Two-dimensional titanium carbide-doped lithium aluminum hydride hydrogen storage material and preparation method thereof

Abstract

The invention discloses a two-dimensional titanium carbide-doped lithium aluminum hydride hydrogen storage material. The two-dimensional titanium carbide-doped lithium aluminum hydride hydrogen storage material is prepared by mixing lithium aluminum hydride and two-dimensional titanium carbide Ti3C2 and performing mechanical ball milling, wherein the two-dimensional titanium carbide Ti3C2 is prepared by carrying out a reaction between Ti3AlC2 and hydrofluoric acid. A preparation method of the material comprises the following steps: 1, preparing the two-dimensional Ti3C2; 2, preparing the two-dimensional titanium carbide-doped lithium aluminum hydride hydrogen storage material. Under the catalytic action of the two-dimensional Ti3C2, the hydrogen storage material has the initial dehydrogenation temperature of 43-68 DEG C, which is 129-154 DEG C lower than that of the pure lithium aluminum hydride, the total hydrogen release amount thereof reaches 4.6-7.2wt%, and the initial dehydrogenation temperature thereof is 148.2 DEG C lower than that of the original lithium aluminum hydride; at 150 DEG C, 3.7 wt% of hydrogen can be released within 15 minutes; at 200 DEG C, 5.3 wt% of hydrogencan be released within 15 minutes. Therefore, the hydrogen storage material has excellent hydrogen storage and release performance, and the prepared two-dimensional Ti3C2 can significantly improve thehydrogen release performance of the lithium aluminum hydride, so that the hydrogen storage material shows excellent hydrogen release performance at relatively low temperature.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage materials for new energy materials, in particular to a two-dimensional titanium carbide-doped lithium aluminum hydride hydrogen storage material and a preparation method thereof. Background technique [0002] With the rapid progress of science and technology and the rapid development of industrial society, human beings are gradually facing the problem of energy crisis. For this reason, people have developed and utilized many new energy sources or unconventional energy sources. It refers to energy sources that have not been used or are being actively researched and are yet to be promoted, including solar energy, water energy, wind energy, biomass energy, hydrogen energy, and nuclear energy. Hydrogen energy is used as a Green energy and energy carrier with abundant reserves, wide sources and high energy density. The application of hydrogen energy involves three key technologies: preparatio...

AI Technical Summary

Problems solved by technology

Additives for lithium aluminum hydride usually include metals (such as Ti, Fe, Ni, V, etc.), alloys (such as Al3Ti, Al3Fe, etc.), metal halides (such as TiF3, TiCl4, TiCl3, etc.), metal hydrides (such as TiH2) and carbon materials (such as carbon nanotubes), and the addition of additives improves the dehydrogenation kinetics of lithium aluminum hydride, but the existing system still has the disadvantage of high dehydrogenation temperature, and the addition of additives is the key to the hydrogen storage capacity of the system Significantly reduced, unable to meet DOE requirements

[0004] Therefore, the technical problem in the existing technology is to reduce the hydrogen desorption temperature of lithium aluminum hydride, improve its hydrogen desorption kinetics, and ensure that the hydrogen storage capacity of the system meets the requirements of DOE, so that the potential of lithium aluminum hydride in practical applications

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