A high-performance double rare earth solid solution-based hydrogen storage material and its preparation method

Abstract

The invention relates to a high-performance double rare earth solid solution-based hydrogen storage alloy and a preparation method thereof. The hydrogen storage alloy includes a fair component of Mg 90‑a‑b RE1 a RE2 b alloy, and RE1 and RE2 are respectively a kind of lanthanide rare earth elements. The preparation method is to use medium frequency induction smelting technology to heat and smelt under the protection of inert gas, inject the molten alloy into a copper mold, and obtain a cylindrical alloy ingot after cooling, then mechanically crush and grind the ingot into a powder with a particle size of 200 meshes, and Add stearic acid as an additive in a mass ratio of cwt.%, then carry out high-energy ball milling, and then fully hydrogenate under a high-purity hydrogen atmosphere, MgH 2 / Mg-(EE1,RE2)H 2+x Composite material, the present invention is nano crystal grain, and is dispersed in Mg / MgH 2 In the matrix, it not only plays the catalytic role of the dihydrogen pump, but also provides a large number of nucleation active sites, grain boundaries and diffusion channels, which improves the hydrogen storage performance. The high hydrogen storage capacity and fast hydrogen absorption and desorption kinetics are maintained; the hydrogen desorption temperature of the hydride is significantly reduced, and the stability of the hydrogen absorption and desorption cycle is significantly improved.

Description

technical field [0001] The invention belongs to the field of rare earth magnesium hydrogen storage alloy material and its preparation process, and in particular relates to a high-performance double rare earth solid solution based hydrogen storage material and its preparation method. Background technique [0002] With the improvement of industrial level and the development of human society, traditional energy sources such as oil and coal are becoming exhausted day by day, and have caused serious pollution to the environment. The living environment and health of human beings are facing a huge threat. Especially in the past two years, smog and haze have occurred frequently, and environmental issues have once again become the focus of attention. In the face of energy and environmental crises, human beings are experiencing unprecedented severe challenges. Therefore, the development and utilization of clean energy is imminent, and hydrogen energy, as a clean, efficient, safe, abu...

AI Technical Summary

Problems solved by technology

However, the disadvantages of magnesium-based hydrogen storage materials are also significant. Due to the stable Mg-H bond, magnesium-based hydrides not only have poor hydrogen desorption kinetics and high dehydrogenation temperature, but also tend to crystallize during the hydrogen absorption and desorption cycle. Problems such as particle growth and particle agglomeration will eventually lead to performance attenuation and poor cycle stability

The existence of these problems makes the application of Mg-based hydrogen storage materials still difficult to realize.

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