Hydrogen storage properties of the Zintl phase alloy SrAl2 doped with TiF3

Abstract In this paper, the structural and hydrogenation characteristics of TiF 3 -doped Zintl phase alloy SrAl 2 were studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and hydrogenation measurements. The results show that the hydrogenation kinetics of the Zintl phase alloy SrAl 2 is improved greatly after doping with TiF 3 . By adjusting the doping amount and ball milling time, the optimal doping conditions were obtained. The catalytic mechanism of TiF 3 for the hydrogenation of SrAl 2 was also investigated. SrAl 2 does not react with TiF 3 during the ball milling process. However, it reacts with TiF 3 to form SrAl 2 H 2 , SrF 2 , SrAl 4 and Ti during the hydrogenation process, among which Ti plays an important role in the hydrogenation kinetics of SrAl 2 .