Rapid hydrogen energy storage of self-supporting VS2/NC modified MgH2

Xiaoming Li, Zeming Yuan, Zhenyang Li, Chenxu Liu, Tingting Zhai, Yanghuan Zhang and Tao Li

Energy, 2025, vol. 314, issue C

Abstract: Magnesium metal and its hydride have the characteristics of high hydrogen storage capacity, which is suitable for storing hydrogen energy. In this paper, VS2/NC catalyst supported on nanosheet carbon was synthesized by hydrothermal method with organic matter as raw material, then the MgH2 + x wt% VS2/NC (x = 0, 3, 6, 9) composites were prepared by ball milling with MgH2. The phase characterization of the composite material showed that the VS2 and MgH2 phases in the composite material remain stable during ball milling and subsequently, the hydrogen absorption/desorption cycle. There were V4+ and V2+ ions (an atomic ratio of 3.77:1) in the catalyst. At 593 K, the capacities of the composites were 5.71, 6.11, 5.62, and 5.33 wt% H2, respectively. The time to reach the maximum hydrogen desorption capacity of 95% was 190, 30, 20, and 23 min, respectively. The dehydrogenation activation energy of the material with x = 6 is reduced by nearly 50 kJ/mol H2. The initial dehydrogenation temperature of the material decreases to 323 K. Because of the valence state transition between V ions, the band gap of the composite material is narrowed, which significantly improves the hydrogen absorption and desorption reaction kinetics.

Keywords: Catalytic mechanism; Hydrogen storage kinetics; MgH2 hydrogen storage; Petal-like structure; VS2/NC (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:314:y:2025:i:c:s0360544224040623

DOI: 10.1016/j.energy.2024.134284

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