CeF_(3)改性2LiNH_(2)-MgH_(2)-0.1LiBH_(4)材料的储氢性能  

Hydrogen Storage Properties of 2LiNH_(2)-MgH_(2)-0.1LiBH_(4) Modified with Addition of CeF_(3)

作　　者：王媛媛[1] 孙焕军 吴宇浩 刘海镇 李寿权[1] 葛红卫[1] 王新华[1] WANG Yuanyuan;SUN Huanjun;WU Yuhao;LIU Haizhen;LI Shouquan;GE Hongwei;WANG Xinhua(State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China;College of Physical Science and Technology,Guangxi University,Nanning 530004,China)

机构地区：[1]浙江大学材料科学与工程学院/硅材料国家重点实验室,浙江杭州310027 [2]广西大学物理科学技术学院,广西南宁530004

出　　处：《材料科学与工程学报》2021年第6期884-888,947,共6页Journal of Materials Science and Engineering

基　　金：国家重点研发计划资助项目(2019YFB1505105);国家自然科学基金资助项目(51971199,51771171)。

摘　　要：采用球磨法制备了CeF_(3)改性2LiNH_(2)-MgH_(2)-0.1LiBH_(4)复合储氢材料(以下简称LiMgBNH材料),对其吸放氢性能进行了研究。结果表明,在LiMgBNH中添加6wt%的CeF_(3)后样品起始放氢温度约为110℃,比原始样品降低了约10℃。CeF_(3)改性的样品在放氢过程中,出现了3个放氢峰,其中第一个放氢峰的峰值温度比未添加CeF_(3)样品降低了约23℃,并且在140℃下CeF_(3)改性的样品线性放氢区域的放氢速度约为原始样品的3.1倍。在温度低于180℃时,CeF_(3)对LiMgBNH材料放氢性能的改善作用显著。当温度高于180℃,由于Li_(4)(BH_(4))(NH_(2))3的形成对LiMgBNH材料放氢性能的改善作用显著,CeF_(3)的作用减弱。CeF_(3)改性LiMgBNH材料具有较为优异的循环吸放氢性能。分析了CeF_(3)在LiMgBNH体系放氢过程中的作用机理。A composite of 2 LiNH_(2)-MgH_(2)-0.1 LiBH_(4)(hereafter denoted as LiMgBNH)modified by CeF_(3)was prepared by ball milling,and its hydrogen storage properties were investigated.The results show that the starting hydrogen desorption temperature of LiMgBNH with addition of 6 wt%CeF_(3)is around 110℃,which is about 10℃lower than the sample without CeF_(3).Three hydrogen desorption peaks appear in CeF_(3)modified LiMgBNH sample.The first peak temperature is 23℃lower than that of the unmodified sample.Under conditions of 140℃,the hydrogen releasing rate of CeF_(3)modified LiMgBNH is around 3.1 times higher than that of the unmodified sample.When the temperature is lower than 180℃,CeF_(3)shows remarkable improvement for the hydrogen desorption of LiMgBNH sample.However,when the temperature is higher than 180℃,the effect of CeF_(3)is comparably decreased because of the formation of Li_(4)(BH_(4))(NH_(2))3 which shows remarkable improvement for the hydrogen desorption properties.The composite of CeF_(3)modified LiMgBNH also shows good hydrogen absorption/desorption cyclic properties.The mechanism of CeF_(3)was also discussed.

关 键 词：储氢材料 氟化铈 氨基锂 硼氢化锂 放氢性能 

分 类 号：TB34[一般工业技术—材料科学与工程] TG146.2[金属学及工艺—金属材料]