Bimetallic Ti2NbC2 MXene as an efficient catalyst for reversible hydrogen storage in magnesium hydride
Article
Article Title | Bimetallic Ti2NbC2 MXene as an efficient catalyst for reversible hydrogen storage in magnesium hydride |
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ERA Journal ID | 4828 |
Article Category | Article |
Authors | Lv, Mei-Ling, Zheng, Jia-Guang, Xia, Ao, Zhang, Qing-Bo, Ma, Zhen-Xuan, Su, Chao and Ge, Lei |
Journal Title | Rare Metals |
Number of Pages | 13 |
Year | 2025 |
Publisher | Springer |
Place of Publication | China |
ISSN | 0258-7076 |
1001-0521 | |
Digital Object Identifier (DOI) | https://doi.org/10.1007/s12598-024-03140-7 |
Web Address (URL) | https://link.springer.com/article/10.1007/s12598-024-03140-7 |
Abstract | Magnesium hydride (MgH2) was highly regarded for its substantial hydrogen storage capacity of up to 7.6 wt%, but its commercial application was hindered by the high operating temperatures and slow kinetics. In this study, the successful synthesis of the layered Ti2NbC2 has significantly enhanced the hydrogen storage performance of MgH2. MgH2 + 5 wt% Ti2NbC2 began to release hydrogen at 190 °C and started to absorb hydrogen at room temperature. At a constant temperature of 275 °C, complete hydrogen release was achieved in just 250 s, up to 6.9 wt%. At 150 °C, the absorption of hydrogen reached 6.59 wt% within 200 s, and the hydrogen absorption activation energy was reduced to 41.517 ± 3.981 kJ·mol−1, significantly improving the kinetic performance. Moreover, the composite material still exhibited excellent cyclic stability after 20 cycles at 275 °C. In the process of hydrogen de/absorption of Ti2NbC2 with MgH2, active substances Nb–H and Ti–H were generated in situ, which effectively weakened the Mg–H bond and acted as efficient “hydrogen pumps” to accelerate the re/dehydrogenation of MgH2. The unique layered structure and hydrogen affinity of Ti2NbC2 provided an effective transfer channel for hydrogen migration, which was key to the excellent hydrogen storage performance of the MgH2 + Ti2NbC2. |
Keywords | Hydrogen storage; Magnesium hydride; Bimetallic catalysts; MXene |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400406. Powder and particle technology |
340204. Inorganic green chemistry | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Jiangsu University of Science and Technology, China |
School of Engineering | |
Centre for Future Materials |
https://research.usq.edu.au/item/zwyzv/bimetallic-ti2nbc2-mxene-as-an-efficient-catalyst-for-reversible-hydrogen-storage-in-magnesium-hydride
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