A MXene hydrogen storage material catalyst, a hydrogen storage material containing the catalyst and a preparation method

By preparing an MXene catalyst with optimized surface functional group density and combining it with MgH2, the problem of poor kinetic performance of magnesium-based hydrogen storage materials was solved, achieving efficient hydrogen storage and release at low temperatures, which is suitable for large-scale production.

CN117085713BActive Publication Date: 2026-06-09CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHONGQING UNIV
Filing Date
2023-08-23
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing magnesium-based hydrogen storage materials lack effective catalytic active sites, resulting in poor hydrogen absorption and desorption kinetics and excessively high operating temperatures, which limits their practical applications.

Method used

An optimized MXene hydrogen storage catalyst with a surface functional group density of 25-39 at.% was prepared by treating the MAX phase with an etching solution and then heat-treating it in an Ar/H2 atmosphere. The catalyst was then combined with MgH2 and the composite hydrogen storage material was prepared by ball milling.

Benefits of technology

A good match was achieved between hydrogen dissociation and diffusion processes, which improved the catalytic activity of magnesium-based hydrogen storage materials. The composite hydrogen storage material exhibited excellent hydrogen release and absorption performance at low temperatures and maintained a high hydrogen storage capacity after multiple cycles.

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Abstract

This invention relates to an MXene hydrogen storage catalyst, a hydrogen storage material containing the catalyst, and a preparation method thereof, belonging to the field of hydrogen storage technology. The MXene hydrogen storage catalyst has a surface functional group density of 25–39 at.%, which not only facilitates the adsorption and dissociation of hydrogen molecules by the transition metal in MXene but also promotes the diffusion of hydrogen atoms, achieving a good match between the hydrogen dissociation and diffusion processes. This catalyst exhibits higher catalytic activity and has significant advantages in improving the performance of magnesium-based hydrogen storage. When combined with MgH2, the composite hydrogen storage material releases 6.10 wt.% hydrogen within 4 minutes at 280°C and absorbs 5.26 wt.% hydrogen within 60 seconds at 100°C. Furthermore, after 50 hydrogen absorption / desorption cycles, the composite hydrogen storage material still retains a hydrogen storage capacity of over 4.8 wt.%. The catalyst exhibits good stability, a simple preparation process, and readily available raw materials, making it suitable for large-scale production.
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