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<p>A simple and environmentally friendly flux-free vacuum casting followed by brief high-energy ball milling was employed to produce nanocrystalline Mg–Ni alloys suitable for hydrogen storage. The alloy primarily formed the Mg₂Ni phase, with a crystallite size of 38.6&#xa0;nm, as confirmed by X-ray diffraction. Upon hydrogenation, Mg<sub>2</sub>Ni transformed predominantly into Mg<sub>2</sub>NiH<sub>4</sub>, with additional MgH<sub>2</sub> formation, demonstrating efficient hydrogen absorption. Field emission scanning electron microscopy revealed significant microstructural changes during hydrogenation, enhancing hydrogen diffusion. Nitrogen adsorption/desorption isotherms showed a fourfold increase in specific surface area post-hydrogenation, from 3.85 to 15.32&#xa0;m<sup>2</sup>/g. The alloy achieved a maximum hydrogen storage capacity of 3.54&#xa0;wt.% at 573&#xa0;K, with enhanced absorption kinetics after activation. These results highlight the potential of Mg–Ni alloys for hydrogen storage, emphasizing the importance of optimized synthesis and activation processes for enhanced performance and stability.</p> Graphical Abstract <p></p>

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Efficient hydrogen storage with nanocrystalline mg–ni alloy: enhanced absorption and kinetics via mechanochemical synthesis

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Linh Chi Dinh,
  • Phuong Dinh Doan,
  • Duy Van Lai,
  • Toan Van Nguyen,
  • Trang Thi Pham,
  • Van Thi Hong Phung,
  • Matteo Tonezzer,
  • Duong Duc La,
  • Tung Thanh Nguyen,
  • Trung Bao Tran

摘要

A simple and environmentally friendly flux-free vacuum casting followed by brief high-energy ball milling was employed to produce nanocrystalline Mg–Ni alloys suitable for hydrogen storage. The alloy primarily formed the Mg₂Ni phase, with a crystallite size of 38.6 nm, as confirmed by X-ray diffraction. Upon hydrogenation, Mg2Ni transformed predominantly into Mg2NiH4, with additional MgH2 formation, demonstrating efficient hydrogen absorption. Field emission scanning electron microscopy revealed significant microstructural changes during hydrogenation, enhancing hydrogen diffusion. Nitrogen adsorption/desorption isotherms showed a fourfold increase in specific surface area post-hydrogenation, from 3.85 to 15.32 m2/g. The alloy achieved a maximum hydrogen storage capacity of 3.54 wt.% at 573 K, with enhanced absorption kinetics after activation. These results highlight the potential of Mg–Ni alloys for hydrogen storage, emphasizing the importance of optimized synthesis and activation processes for enhanced performance and stability.

Graphical Abstract