Synergetic effects of K, Ti and F on the hydrogen storage properties of the Li[sbnd]N[sbnd]H system.

In this paper, the hydrogen storage properties of the LiNH 2 LiH system doped with K 2 TiF 6 were investigated and discussed. Interestingly, the hydrogen storage properties are significantly enhanced by introducing K 2 TiF 6 into the LiNH 2 LiH system. By doping 5 mol% K 2 TiF 6 in the LiNH 2 LiH system, we obtain the hydrogen desorption peak temperature (233 °C) at a heating rate of 10 °C min −1 , which is approximately 66 °C lower than that of the pristine LiNH 2 LiH system. Moreover, the system begins to desorb H 2 at 75 °C, which is approximately 124 °C lower than in the pristine LiNH 2 LiH system. The isothermal desorption kinetics at 250 °C and 300 °C clearly reflects the dramatically improved kinetic properties. Additionally, the reversibility of the LiNH 2 LiH system can be drastically enhanced by adding K 2 TiF 6 . We propose that the dehydrogenation property of the K 2 TiF 6 -doped LiNH 2 LiH sample is improved by the synergetic effects of K, Ti and F. [ABSTRACT FROM AUTHOR]