Mg2Ni-based ternary Mg-Ni-Cu reversible hydrogen storage material and preparation method thereof

Abstract

The invention discloses a Mg2Ni-based ternary Mg-Ni-Cu reversible hydrogen storage material and a preparation method thereof, and belongs to the technical field of hydrogen storage. According to the composition range of the hydrogen storage material, Mg accounts for 66.7% in alloy atoms, Ni and Cu account for 33.3% in the alloy atoms, Cu accounts for 0-12% in Ni and Cu atoms, and the purity of raw materials is not lower than 99.5%. According to the method, Ni(Cu) solid solution powder high in chemical stability is prepared firstly, and then the solid solution powder and Mg powder are mixed and sintered according to a proportion to obtain the Mg2Ni-based ternary Mg20Ni10-xCux reversible hydrogen storage material high in purity, wherein x is larger than 0 and smaller than or equal to 1.2. The material is high in hydrogen storage capacity (larger than 3.5 wt%) and good in low-temperature hydrogen desorption kinetics performance. Cu replaces Ni being precious metal, so that the material use cost is lowered. The preparation method has the remarkable advantages that the process is gentle, simple and easy to control, the production equipment is low in cost, the production process is free of pollution and industrial mass production is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage, in particular to a Mg 2 Ni-type ternary Mg-Ni-Cu reversible hydrogen storage material system and its new preparation method. Background technique [0002] Hydrogen energy, wind energy, solar energy, and biomass energy are considered to be the most promising green energy sources. The key to the utilization of hydrogen energy is the development of hydrogen storage materials and their preparation technologies. Mg-based hydrogen storage materials have been extensively studied due to the advantages of large hydrogen storage capacity, low cost, and light weight. where Mg 2 Ni alloys are widely used in gaseous hydrogen storage and electrochemical anodes due to their high hydrogen storage capacity (3.6% hydrogen by mass), low hydrogen depletion temperature (about 250 °C) and fast dehydrogenation kinetics. Material. A large number of studies have shown that the replacement of Ni by transitio...

AI Technical Summary

Problems solved by technology

The current background technology shows that there is no preparation method that can successfully prepare hydrogen storage mechanism and Mg 2 The high-purity ternary Mg-Ni-Cu material that is exactly the same as Ni, that is, the real realization of Cu replacing Ni in the hydrogen absorption and desorption process (hydrogen absorption to form Mg 2 (Ni,Cu)H 4 , release hydrogen to form Mg 2 (Ni,Cu))

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