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.
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.
作者
屠国平
何剑灵
肖学章
陈立新
任钱江
杜锡勇
骆明儿
TU Guoping HE Jianling XIAO Xuezhang CHEN Lixin REN Qianjiang DU Xiyong LUO Minger(School of Materials Science and Engineering, Zhefiang University, Hangzhou 310027, China Shaoxing Testing Institute of Quality Technical Supervision, Shaoxing 312071, China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第10期1757-1762,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:51471151
51571179
51671173)资助~~
关键词
储氢材料
硼氢化锂
协同效应
Hydrogen storage material
LiBH4
Synergetic effect
