A two-dimensional titanium carbide doped lithium aluminum hydride hydrogen storage material and its preparation method

Abstract

The invention discloses a two-dimensional titanium carbide doped lithium aluminum hydride hydrogen storage material, which consists of lithium aluminum hydride and two-dimensional titanium carbide Ti 3 C 2 Prepared by mixed mechanical ball milling, two-dimensional titanium carbide Ti 3 C 2 by Ti 3 AlC 2 And hydrofluoric acid reaction in the system. Its preparation method comprises: step 1, two-dimensional Ti 3 C 2 Preparation and step 2, two-dimensional titanium carbide doped lithium aluminum hydride hydrogen storage material preparation. The hydrogen storage material of the present invention is in two-dimensional Ti 3 C 2 Under the action of catalysis, the initial dehydrogenation temperature is 43-68°C, which is 129-154°C lower than that of pure lithium aluminum hydride, and its total hydrogen release capacity reaches 4.6-7.2 wt%, and its initial dehydrogenation temperature is lower than that of original lithium aluminum hydride 148.2°C; at 150°C, 3.7 wt% hydrogen can be released in 15 minutes; at 200°C, 5.3 wt% hydrogen can be released in 15 minutes. Therefore, the hydrogen storage material of the present invention has excellent hydrogen storage and desorption properties, and the prepared two-dimensional Ti 3 C 2 It can significantly improve the hydrogen desorption performance of lithium aluminum hydride, so that it exhibits excellent hydrogen desorption performance at lower temperatures.

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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