medium was used because the complex diffraction patterns from the pyrophyllite pressure medium made analysis of the recorded diffraction images difficult. Because the boron epoxy pressure medium was composed of amorphous boron, it did not yield an unfavorable diffraction pattern.…”

Section: Methodsmentioning

confidence: 99%

<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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High-pressure synthesis of novel compounds in an Mg–Ni system

Cited by 49 publications

References 24 publications

Improved reversible dehydrogenation of 2LiBH₄+MgH₂ system by introducing Ni nanoparticles

Improved reversible dehydrogenation of 2LiBH₄+MgH₂ system by introducing Ni nanoparticles

Li4FeH6: Iron-containing complex hydride with high gravimetric hydrogen density

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

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High-pressure synthesis of novel compounds in an Mg–Ni system

Cited by 49 publications

References 24 publications

Improved reversible dehydrogenation of 2LiBH4+MgH2 system by introducing Ni nanoparticles

Improved reversible dehydrogenation of 2LiBH4+MgH2 system by introducing Ni nanoparticles

Li4FeH6: Iron-containing complex hydride with high gravimetric hydrogen density

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

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Improved reversible dehydrogenation of 2LiBH₄+MgH₂ system by introducing Ni nanoparticles

Improved reversible dehydrogenation of 2LiBH₄+MgH₂ system by introducing Ni nanoparticles