High-performance high-capacity hydrogen storage alloy for fuel cell and preparation method of hydrogen storage alloy

Abstract

The invention relates to a high-performance high-capacity hydrogen storage alloy for a fuel cell and a preparation method of the hydrogen storage alloy. The chemical composition of the hydrogen storage alloy is expressed as Mg80+x(Ce, Y)a(Ni, Co)b according to an atomic ratio, wherein x is greater than or equal to 0 and less than and equal to 15, a is greater than or equal to 0 and less than and equal to 10, and b is greater than or equal to 5 and less than and equal to 20; and a+b is greater than or equal to 5 and less than and equal to 20. The alloy has a double-platform collaboration mechanism. According to the preparation method, a 3+1 metallurgy method, a two-step smelting method and a one-step ball milling method are adopted, volatilization of magnesium is effectively inhibited, theuniformity of alloy components is guaranteed, meanwhile, solid solution of Mg-Ni and Mg-Co compounds is avoided, and two single magnesium compounds can be generated. After repeated hydrogenation, an Mg2Ni / Mg2NiH4 cycle with high platform pressure and an Mg6Co2H11 / Mg2CoH5 cycle with low platform pressure are formed. The Mg / MgH2 is induced to preferentially nucleate by double platforms, so that themechanical properties are improved, and the reaction temperature is reduced. The hydrogen absorption capacity of the hydrogen storage alloy is larger than 5 wt.%, and the hydrogen storage alloy has fast hydrogen absorption and desorption kinetics and is expected to become a solid hydrogen source of the fuel cell.

Description

technical field [0001] The invention belongs to the field of magnesium-based hydrogen storage alloys and preparation techniques thereof, and in particular relates to a high-performance and high-capacity hydrogen storage alloy for fuel cells with a dual-platform synergy mechanism and a preparation method thereof. Background technique [0002] Hydrogen is a clean and efficient energy carrier, which can be produced not only from fossil resources, but also from various primary energy sources such as nuclear energy and renewable resources. This is not only conducive to the realization of my country's multi-energy optimization strategy, but also conducive to the realization of CO2 in the production of hydrogen fuel. 2 centralized processing. In addition, hydrogen energy can be efficiently converted into heat and electricity through fuel cells during use, while achieving near-zero emissions. It can be seen that hydrogen energy is an important bridge connecting fossil energy to re...

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Problems solved by technology

In view of this, many technologies at home and abroad have been studied, including preparation technology, composition design, catalytic modification, surface modification, and compounding of various materials. Some results have been obtained, but they still cannot meet the vehicle requirements formulated by the US Department of Energy.

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