LiBH_4/Li_3AlH_6复合物的放氢性能与机理  

Dehydrogenation Properties and Mechanism of LiBH_4/Li_3AlH_6 Composite

作　　者：吴晓诚[1] 王新华[1] 李寿权[1] 葛红卫[1] 陈立新[1] 严密[1,2] 陈长聘[1] 

机构地区：[1]浙江大学,浙江杭州310027 [2]硅材料国家重点实验室,浙江杭州310027

出　　处：《稀有金属材料与工程》2012年第8期1405-1408,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51171168;50671094);浙江省自然科学基金(Y4110147)

摘　　要：采用机械球磨法制备LiBH4/Li3AlH6复合体系,通过TG/DSC/MS、XRD等方法对其储氢性能及机理进行研究,并对其放氢反应激活能进行计算。结果表明,LiBH4-Li3AlH6复合体系从室温加热到500℃条件下发生3步放氢反应:首先,Li3AlH6分解生成Al并放出氢;然后部分生成的Al与LiBH4发生反应放出氢气;最后,剩余的Al与LiH反应放出氢气。复合体系总的放氢量达到8.5%(质量分数,下同),完全放氢后的复合物在8MPa和400℃条件下最大吸氢量达到4.9%。并对LiBH4-Li3AlH6复合体系放氢过程机理进行了分析。LiBH 4 /Li 3 AlH 6 hydrogen storage composite was prepared by ball-milling,and its hydrogen storage properties and mechanism were studied by TG/DSC/MS and XRD analysis.The activation energies of the dehydrogenation reactions were calculated.The experimental results show that LiBH 4-Li 3 AlH 6 composite dehydrogenates shows three reactions：（1） Li 3 AlH 6 decomposes with hydrogen desorption and formation of Al;（2） part of Al reacts with LBH 4 with hydrogen desorption;（3） Al reacts with LiH.The total hydrogen desorption capacity reaches 8.5 wt%.And the mechanism of hydrogen desorption process of LiBH 4-Li 3 AlH 6 composite was discussed.

关 键 词：储氢材料 储氢性能 配位氢化物 激活能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]