Ni-based catalyst assisted by MnO to boost the hydrogen storage performance of magnesium hydride

Magnesium hydride (MgH2) stands out as a promising solid-state material for high-density hydrogen storage, offering enormous potential for applications in hydrogen transportation and storage. However, the stable thermodynamics and sluggish kinetics of dehydrogenation/hydrogenation of MgH2 impede its...

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Bibliographic Details
Published in:International journal of hydrogen energy 2024-02, Vol.55, p.512-520
Main Authors: Yin, Chengwang, Qiu, Shujun, Xia, Yongpeng, Xu, Fen, Sun, Lixian, Chu, Hailiang
Format: Article
Language:English
Subjects:
Hydrogen storage
MgH2
MnO
Synergistic catalysis
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Summary:Magnesium hydride (MgH2) stands out as a promising solid-state material for high-density hydrogen storage, offering enormous potential for applications in hydrogen transportation and storage. However, the stable thermodynamics and sluggish kinetics of dehydrogenation/hydrogenation of MgH2 impede its practical use in on-board hydrogen storage. In this study, the nanocomposite of nickel/manganese oxide (Ni/MnO) was successfully synthesized through the hydrogenation of nickel-manganese two-dimensional layered double hydroxide (NiMn-LDH) and then introduced into MgH2 by ball milling to form BM-MgH2-Ni/MnO composite. Notably, BM-MgH2-Ni/MnO-10 displayed excellent hydrogen absorption/dehydrogenation properties. For example, its onset hydrogen release temperature was remarkably reduced to 175.6 °C, 84 °C lower than that of BM-MgH2. At a temperature of 250 °C, it could desorb about 6.2 wt% of H2 within 60 min. The fully dehydrogenated product could absorb 5.5 wt% of H2 within 10 min at 150 °C. Moreover, BM-MgH2-Ni/MnO-10 exhibited excellent cycling performance. Throughout the cycling process, the in-situ formation of Mg2Ni/Mg2NiH4 and metal Mn was detected, leading to a synergistic effect that significantly enhanced the hydrogen storage capability of MgH2. This study presents innovative concepts for designing active catalysts to enhance the kinetics of de-/hydrogenation reactions of MgH2. [Display omitted] •Ni/MnO nanocomposites were successfully synthesized.•Ni/MnO nanocomposites obviously improved the hydrogen storage performance of MgH2.•Synergistic catalysis of in situ-formed Mg2Ni, Mg0·9Mn0·1O, and Mn was proposed.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2023.11.213