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<p>Mg-based materials are considered one of the most promising hydrogen storage materials due to their high hydrogen storage capacity, low cost, and natural abundance. However, for practical applications, in addition to solving their thermodynamic stability and slow hydrogen absorption/desorption kinetics, other factors such as heat transfer efficiency, stability, pulverization, and volumetric hydrogen storage density should also be taken into consideration. In this study, Mg<sub>90</sub>Ni<sub>5</sub>La<sub>5</sub> alloy with excellent hydrogen storage performance was selected as the raw material. After hydrogenation, the graphite (GR) was introduced as a&#xa0;catalyst to enhance both hydrogen storage properties and thermal conductivity of the&#xa0;alloy hydride. The results showed that 5&#xa0;wt.% GR is the optimal addition amount. Furthermore, the composites were compacted to further increase the volumetric hydrogen storage density and improve the stability. Compared to alloy, using alloy hydride as raw materials significantly reduced volumetric expansion effects and pulverization of pellets. Moreover, the stability of pellets in air and water was significantly improved. By the use of alloy hydride, GR addition, and compaction, this work demonstrates that the synergistic strategy can effectively enhance hydrogen absorption/desorption kinetics, reduce pulverization, and improve volumetric density, thermal conductivity, and short-term air tolerance of Mg-based materials.</p>

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Behavior of Compacted Mg90Ni5La5 Alloy Hydride/Graphite Composite Powders for Hydrogen Storage Applications

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Wentao Zhang,
  • Yichuan Wang,
  • Xiaoyue Huang,
  • Lingxing Shi,
  • Chaoqun Xia,
  • Tai Yang

摘要

Mg-based materials are considered one of the most promising hydrogen storage materials due to their high hydrogen storage capacity, low cost, and natural abundance. However, for practical applications, in addition to solving their thermodynamic stability and slow hydrogen absorption/desorption kinetics, other factors such as heat transfer efficiency, stability, pulverization, and volumetric hydrogen storage density should also be taken into consideration. In this study, Mg90Ni5La5 alloy with excellent hydrogen storage performance was selected as the raw material. After hydrogenation, the graphite (GR) was introduced as a catalyst to enhance both hydrogen storage properties and thermal conductivity of the alloy hydride. The results showed that 5 wt.% GR is the optimal addition amount. Furthermore, the composites were compacted to further increase the volumetric hydrogen storage density and improve the stability. Compared to alloy, using alloy hydride as raw materials significantly reduced volumetric expansion effects and pulverization of pellets. Moreover, the stability of pellets in air and water was significantly improved. By the use of alloy hydride, GR addition, and compaction, this work demonstrates that the synergistic strategy can effectively enhance hydrogen absorption/desorption kinetics, reduce pulverization, and improve volumetric density, thermal conductivity, and short-term air tolerance of Mg-based materials.