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One of the main constraints for the application of hydrogen as energy carrier is the lack of an efficient and safe hydrogen storage system. Hydrogen storage in solid state through hydride compounds formation is a potential alternative to address this problem [1]. The Li-RHC system (2LiH+MgB2/2LiBH4+MgH2) presents potential characteristics as hydrogen storage medium for practical purposes. It has high theoretical gravimetric capacity (11.4 wt. % H). However, due to kinetic constrains, this material takes long times for the hydrogenation-dehydrogenation process even at relative high temperature [2]. The addition of materials composed of transition metals (TiF3, TiCl, etc) has shown to have the potential to decrease the times for the dynamic processes of H2 absorption and release. Nonetheless, the high cost of these additives precludes their use at large scale. Previous works have reported that the addition of 1% mol of TiO2 to the dehydrided system (2LiH+MgB2) improves its kinetic properties, although its mechanism is not understood yet. To shed light on the mechanism of TiO2 on the reactive hydride composite, the effect of different titanium based compounds (TiB2, TiO2, Li0.5TiO2) on the dehydrogenation kinetic behavior of hydrided Li-RHC (2LiBH4+MgH2) are investigated in this work. It is found that nanometric particles of LixTiO2, (x=0.5 and 1) noticeably improve the dehydrogenation process of the 2LiBH4+MgH2, reducing the complete H2 release time from 35 hours to < 2 hours. The information gained by advanced techniques such as transmission electron microscopy and Raman spectroscopy help us to elucidate that the LixTiO2 compounds improve the dehydrogenation kinetic behavior by avoiding the formation of stable and amorphous Li2B12H12 compound.

Estudio y caracterización del efecto de compuestos con titanio sobre el sistema hidruro Li-B-Mg-H con alta capacidad de almacenamiento de hidrógeno