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<p>MgH<sub>2</sub> is a promising solid-state hydrogen storage material; one of the limitations of its scale-application is the slow rate of hydrogen uptake and release. The addition of catalyst to improve the kinetics of MgH<sub>2</sub> has achieved remarkable results. However, these studies require high-speed ball milling (400–500&#xa0;rpm) to achieve the combination of MgH<sub>2</sub> and catalyst, and such harsh processing conditions are difficult to achieve in industrial production. In this work, the catalyst and MgH<sub>2</sub> were efficiently combined at lower milling speed (300&#xa0;rpm) by introducing tetrahydrofuran C<sub>4</sub>H<sub>8</sub>O (THF) as an auxiliary agent. Moreover, milling with THF promotes the nano-crystallization of MgH<sub>2</sub>, which further improves its performance. Results show that THF-assisted MgH<sub>2</sub> absorbed 6.1&#xa0;wt% at 90&#xa0;°C and desorbed 6.1&#xa0;wt% at 275&#xa0;°C, while the MgH<sub>2</sub> milling under the same speed without THF cannot absorb hydrogen and only desorbed 3.3&#xa0;wt%. It reveals that the synergistic effect produced by nano-crystallization and nano-hydrogen pump is the key mechanism of improving the performance of MgH<sub>2</sub> after introducing THF. This work proposes a novel synergistic strategy for modifying MgH<sub>2</sub>, offering practical insights for enhancing its hydrogen storage performance under low-speed ball milling.</p> Graphical abstract

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Improvement on hydrogen storage performance of MgH2 by THF-promoted nano-crystallization under low-speed ball milling

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Ge Gao,
  • Jia-Xing Xie,
  • Liu-Ting Zhang,
  • Chun-Ju Lv,
  • Chao Li,
  • Mei-Qiang Fan,
  • Zhen-Dong Yao

摘要

MgH2 is a promising solid-state hydrogen storage material; one of the limitations of its scale-application is the slow rate of hydrogen uptake and release. The addition of catalyst to improve the kinetics of MgH2 has achieved remarkable results. However, these studies require high-speed ball milling (400–500 rpm) to achieve the combination of MgH2 and catalyst, and such harsh processing conditions are difficult to achieve in industrial production. In this work, the catalyst and MgH2 were efficiently combined at lower milling speed (300 rpm) by introducing tetrahydrofuran C4H8O (THF) as an auxiliary agent. Moreover, milling with THF promotes the nano-crystallization of MgH2, which further improves its performance. Results show that THF-assisted MgH2 absorbed 6.1 wt% at 90 °C and desorbed 6.1 wt% at 275 °C, while the MgH2 milling under the same speed without THF cannot absorb hydrogen and only desorbed 3.3 wt%. It reveals that the synergistic effect produced by nano-crystallization and nano-hydrogen pump is the key mechanism of improving the performance of MgH2 after introducing THF. This work proposes a novel synergistic strategy for modifying MgH2, offering practical insights for enhancing its hydrogen storage performance under low-speed ball milling.

Graphical abstract