New Aspects of MgH2 Morphological and Structural Changes during High-Energy Ball Milling

Czujko, Tomasz; Oleszek, Ewelina E.; Szot, Mariusz

doi:10.3390/ma13204550

Cited by 15 publications

(11 citation statements)

References 44 publications

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“…The morphologies of pure MgH 2 , milled MgH 2 , and 10 wt.% of LaCoO 3 with MgH 2 were investigated by SEM as shown in Figure 6 . The SEM of pure MgH 2 shown in Figure 6 a revealed that the particles have a larger size and flakelike shapes, as reported by Czujko et al [ 44 ]. Even though the samples were analyzed at different magnifications, as displayed in Figure 6 b,d, both samples suggest that ball milling produces inhomogeneity, some agglomeration, and reduction in the MgH 2 samples caused by the ball collision.…”

Section: Resultssupporting

confidence: 79%

Effect of LaCoO3 Synthesized via Solid-State Method on the Hydrogen Storage Properties of MgH2

et al. 2023

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One of the ideal energy carriers for the future is hydrogen. It has a high energy density and is a source of clean energy. A crucial step in the development of the hydrogen economy is the safety and affordable storage of a large amount of hydrogen. Thus, owing to its large storage capacity, good reversibility, and low cost, Magnesium hydride (MgH2) was taken into consideration. Unfortunately, MgH2 has a high desorption temperature and slow ab/desorption kinetics. Using the ball milling technique, adding cobalt lanthanum oxide (LaCoO3) to MgH2 improves its hydrogen storage performance. The results show that adding 10 wt.% LaCoO3 relatively lowers the starting hydrogen release, compared with pure MgH2 and milled MgH2. On the other hand, faster ab/desorption after the introduction of 10 wt.% LaCoO3 could be observed when compared with milled MgH2 under the same circumstances. Besides this, the apparent activation energy for MgH2–10 wt.% LaCoO3 was greatly reduced when compared with that of milled MgH2. From the X-ray diffraction analysis, it could be shown that in-situ forms of MgO, CoO, and La2O3, produced from the reactions between MgH2 and LaCoO3, play a vital role in enhancing the properties of hydrogen storage of MgH2.

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Section: Resultssupporting

confidence: 79%

Effect of LaCoO3 Synthesized via Solid-State Method on the Hydrogen Storage Properties of MgH2

et al. 2023

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“…The 10 wt% TiSiO 4 -added LiAlH 4 composite has a larger surface area due to the smaller particle sizes. Previous research has shown that surface modification significantly improves the hydrogen storage properties of metals and complex hydride materials [ 34 , 45 , 46 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

Boosting the Dehydrogenation Properties of LiAlH4 by Addition of TiSiO4

et al. 2023

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Given its significant gravimetric hydrogen capacity advantage, lithium alanate (LiAlH4) is regarded as a suitable material for solid-state hydrogen storage. Nevertheless, its outrageous decomposition temperature and slow sorption kinetics hinder its application as a solid-state hydrogen storage material. This research’s objective is to investigate how the addition of titanium silicate (TiSiO4) altered the dehydrogenation behavior of LiAlH4. The LiAlH4–10 wt% TiSiO4 composite dehydrogenation temperatures were lowered to 92 °C (first-step reaction) and 128 °C (second-step reaction). According to dehydrogenation kinetic analysis, the TiSiO4-added LiAlH4 composite was able to liberate more hydrogen (about 6.0 wt%) than the undoped LiAlH4 composite (less than 1.0 wt%) at 90 °C for 2 h. After the addition of TiSiO4, the activation energies for hydrogen to liberate from LiAlH4 were lowered. Based on the Kissinger equation, the activation energies for hydrogen liberation for the two-step dehydrogenation of post-milled LiAlH4 were 103 and 115 kJ/mol, respectively. After milling LiAlH4 with 10 wt% TiSiO4, the activation energies were reduced to 68 and 77 kJ/mol, respectively. Additionally, the scanning electron microscopy images demonstrated that the LiAlH4 particles shrank and barely aggregated when 10 wt% of TiSiO4 was added. According to the X-ray diffraction results, TiSiO4 had a significant effect by lowering the decomposition temperature and increasing the rate of dehydrogenation of LiAlH4 via the new active species of AlTi and Si-containing that formed during the heating process.

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“…This proved that the performance of MgH 2 was also directly affected by the milling process. Next, changes in the morphological parameters of the powder can also be detected by Czujko et al [ 61 ]. According to Shahi et al [ 62 ], the onset desorption temperature of pure MgH 2 decreased from 422 °C to 367 °C.…”

Section: Resultsmentioning

confidence: 99%

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

2023

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Magnesium hydrides (MgH2) have drawn a lot of interest as a promising hydrogen storage material option due to their good reversibility and high hydrogen storage capacity (7.60 wt.%). However, the high hydrogen desorption temperature (more than 400 °C) and slow sorption kinetics of MgH2 are the main obstacles to its practical use. In this research, nickel zinc oxide (Ni0.6Zn0.4O) was synthesized via the solid-state method and doped into MgH2 to overcome the drawbacks of MgH2. The onset desorption temperature of the MgH2–10 wt.% Ni0.6Zn0.4O sample was reduced to 285 °C, 133 °C, and 56 °C lower than that of pure MgH2 and milled MgH2, respectively. Furthermore, at 250 °C, the MgH2–10 wt.% Ni0.6Zn0.4O sample could absorb 6.50 wt.% of H2 and desorbed 2.20 wt.% of H2 at 300 °C within 1 h. With the addition of 10 wt.% of Ni0.6Zn0.4O, the activation energy of MgH2 dropped from 133 kJ/mol to 97 kJ/mol. The morphology of the samples also demonstrated that the particle size is smaller compared with undoped samples. It is believed that in situ forms of NiO, ZnO, and MgO had good catalytic effects on MgH2, significantly reducing the activation energy and onset desorption temperature while improving the sorption kinetics of MgH2.

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New Aspects of MgH2 Morphological and Structural Changes during High-Energy Ball Milling

Cited by 15 publications

References 44 publications

Effect of LaCoO3 Synthesized via Solid-State Method on the Hydrogen Storage Properties of MgH2

Effect of LaCoO3 Synthesized via Solid-State Method on the Hydrogen Storage Properties of MgH2

Boosting the Dehydrogenation Properties of LiAlH4 by Addition of TiSiO4

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

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