Zn2TiO4 synthesized via solid-state method and its effects on dehydrogenation properties of LiAlH4.
In: International Journal of Hydrogen Energy, Jg. 50 (2024-01-10), S. 484-494
Online
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Zugriff:
Lithium alanate (LiAlH 4) has high gravimetric capacity but its practical application is still severely constrained by poor reversibility and sluggish kinetics. In this study, the dehydrogenation behaviour of LiAlH 4 was modified with the inclusion of Zn 2 TiO 4. The initial temperature for the dehydrogenation of LiAlH 4 was downshifted to 111 °C (first dehydrogenation) and 151 °C (second dehydrogenation) with the inclusion of 10 wt% Zn 2 TiO 4. The as-milled LiAlH 4 released only 0.1 wt% H 2 while the LiAlH 4 –10 wt% Zn 2 TiO 4 sample released 3.6 wt% H 2 in 60 min at 90 °C which is 36 times faster than undoped LiAlH 4. The dehydrogenation activation energies for the first two dehydrogenation process was also reduced by 24.1 and 21.0% than as-milled LiAlH 4. The X-ray diffraction analysis revealed that the Zn 2 TiO 4 reacts with LiAlH 4 and the formed Al–Ti and Ti–Zn during the dehydrogenation leading to the superior dehydrogenation behaviour of LiAlH 4. • Zn 2 TiO 4 was successful prepared via a solid-state method. • Zn 2 TiO 4 additive decrease the onset desorption temperature of LiAlH 4. • The addition of Zn 2 TiO 4 also enhanced the desorption kinetics of LiAlH 4. • The E A for the two-dehydrogenation stages of Zn 2 TiO 4 -doped LiAlH 4 was reduced. • The new active species of Al–Ti and Ti–Zn play a synergistic role. [ABSTRACT FROM AUTHOR]
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Zn2TiO4 synthesized via solid-state method and its effects on dehydrogenation properties of LiAlH4.
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Autor/in / Beteiligte Person: | Ali, N.A. ; Nasef, M.M. ; Jalil, A.A. ; Ismail, M. |
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Zeitschrift: | International Journal of Hydrogen Energy, Jg. 50 (2024-01-10), S. 484-494 |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 0360-3199 (print) |
DOI: | 10.1016/j.ijhydene.2023.07.249 |
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