中文摘要：

制备了h-BN负载纳米NbH改性剂（NbH@h-BN）,并采用X射线衍射（XRD）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）以及X射线能谱（EDS）等测试手段对其进行表征,分析了NbH@h-BN对LiBH4放氢反应的掺杂改性作用及机理.结果表明：经NbH@h-BN掺杂改性后,LiBH4的放氢峰值温度和表观活化能分别降低至380℃和142.31kJ/mol,放氢动力学性能也得到大幅改善.分析认为：NbH@h-BN具备协同改性LiBH4的放氢性能是因为NbH@h-BN可以生成稳定的粒径为5-10nm的NbH颗粒,并且可以避免纳米NbH在掺杂改性过程和放氢过程中发生团聚,能够充分发挥纳米NbH和h-BN各自的改性作用.

英文摘要：

NbH@h-BN was prepared by mechanically milling h-BN,NbCl5 and Li H,and the samples were detected by X-ray diffraction（ XRD）, X-ray photoelectron spectroscopy（ XPS）, transmission electron microscopy（ TEM） and energy dispersive spectrometry（ EDS）. The enhancement of Nb H @ h-BN on the dehydrogenation of LiBH4 and its mechanism were investigated. The results showed that the onset dehydrogenation temperature and the apparent activation energy（ Ea） of LiBH4 were reduced to 380 ℃ and 142. 31 kJ/mol respectively after the addition of NbH @ h-BN,and the dehydrogenation kinetics of LiBH4 was improved significantly. These remarkable results are largely attributed to the nano NbH particles which were dispersed on the surface of h-BN stably.