LiBH4-(NH4)3AlF6的脱氢性能  

Dehydrogenation performance of LiBH_4-(NH4)_3AlF_6

作　　者：范明慧 徐芬[1] 孙立贤[1] 吴燚鹏 于芳 FAN Ming-hui;XU Fen;SUN Li-xian;WU Yi-peng;YU Fang(Guangxi Key Laboratory of Information Materials,School of Materials Science and Engineering,Guilin University of Electronic Technology,Guilin Guangxi 541004,China)

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西信息材料重点实验室,广西桂林541004

出　　处：《电源技术》2018年第10期1516-1519,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金项目(51671062和U1501242);广西材料科学与技术创新团队基金(2012GXNSFGA06002);广西科技计划项目(AD17195073);广西科技重大专项(AA17202030-1);广西信息材料重点实验室基金(161002-Z,161002-K,161003-K和151002-K).

摘　　要：借助高能机械球磨的方法在LiBH_4中掺杂(NH4)_3AlF_6,制备了LiBH_4-(NH4)_3AlF_6复合材料,并采用PCT、TG-MS、FTIR等手段对所制备的复合材料的脱氢进行了研究。该复合材料的脱氢性能研究结果表明:(NH4)_3AlF_6可有效改善LiBH_4的脱氢性能,使得10LiBH_4-(NH4)_3AlF_6复合材料的起始脱氢温度降至65℃,且300℃时的脱氢量达8.5%(质量分数)。利用TG-MS联用技术对所释放的气体成分进行了分析,发现复合材料放出氢气的同时伴随着杂质气体(硼烷和氨气)的放出。研究证实,同时加入LiH和OH-CNTs可有效控制杂质气体的释放,提高所放出的H2的纯度。LiBH4-(NH4)3AlF6 compositeswere prepared by doping(NH4)3AlF6 into LiBH4 with the help of high energy mechanical ball-milling method.The performances of dehydrogenation of the composites were then characterized by a series of studies such as PCT,TG-MS and FTIR.The studies show that doping(NH4)3AlF6 can effectively improve dehydrogenation performance of LiBH4 by decreasing the initial dehydrogenation temperature to 65℃and increasing the amount of hydrogen released at 300℃to 8.5%.Making use of TG-MS technique,the component analysis of released gas by heating the LiBH4-(NH4)3AlF6 composite indicated that impurities(borane and ammonia)were released during the dehydrogenation process.Meanwhile,the research results also indicate that the borane and ammonia can be effectively inhibited by simultaneously adding LiH and OH-CNTs.Therefore,the purity of the released hydrogen is enhanced.

关 键 词：储氢材料 LiBH4 (NH4)3AlF6 TG-MS 红外分析 

分 类 号：TM911[电气工程—电力电子与电力传动]