Reactivity of hydrogen and ternary nitrides containing lithium and 13 group elements

Ternary nitrides for hydrogen storage: Li–B–N, Li–Al–N and Li–Ga–N systems

“…6). Interestingly, the results obtained for Li-B-N corroborate those for hydrogenation of the known Li 3 BN 2 ternary nitride [27,29]. Pinkerton et al [29] synthesized a new quaternary hydride by reacting LiNH 2 and LiBH 4 in a 2:1 molar ratio.…”

“…The hydrogen storage capacities obtained for Li-Al-N in this study are remarkable; for the first time, we observe hydrogen uptake by a pristine ternary nitride of Li and Al that was prepared from the binary nitrides of the elements. A previous study reported no hydrogen uptake by the known ternary nitride Li 3 AlN 2 synthesized from Li 3 N and AlN [27]. However, Xiong et al [28] reported that Li 3 AlN 2 reversibly stored 5 wt.% hydrogen.…”

“…To the best of our knowledge, there exist only a few reports in the literature on the interaction of hydrogen with ternary nitrides [26][27][28]. Nakamori et al [26] investigated mixtures of Li 3 N and Mg 3 N 2 prepared by heating at 560-820 • C in 1 bar nitrogen.…”

“…At 250 • C and 350 bar H 2 the LiMgN-type structures formed were difficult to hydrogenate, although the 5:1 mixture of Li 3 N and Mg 3 N 2 that was annealed at 560 • C underwent hydrogenation. In another study, Yamane et al [27] synthesized Li 3 XN 2 (where X = B, Al or Ga) by solid-state reaction of Li 3 N and XN at 700-800 • C. At 300 • C and 100 bar H 2 , Li 3 GaN 2 absorbed 3.4 wt.% hydrogen while Li 3 BN 2 and Li 3 AlN 2 showed no hydrogen uptake. More recently, Xiong et al [28] reported reversible 5 wt.% hydrogen absorption at 50-500 • C and 80 bar H 2 by Li 3 AlN 2 that was generated from the reaction between LiNH 2 and LiAlH 4 .…”

Reversible Hydrogen Storage by a Li–Al–N–H Complex

“…It should be noted that in a previous investigation by Yamane et al the hydrogenation of Li 3 AlN 2 at temperatures up to 300°C under 100 bar of H 2 was not observed. [31] To understand the phase transitions which occur during the hydrogenation of Li 3 AlN 2 , partially hydrogenated (at 200°C and 280°C), fully hydrogenated Li 3 AlN 2 samples were collected for XRD and NMR measurements. As shown in Figure 6b, no significant change in the XRD pattern was observed after Li 3 AlN 2 was hydrogenated at 200°C despite the slight broadening of the diffraction peaks.…”