Superior Dehydrogenation Performance of α‐AlH₃ Catalyzed by Li₃N: Realizing 8.0 wt.% Capacity at 100 °C

Abstract

kg m −3 ), moderate dehydrogenation temperature (150-180 °C), and rich reserves of corresponding raw materials. [10][11][12] Aluminum hydride releases hydrogen by the following chemical equation. [13] AlH Al 3/2H3 2The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.202107983.

Recent Development in Nanoconfined Hydrides for Energy Storage

“…The onset of dehydrogenation was conveniently reduced to 66.8 °C (0.95AlH3-0.05Li3N), thus approaching an operating regime suitable for FCEs. The beneficial role of lithium amide was confirmed by the apparent Ea which is strongly reduced (Figure 19c) [206].…”

“…In bulk, AlH 3 decomposes at 100-150 • C and the kinetics are reasonably fast, but the high H 2 pressure required to achieve reversibility (10 GPa, 600 • C, 24 h; 10 GPa at 25 • C or 6 GPa at 300-380 • C by other accounts are all very high pressures) remains a hard obstacle to overcome (Table 12). Even so, mitigation of this drawback has been attempted by means of nanoconfinement [40,44,51,109,125,203,206,216,[226][227][228][229][230][231][232][233]. Some results are pure theoretical results concerning the catalytic activity of nano-AlH 3 [229] in the decomposition of 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane, with simulated evolution of Al-clusters during the reaction [228], or decomposition of CH 3 NO 2 /nano-AlH 3 composite [232].…”

“…Ball milling of a light metal nitride (Li3N) with AlH3 showed that a weakening of the Al-H bond is produced as a result of the milling process (a shift in XPS maximum), and that the hydrogen capacity decreases with the Li3N fraction: 9.04 wt.% (0.95AlH3-0.05Li3N), 8.71 wt.% (0.9AlH3-0.1Li3N) and 7.85 wt.% (0.85AlH3-0.15Li3N), compared to the ball milled pure AlH3 (9.86 wt.%) (Figure 19) [206]. Figure 19b shows the isothermal dehydrogenation of (1 − x)AlH3-xLi3N (x = 0.05, 0.1, 0.15) at 100 °C, confirming a decrease in H2 wt.% with the content of Li3N.…”