Ould-Amara Salem, Granier Dominique, Chiriac Rodica, Toche François, Yot Pascal G, Demirci Umit B
IEM (Institut Europeen des Membranes), UMR5635 (CNRS, ENSCM, UM), Universite de Montpellier, Place Eugene Bataillon, CC047, F-34095 Montpellier, France.
ICGM (Institut Charles Gerhardt Montpellier), UMR 5253 (CNRS UM ENSCM), Université de Montpellier, CC 15005, Place Eugène Bataillon, F-34095 Montpellier cedex 05, France.
Materials (Basel). 2017 Jul 5;10(7):750. doi: 10.3390/ma10070750.
Boron- and nitrogen-based materials have shown to be attractive for solid-state chemical hydrogen storage owing to gravimetric hydrogen densities higher than 10 wt% H. Herein, we report a new derivative of hydrazine borane N₂H₄BH₃, namely lithium hydrazinidoborane ammoniate LiN₂H₃BH₃·0.25NH₃. It is easily obtained in ambient conditions by ball-milling N₂H₄BH₃ and lithium amide LiNH₂ taken in equimolar amounts. Both compounds react without loss of any H atoms. The molecular and crystallographic structures of our new compound have been confirmed by NMR/FTIR spectroscopy and powder X-ray diffraction. The complexation of the entity LiN₂H₃BH₃ by some NH₃ has been also established by thermogravimetric and calorimetric analyses. In our conditions, LiN₂H₃BH₃·0.25NH₃ has been shown to be able to release H₂ at temperatures lower than the parent N₂H₄BH₃ or the counterpart LiN₂H₃BH₃. It also liberates non-negligible amounts of NH₃ at temperatures lower than 100 °C. This is actually quite detrimental for chemical H storage, but alternatively LiN₂H₃BH₃·0.25NH₃ might be seen as a potential NH₃ carrier.
硼基和氮基材料因其高于10 wt% H的氢重量密度而在固态化学储氢方面颇具吸引力。在此，我们报道了一种硼氢化肼N₂H₄BH₃的新衍生物，即氨合肼基硼氢化锂LiN₂H₃BH₃·0.25NH₃。通过在环境条件下对等摩尔量的N₂H₄BH₃和氨基锂LiNH₂进行球磨可轻松制得。两种化合物反应时没有任何氢原子损失。我们新化合物的分子结构和晶体结构已通过核磁共振/傅里叶变换红外光谱和粉末X射线衍射得到证实。通过热重分析和量热分析也确定了LiN₂H₃BH₃与一些NH₃的络合作用。在我们的条件下，已证明LiN₂H₃BH₃·0.25NH₃能够在低于母体N₂H₄BH₃或对应物LiN₂H₃BH₃的温度下释放H₂。它在低于100°C的温度下也会释放出不可忽略量的NH₃。这实际上对化学储氢相当不利，但LiN₂H₃BH₃·0.25NH₃也可被视为一种潜在的NH₃载体。
