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<p>This study prepared Mg–Ni/AC solid-state hydrogen storage materials with excellent hydrogen absorption/desorption kinetics via high-energy ball milling. Through characterization of the material’s microstructure and testing of hydrogen storage performance, the results show that the sample milled for 2&#xa0;h has the lowest hydrogen desorption activation energy of 82.14&#xa0;kJ/mol. At 373&#xa0;K, this sample can absorb 4.41&#xa0;wt% H<sub>2</sub> within 60&#xa0;min, whereas pure Mg does not absorb hydrogen at this temperature. Hydrogen desorption starts around 503&#xa0;K, which is 115&#xa0;K lower than the initial desorption temperature of pure Mg. The enhancement of the material’s hydrogen storage performance is mainly attributed to the combined effects of ball milling and Ni/AC. As the milling time increases, the particle size decreases, while the number of Ni/AC active sites on the sample surface decreases. The particle size significantly impacts hydrogen absorption kinetics, while Ni/AC affects both hydrogen absorption and desorption kinetics.</p> Graphical abstract <p></p>

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Preparation of Ni/activated carbon-catalyzed Mg-based solid-state hydrogen storage materials with enhanced hydrogen storage properties

  • 期刊论文

  • 发表日期：

    2025年2月7日

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  • Yuping Chen,
  • Xiaolan Cai,
  • Changjiang Yang,
  • Huangkai Zhou,
  • Junhao Tan,
  • Mingjun Cheng

摘要

This study prepared Mg–Ni/AC solid-state hydrogen storage materials with excellent hydrogen absorption/desorption kinetics via high-energy ball milling. Through characterization of the material’s microstructure and testing of hydrogen storage performance, the results show that the sample milled for 2 h has the lowest hydrogen desorption activation energy of 82.14 kJ/mol. At 373 K, this sample can absorb 4.41 wt% H2 within 60 min, whereas pure Mg does not absorb hydrogen at this temperature. Hydrogen desorption starts around 503 K, which is 115 K lower than the initial desorption temperature of pure Mg. The enhancement of the material’s hydrogen storage performance is mainly attributed to the combined effects of ball milling and Ni/AC. As the milling time increases, the particle size decreases, while the number of Ni/AC active sites on the sample surface decreases. The particle size significantly impacts hydrogen absorption kinetics, while Ni/AC affects both hydrogen absorption and desorption kinetics.

Graphical abstract