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<p>Hydrogen storage remains a critical challenge in advancing clean energy technologies owing to the limitations in the kinetics and thermodynamics of conventional hydrides. In this study, the effects of Ni- and Ti-based alloys (La &lt; <sub>8</sub> &gt;  &lt; <sub>8</sub> &gt; Nd &lt; <sub>8</sub> &gt; .<sub>5</sub>Ti<sub>1</sub>.<sub>1</sub>Ni<sub>33</sub>.<sub>9</sub>Co<sub>32</sub>.<sub>9</sub>Al<sub>0</sub>.<sub>65</sub>, NiMn<sub>9</sub>.<sub>3</sub>Al<sub>4</sub>.<sub>0</sub>Co<sub>14</sub>.<sub>1</sub>Fe<sub>3</sub>.<sub>6</sub>, and NiMnAl) on the hydrogenation/dehydrogenation behavior of MgH<sub>2</sub> was systematically investigated. The nanocomposites were synthesized via high-energy ball milling and characterized using X-ray diffraction (XRD), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). Kinetic analysis using Kissinger’s method revealed that alloying substantially lowered the activation energy of MgH<sub>2</sub>, with the most significant improvement being achieved for MgH<sub>2</sub>–25 wt% NiMnAl (79.15&#xa0;kJ/mol). The onset desorption temperature was also markedly reduced, indicating the enhanced hydrogen sorption kinetics. These findings demonstrate that NiMnAl exhibits the most effective catalytic performance among the tested alloys, offering a promising pathway for the development of advanced Mg-based hydrogen-storage systems.</p> Graphical Abstract <p></p>

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Enhanced Hydrogen Storage Performance of MgH2 with NiMnAl and Ti-Based Alloy Catalysts: A Comparative Study

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Priyanka Chholak,
  • Ravinder Singh Maan,
  • Shruti Thapar,
  • Indra Prabh Jain,
  • Saurabh Dubey

摘要

Hydrogen storage remains a critical challenge in advancing clean energy technologies owing to the limitations in the kinetics and thermodynamics of conventional hydrides. In this study, the effects of Ni- and Ti-based alloys (La < 8 >  < 8 > Nd < 8 > .5Ti1.1Ni33.9Co32.9Al0.65, NiMn9.3Al4.0Co14.1Fe3.6, and NiMnAl) on the hydrogenation/dehydrogenation behavior of MgH2 was systematically investigated. The nanocomposites were synthesized via high-energy ball milling and characterized using X-ray diffraction (XRD), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). Kinetic analysis using Kissinger’s method revealed that alloying substantially lowered the activation energy of MgH2, with the most significant improvement being achieved for MgH2–25 wt% NiMnAl (79.15 kJ/mol). The onset desorption temperature was also markedly reduced, indicating the enhanced hydrogen sorption kinetics. These findings demonstrate that NiMnAl exhibits the most effective catalytic performance among the tested alloys, offering a promising pathway for the development of advanced Mg-based hydrogen-storage systems.

Graphical Abstract