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

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

Renewable Energy, 2024, vol. 231, issue C

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.

Keywords: Hydrogen energy; MgH2; TiO2 catalysis; N-doping; Nb-doping (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:231:y:2024:i:c:s0960148124010772

DOI: 10.1016/j.renene.2024.121009

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