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

ABSTRACT

One of the main constraints for the implementation 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.

In this work, it is studied the effect of different titanium based compounds (TiB₂, LixTiO₂) on the kinetic behavior of 2LiBH₄+MgH₂ reactive hydride composite. It is found that nanometric particles of titanates (LixTiO₂) noticeably improve the first non-isothermal dehydrogenation behavior of the 2LiBH₄+MgH₂, reducing the complete H2 release time from 35 h to 2 h. Moreover, the LixTiO₂ addition improves the isothermal hydrogenation/dehydrogenation kinetic behavior. The information gained by advanced techniques such as transmission electron microscopy and Raman spectroscopy, among others, help us to elucidate that the addition of LixTiO₂ to 2LiBH₄+MgH₂ allows the hydrogen uptake/release via a novel and reversible mechanism.

Keywords
Hydrogen; Reactive hydride composites; Titanium dioxide; Titanates; Kinetics