The effects of Ti-based additives on the kinetics and reactions in LiH/MgB2 hydrogen storage system

In this work we investigated the effect of Ti, TiH2, TiB2, TiCl3, and TiF3 additives on the hydrogen de/re-sorption kinetics and reaction pathways of LiH/MgB2 mixture. From high pressure differential scanning calorimeter (HP-DSC) measurements it was found that these additives all effectively decrease the onset temperature of hydrogenation. The isothermal hydrogenation/dehydrogenation measurements suggest that Ti, TiH2, and TiB2 can significantly improve the hydrogen sorption kinetics of LiH/MgB2 mixture. The absorption kinetics of TiF3 and TiCl3 doped samples are slower than the baseline (2LiH–MgB2 without additive), but their desorption kinetics are faster than the baseline and other additives doped systems. X-ray diffraction (XRD) analysis reveals that the additive Ti in LiH/MgB2 actively participates in both hydrogenation and dehydrogenation process, which can be regarded as an effective additive of this system.