Mg-In-Ag ternary hydrogen storage material and preparation method thereof

Abstract

The invention discloses an Mg-In-Ag ternary hydrogen storage alloy system and a preparation method thereof, which belong to the technical field of the hydrogen storage material. The hydrogen storage material consists of the following components: the atomic percentage of (Mg + In) is 80 to 85 percent, wherein the content of In accounts for 3 to 6 percent in (Mg + In), and the balance is Ag. The preparation method comprises the following steps of measuring Mg blocks and Ag pieces according to the alloy components, firstly smelting Mg-Ag binary low-melting-point alloy by adopting a sensing smelting furnace, then measuring In blocks according to the proportion, smelting the In blocks with the binary alloy to obtain the Mg-In-Ag ternary alloy; grinding the alloy with the surface oxide skin being removed into alloy powder, placing the alloy powder into a ball-milling tank with hydrogen, and mechanically and chemically preparing the high-activity powder hydrogen storage material which can be directly used as a final hydrogen storage material product. The hydrogen storage material has the characteristics that the activation for absorbing and releasing the hydrogen is not needed, the hydrogen storage capacity is large, the temperature for absorbing and releasing the hydrogen is low and the speed for absorbing and releasing the hydrogen is high.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage, in particular to a novel magnesium-based hydrogen storage material system and a new preparation method thereof. Background technique [0002] As a hydrogen storage material, magnesium metal has the advantages of low density, high hydrogen storage capacity (7.6 wt.%), abundant resources, and low price. Therefore, magnesium-based hydrogen storage alloys are the most promising hydrogen storage materials. For now, the wider hydrogen storage application of Mg and Mg-based alloys should solve the following problems: (1) It is difficult to activate the hydrogen absorption and desorption of such alloys (generally, 3 to 8 hydrogen absorption and desorption cycles are required for activation); (2) The hydrogen absorption and desorption speed is slow, that is, the kinetic performance of hydrogen absorption and desorption is poor; (3) the thermodynamic performance of hydrogen absorption and desorpt...

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Problems solved by technology

For now, the wider hydrogen storage application of Mg and Mg-based alloys should solve the following problems: (1) The hydrogen absorption and desorption activation of this type of alloy is difficult (generally, 3-8 hydrogen absorption and desorption cycles are required for activation); (2) The rate of hydrogen absorption and desorption is slow, that is, the kinetic performance of hydrogen absorption and desorption is poor; (3) the thermodynamic performance of hydrogen absorption and desorption is poor, and it usually needs to be around 350 °C to effectively absorb and desorb hydrogen

The milling time of this method is too long (about 170 h)[F. P. Luo, H. Wang, L. Z. Ouyang, M. Q. Zeng, J. W. Liu and M. Zhu, Int. J. Hydrogen Energy, 38 (2013), 10912], which has the disadvantages of time-consuming and energy-consuming and long-term ball milling to bring impurities into the tank wall; subsequent sintering further increases the preparation time and energy consumption, and the hydrogen storage material is easy to oxidize during the sintering process, so that the sintering process is difficult to control, resulting in the preparation of The cost has increased significantly

Therefore, the difficulty in preparation is the main bottleneck in the development and application of In-containing ternary Mg-based hydrogen storage alloys.

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