A kind of mg-in-ag ternary hydrogen storage material and preparation method thereof

Abstract

The invention discloses a novel Mg-In-Ag ternary hydrogen storage alloy system and a preparation method thereof, belonging to the technical field of hydrogen storage materials. The composition of the hydrogen storage material is as follows: the atomic percentage of (Mg+In) is 80-85%, wherein the proportion of In in (Mg+In) is 3-6%, and the rest is Ag. Weigh the Mg block and Ag sheet according to the alloy composition, use the induction melting furnace to melt the Mg-Ag binary low-melting point alloy first, then weigh the In block according to the proportion and melt it together with the above binary alloy to obtain the Mg-In-Ag ternary alloy The alloy is ground into alloy powder after removing the surface oxide skin, and then put into a ball mill jar filled with hydrogen to prepare a highly active powder hydrogen storage material by mechanochemistry, which can be directly used as the final hydrogen storage material product. The hydrogen storage material of the invention has the characteristics of no need for hydrogen absorption and desorption activation, high hydrogen storage capacity, low hydrogen absorption and desorption temperature, and fast hydrogen absorption and desorption rate.

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...

AI Technical Summary

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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