Abstract
Aluminum hydride (AlH3) is a binary metal hydride with a mass hydrogen density of more than 10% and bulk hydrogen density of 148 . 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.
Highlights
Aluminum hydride (AlH3 ) has great potential applications in rocket fuel and fuel cell due to its high combustion heat and high hydrogen content [1,2,3]
The bulk hydrogen density of AlH3 is 148 kg H2 /m3, and the weight hydrogen density is more than 10%, which meets the requirements of the U.S Department of Energy (DOE) for hydrogen and energy storage materials [4,5,6,7,8,9]
Researchers are committed to breaking through the bottleneck problems in the practical application of AlH3, including improving the synthesis method [11,12,13,14], coating or doping of AlH3 [15,16,17], and providing a deep understanding of the thermodynamics and kinetics of AlH3 [18,19,20]
Summary
Aluminum hydride (AlH3 ) has great potential applications in rocket fuel and fuel cell due to its high combustion heat and high hydrogen content [1,2,3]. AlH3 has the advantages of low reaction heat and rapid hydrogen release rate. Researchers are committed to breaking through the bottleneck problems in the practical application of AlH3 , including improving the synthesis method [11,12,13,14], coating or doping of AlH3 [15,16,17], and providing a deep understanding of the thermodynamics and kinetics of AlH3 [18,19,20]. We put forward the methods to improve the stability of aluminum hydride and outlook the possible opportunities for application of AlH3 in the future. The methods to improve the stability of aluminum hydride and outlook the possible portunities for application of AlH3 in the future
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