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<p>This study investigates the effects of wet ball milling on the hydrogen storage properties of the Mg<sub>2</sub>Ni alloy, which was prepared using vacuum induction melting. x-ray diffraction (XRD), and transmission electron microscopy (TEM) analyses reveal that ball milling refines the alloy’s structure, generating nanocrystalline and amorphous phases that enhance hydrogen diffusion. Pressure–composition–temperature (PCT) tests and differential scanning calorimetry (DSC) analyses demonstrate that ball milling significantly improves the activation and kinetics of hydrogen absorption and desorption, while also reducing the hydrogen absorption enthalpy. Wet ball milling, utilizing petroleum ether as a medium, offers advantages such as improved temperature control and reduced oxidation. The optimal milling duration of 6 h yields the best hydrogen storage performance, characterized by decreased dehydrogenation activation energy and enhanced thermodynamic properties. Additionally, the alloy shows good cyclic stability. This work provides valuable insights into optimizing the ball-milling process for Mg<sub>2</sub>Ni hydrogen storage alloys, thereby advancing their application in hydrogen energy storage.</p>

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Optimization of Mg2Ni Hydrogen Storage Alloy via Wet Ball Milling: Structural and Kinetic Insights

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Yi-Fei Yang,
  • Jia-Qi Zhu,
  • Xu Jin,
  • Feng Hu,
  • Rui-han Li,
  • Jun-yu Bai,
  • Li Wang

摘要

This study investigates the effects of wet ball milling on the hydrogen storage properties of the Mg2Ni alloy, which was prepared using vacuum induction melting. x-ray diffraction (XRD), and transmission electron microscopy (TEM) analyses reveal that ball milling refines the alloy’s structure, generating nanocrystalline and amorphous phases that enhance hydrogen diffusion. Pressure–composition–temperature (PCT) tests and differential scanning calorimetry (DSC) analyses demonstrate that ball milling significantly improves the activation and kinetics of hydrogen absorption and desorption, while also reducing the hydrogen absorption enthalpy. Wet ball milling, utilizing petroleum ether as a medium, offers advantages such as improved temperature control and reduced oxidation. The optimal milling duration of 6 h yields the best hydrogen storage performance, characterized by decreased dehydrogenation activation energy and enhanced thermodynamic properties. Additionally, the alloy shows good cyclic stability. This work provides valuable insights into optimizing the ball-milling process for Mg2Ni hydrogen storage alloys, thereby advancing their application in hydrogen energy storage.