Ultrafast Reaction between Li3N and LiNH2 To Prepare the Effective Hydrogen Storage Material Li2NH

Li 2 NH is a promising candidate for hydrogen storage. However, its performance for hydrogen absorption is strongly dependent on its preparation method. In this paper, we report that an ultrafast solid reaction between Li 3 N and LiNH 2 provides a new synthesis approach to an effective Li 2 NH material, which can reversibly store 6.8 wt % hydrogen with fast kinetics and excellent stability. In contrast, Li 2 NH prepared via the conventional LiNH 2 decomposition method absorbs less than 2 wt % hydrogen in 500 min. Scanning electron microscopy (SEM) and BET measurements demonstrated that the poor performance of Li 2 NH prepared via the conventional decomposition method is caused by sintering. In addition, the hydrogen capacity of Li 2 NH, which was prepared via the reaction between LiH and LiNH 2, reached a value of only about 4 wt % after 500 min.