Synthesis and Stability of Hydrogen Storage Material Aluminum Hydride

Abstract

Aluminum hydride (AlH3) is a binary metal hydride with a mass hydrogen density of more than 10% and bulk hydrogen density of 148 kg H2/m3. Pure aluminum hydride can easily release hydrogen when heated. Due to the high hydrogen density and low decomposition temperature, aluminum hydride has become one of the most promising hydrogen storage media for wide applications, including fuel cell, reducing agents, and rocket fuel additive. Compared with aluminum powder, AlH3 has a higher energy density, which can significantly reduce the ignition temperature and produce H2 fuel in the combustion process, thus reducing the relative mass of combustion products. In this paper, the research progress about the structure, synthesis, and stability of aluminum hydride in recent decades is reviewed. We also put forward the challenges for application of AlH3 and outlook the possible opportunity for AlH3 in the future.

Atomic insights into combustion mechanism of nano‐aluminum hydride

“…Among metal hydrides, the light metal hydrides represented by aluminum hydride (AlH 3 ), magnesium hydride (MgH 2 ), and lithium hydride (LiH) have higher hydrogen content. [17][18][19][20][21][22] These light metal hydrides have been widely used in the energy field especially in energetic materials due to their superior hydrogen storage density and high reactivity. 23,24 AlH 3 is a covalently bonds, metastable solid at room temperature with a large gravimetric and volumetric hydrogen capacity (10.1 wt% and 149 kg/m 3 , respectively), which is twice as much as the value of liquid hydrogen (0.070 g/mL); it has the rapid low-temperature decomposition kinetics (below 100 C).…”

“…Among metal hydrides, the light metal hydrides represented by aluminum hydride (AlH 3 ), magnesium hydride (MgH 2 ), and lithium hydride (LiH) have higher hydrogen content 17‐22 . These light metal hydrides have been widely used in the energy field especially in energetic materials due to their superior hydrogen storage density and high reactivity 23,24 .…”

Anodizing of Hydrogenated Titanium and Zirconium Films

“…Metal hydrides have being studied intensively for a long time, both from a fundamental point of view [29][30][31][32][33][34][35][36][37][38] and for various applications. They can be used, for example, for storing hydrogen, as shown in the case of Al [39][40][41], Ti [42,43], Zr [44][45][46], and alloys [47]. In addition, hydrogenated metals are currently used in the manufacturing of catalytic [48] and photocatalytic materials [49][50][51], super capacitors [52], microwave absorbers [53], and electronic products [54].…”

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

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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.

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“…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 3/2H…”