Properties of Hydrogen Storage Alloys Formed by Compression Molding AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY24110019

Chinese Library Classification Number:TG139+.7

Citation Information:

Hydrogen storage technology, as an intermediate link in the manufacture, storage and use of hydrogen energy, has become a bottleneck in the large-scale utilisation of hydrogen energy, and the development of solid-state hydrogen storage materials and systems is expected to be the most effective way to solve this problem. In solid-state hydrogen storage, lightweight hydrogen storage alloys represented by rare earth-magnesium-based metal hydrides are characterised by high hydrogen storage density, fast reaction rate of hydrogen absorption and discharge, and good cyclic stability. Meanwhile, powder alloy compaction can increase the volumetric hydrogen storage density. Therefore, magnesium-rich Mg-Ni-（La, Ce) alloys were determined as the research carriers, and the moulding density and volumetric hydrogen storage density of the powder alloys were improved by moulding pressure. Mg₈₇Ni₁₀（La, Ce）₃ and Mg₉₂Ni₄（La, Ce）₄ alloys pressed plates were prepared at pressures of 760, 1140 and 1520 MPa and their hydrogen storage properties were investigated by using a hydrogen storage property tester (PCT) in order to investigate the effect of molding pressure on the hydrogen storage properties of Mg-Ni-RE alloys. X-ray diffraction (XRD) was used to analyze the longitudinal slices of the alloy after hydrogen absorption, scanning electron microscopy (SEM) was used to study the longitudinal slices of the alloy's pressed slices in terms of macroscopic and microscopic pore structures, and to explore the mechanism of the change in the hydrogen storage properties of the alloy after pressing. The results showed that the higher the forming pressure, the higher the number of cycles to complete the activation of the alloy, in which Mg₈₇Ni₁₀（La, Ce）₃ powder alloy could be activated by four cycles of hydrogen absorption and release, and the maximum forming pressure of 1520 MPa under the piezoelectric sheet alloy needed seven cycles of hydrogen absorption and release in order to complete the activation. Activation of Mg₉₂Ni₄（La, Ce）₄ powdered alloy was completed with two cycles of hydrogen uptake and discharge, whereas four cycles of hydrogen uptake and discharge were required to complete the activation of the pressed sheet alloy at a maximum forming pressure of 1520 MPa. At the initial activation stage, the higher the moulding pressure, the lower the mass hydrogen storage density of the alloy, but the effect of the moulding pressure on the mass hydrogen storage density of the alloy decreased as the number of cycles increased. Among them, Mg₈₇Ni₁₀（La, Ce）₃ had a hydrogen uptake capacity of around 5.20% at different pressures for both the pressed and powdered alloys after the eighth cycle of hydrogen uptake, and Mg₉₂Ni₄（La, Ce）₄ had a hydrogen uptake capacity of around 4.78% for both the powdered and pressed alloys after four cycles of hydrogen uptake. The volumetric hydrogen storage densities of Mg₈₇Ni₁₀（La, Ce）₃ and Mg₉₂Ni₄（La, Ce）₄ alloys reached the maximum values of 115.0 and 99.23 g·L⁻¹, respectively, at a moulding pressure of 1520 MPa, which were more than double the volumetric hydrogen storage densities in the powder state. SEM images showed that after the alloy powder press moulding, the particles were broken and deformed, and the specific surface area and porosity of the materials were reduced, which limited the hydrogen diffusion path and increased the barriers to hydrogen diffusion, and ultimately led to a slowing down of the initial hydrogen storage kinetics of the alloys and a significant decrease in the amount of hydrogen stored, but the effect of the moulding pressure on the alloy's hydrogen uptake kinetics gradually decreased with the increase in the number of cycles. XRD analysis showed that after saturation hydrogen absorption in the press-formed alloy, metal hydride phases were formed from the surface layer to the interior, with no unhydrogenated metal phases remaining.