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<p>Magnesium hydride (MgH<sub>2</sub>) is regarded as a highly promising material for solid-state hydrogen storage. However, the inherent kinetic and thermodynamic properties of MgH<sub>2</sub> severely limit its practical applications. To address the slow kinetic properties of MgH<sub>2</sub>, in this paper, a NiCo/CNT catalyst consisting of Nickel–cobalt layered double hydroxide (NiCo-LDH) and carbon nanotubes (CNT) was synthesized by a hydrothermal method and successfully introduced into MgH<sub>2</sub> by a ball-milling method. The results show that the MgH<sub>2</sub>-10 NiCo/CNT composites exhibit good hydrogen absorption and desorption kinetics. The MgH<sub>2</sub>-10 NiCo/CNT composites start to releases hydrogen at 460.7&#xa0;K, which is 117.6&#xa0;K lower than milled MgH<sub>2</sub>. The sample releases 4.91&#xa0;wt% H<sub>2</sub> in 5&#xa0;min at 593&#xa0;K, and its activation energy of hydrogen desorption decreases to 74.78 ± 7.26&#xa0;kJ/mol. After ten cycles, the hydrogen absorption and desorption capacities of the MgH<sub>2</sub>-10 NiCo/CNT sample are maintained at 99.6% and 97.8%, respectively, which shows good cycling stability. Mechanistic analysis shows that the dual “hydrogen pumping” effect of in situ generated Mg<sub>2</sub>Ni/Mg<sub>2</sub>NiH<sub>4</sub> and Mg<sub>2</sub>Co/Mg<sub>2</sub>CoH<sub>5</sub> alters the hydrogen diffusion pathway. This finding provides a viable strategy for enhancing the hydrogenation and dehydrogenation kinetics of MgH<sub>2</sub>.</p> Graphical abstract <p></p>

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Research on the effect of NiCo/CNT addition on hydrogen storage properties of MgH2

  • 期刊论文

  • 发表日期：

    2026年3月22日

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  • Guoqing Zhang,
  • Bolin Sun,
  • Kunlong Xue,
  • Siyuan Ni,
  • Yangping Chen,
  • Xinxi Li

摘要

Magnesium hydride (MgH2) is regarded as a highly promising material for solid-state hydrogen storage. However, the inherent kinetic and thermodynamic properties of MgH2 severely limit its practical applications. To address the slow kinetic properties of MgH2, in this paper, a NiCo/CNT catalyst consisting of Nickel–cobalt layered double hydroxide (NiCo-LDH) and carbon nanotubes (CNT) was synthesized by a hydrothermal method and successfully introduced into MgH2 by a ball-milling method. The results show that the MgH2-10 NiCo/CNT composites exhibit good hydrogen absorption and desorption kinetics. The MgH2-10 NiCo/CNT composites start to releases hydrogen at 460.7 K, which is 117.6 K lower than milled MgH2. The sample releases 4.91 wt% H2 in 5 min at 593 K, and its activation energy of hydrogen desorption decreases to 74.78 ± 7.26 kJ/mol. After ten cycles, the hydrogen absorption and desorption capacities of the MgH2-10 NiCo/CNT sample are maintained at 99.6% and 97.8%, respectively, which shows good cycling stability. Mechanistic analysis shows that the dual “hydrogen pumping” effect of in situ generated Mg2Ni/Mg2NiH4 and Mg2Co/Mg2CoH5 alters the hydrogen diffusion pathway. This finding provides a viable strategy for enhancing the hydrogenation and dehydrogenation kinetics of MgH2.

Graphical abstract