A hydrogen storage alloy suitable for low-pressure solid-state hydrogen storage and its preparation method

Abstract

The invention discloses a hydrogen storage alloy suitable for low-pressure solid-state hydrogen storage and a preparation method thereof. The hydrogen storage alloy can be composed of R 1‑x‑y m x Mg y (Ni 1‑b T b ) a The general chemical formula shows that, in the formula, x , y , a , b Indicates the molar ratio, 0≤ x ≤0.35, 0.15≤ y ≤0.30, 2.90≤ a ≤4.10, and b The value satisfies 0≤a b ≤0.20; the present invention also provides a preparation method of the above alloy, which prepares a hydrogen storage alloy through batching, smelting and heat treatment. The preparation method is simple and can effectively eliminate AB in the alloy. 5 Phase and AB 2 The phase non-superlattice structure ensures the purity of the superlattice phase structure and the hydrogen storage performance of the obtained alloy. The hydrogen storage alloy prepared has a reversible hydrogen absorption and desorption capacity greater than 1.6wt% at 25~100°C, within 5 minutes That is to absorb and release hydrogen to more than 80% of the maximum capacity, and the hydrogen release platform pressure is greater than 1MPa.

Description

technical field [0001] The invention belongs to the field of new energy materials, and relates to a hydrogen storage alloy suitable for low-pressure solid hydrogen storage and a preparation method thereof. Background technique [0002] The prominence of energy and environmental problems in today's society forces people to seek clean and renewable energy, thus making hydrogen energy with abundant reserves, wide sources, and zero pollution leap into human vision and attract increasing attention. At present, the hydrogen energy industry represented by hydrogen fuel cells is developing rapidly, and has been highly valued by the governments and enterprises of developed countries in the world, and has become a new growth point of the world economy. my country also attaches great importance to the development and application of hydrogen energy. According to the "Blue Book on the Development of China's Hydrogen Energy Industry Infrastructure", it is estimated that by 2030, the numb...

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Problems solved by technology

Among the existing different series of hydrogen storage alloys, AB 5 The type hydrogen storage alloy is easy to activate, has fast hydrogen absorption and desorption speed, and small hysteresis, but the hydrogen storage capacity of the alloy is low, and it is difficult to meet the growing demand of the fuel cell industry, and the AB 2 Type hydrogen storage alloy has a large hydrogen storage capacity, but its hydrogen absorption / desorption platform pressure is low and the cost is high

In addition, common hydrogen storage alloys also include Ti, Zr-based Laves-phase alloys and Mg-based alloys. However, although the former has a high hydrogen storage capacity, it is difficult to activate and has unsatisfactory kinetic properties; while the latter has the most advantage in hydrogen storage capacity, but the absorption The hydrogen desorption temperature is too high and the kinetic performance is sluggish, which restricts its large-scale application

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