Abstract
Lithium aluminum hydride (LiAlH4) is an interesting high capacity hydrogen storage material with fast hydrogen release kinetics when mechanically activated with additives. Herein, we report on a novel approach to produce nanoscale LiAlH4 via a bottom-up synthesis. Upon further coating of these nanoparticles with Ti, the composite nanomaterial was found to decompose at 120 °C in one single and extremely sharp exothermic event with instant hydrogen release. This finding implies a significant thermodynamic alteration of the hydrogen properties of LiAlH4 induced by the synergetic effects of the Ti catalytic coating and nanosizing effects. Ultimately, the decomposition path of LiAlH4 was changed to LiAlH4 → Al + LiH + 3/2H2.
Highlights
Hydrogen holds enormous potential to be the ultimate energy carrier of the future [1,2,3,4,5]
The nanosynthesis of LiAlH4 can be achieved via common solvent evaporation methods [30]
For hydride materials which are highly oxidized by water, the synthesis should be performed under non-aqueous environments
Summary
Hydrogen holds enormous potential to be the ultimate energy carrier of the future [1,2,3,4,5]. The lack of an effective method for storing hydrogen with high density currently restrains its widespread utilization. Solid state hydride materials offer promising possibilities to deliver high capacity, safe, and compact hydrogen storage systems [5,6]. No material satisfies all the requirements for practical mobile application [3]. LiAlH4 is one of the most promising and interesting candidates owing to its competitive total hydrogen capacity as well as its low temperature for hydrogen release with fast kinetics [3,6].
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