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Low-temperature solid-state hydrogen storage via efficiently catalyzed MgH2

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  • Dan, Liang
  • Wang, Hui
  • Yang, Xiaobao
  • Liu, Jiangwen
  • Ouyang, Liuzhang
  • Zhu, Min

Abstract

The urgent development of safe, high-density hydrogen transport and storage technologies is crucial for renewable hydrogen energy. In the present work, a highly efficient N, Nb-doped TiO2 catalyst was synthesized using an NH3 plasma process to catalyze reversible hydrogen sorption of the high-density hydride MgH2. The catalyzed MgH2 exhibits rapid hydrogen uptake even at room temperature and dehydrogenation at a greatly decreased temperature of 175 °C. The onset dehydrogenation temperature of the catalyzed MgH2 is reduced to 155 °C with an activation energy of 57.33 kJ/mol. Theoretical calculations suggest that the modified TiO2 significantly reduces the dissociation energy barrier and the H2 dissociation energy, accelerating the combination of hydrogen atoms with Mg. The presence of N atoms could also weaken the Mg–H bonds, facilitating the decomposition of MgH2. This work demonstrates the potential of high-density solid-state hydrogen storage via catalyzed MgH2 under moderate conditions.

Suggested Citation

  • Dan, Liang & Wang, Hui & Yang, Xiaobao & Liu, Jiangwen & Ouyang, Liuzhang & Zhu, Min, 2024. "Low-temperature solid-state hydrogen storage via efficiently catalyzed MgH2," Renewable Energy, Elsevier, vol. 231(C).
    • Handle: RePEc:eee:renene:v:231:y:2024:i:c:s0960148124010772
    DOI: 10.1016/j.renene.2024.121009
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    References listed on IDEAS

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    Keywords

    Hydrogen energy; MgH2; TiO2 catalysis; N-doping; Nb-doping;
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