A magnesium-based hydrogen storage alloy containing a long-period ordered stacking structure and its preparation method

Abstract

A magnesium-based hydrogen storage alloy containing a long-period ordered stacking structure, its chemical formula is Mg‑aX‑bY‑cLi, X represents one of V or Co, a, b, and c represent mass percentages, 3% ≤a≤8%, 17%≤b≤19%, 0.5%≤c≤1%, and the balance is Mg; the preparation method of the above-mentioned magnesium-based hydrogen storage alloy is mainly to put the alloy particles of the above-mentioned composition into a ball mill tank, and press Add 4-6mm stainless steel grinding balls at a ball-to-material ratio of 15:1-20:1, rotate at a speed of 300-400r / min, stop for 10 minutes after running for 30 minutes, and obtain powder with an average particle size of 50-90nm after ball milling for 30-50 hours , placed in a vacuum high-temperature furnace, heated to 200°C in an argon atmosphere and kept at a temperature of 24 hours, to prepare a magnesium-based hydrogen storage alloy with a long-period ordered stacking structure. The process equipment of the invention is simple and easy to control, and the cost is low, the hydrogen absorption and desorption temperature of the prepared magnesium-based hydrogen storage alloy is moderate, and the hydrogen absorption and desorption kinetic performance is good.

Description

[0001] Inventors: Peng Qiuming; Wang Dongbin; Ge Bingcheng. technical field [0002] The invention relates to a magnesium-based hydrogen storage alloy with a long-period ordered stacking structure and a preparation method thereof. Background technique [0003] With the reduction of fossil fuels and the increasing severity of environmental pollution, people urgently need to find a new energy source without environmental pollution. Hydrogen energy has many advantages such as cleanness, high energy, and no secondary pollution. Therefore, the development of hydrogen energy has aroused great interest. The hydrogen energy system includes hydrogen source development, hydrogen production technology, hydrogen storage technology, hydrogen utilization technology, etc. In the entire hydrogen energy system, hydrogen storage is the most critical link. [0004] Mg-based hydrogen storage alloys are one of the most promising hydrogen storage materials due to their high hydrogen storage cap...

AI Technical Summary

Problems solved by technology

For example, LaMg was studied as early as the 1980s 12 , CeMg 12 , MmMg 12 , La 2 Mg 17 and La 2 Mg 16 The hydrogen storage performance of Ni, found that although this type of Mg-based alloy can absorb hydrogen at a lower temperature, the hydrogen absorption capacity is low, less than 4wt%, and the hydrogen desorption temperature is still high, greater than 300 ° C

Moreover, Mg recently studied by Ouyang Liuzhang et al. 3 Pr and Mg 3 PrNi 0.1 It can absorb hydrogen at room temperature, and the kinetic performance of hydrogen absorption and desorption is very good, the reversible hydrogen storage capacity is 2.58wt% and 3.23wt%, but the dehydrogenation temperature is still very high, about 300 ° C

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