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学科主题物理化学
Investigations on multi-component amidoboranes for hydrogen storag
Xiong ZT(熊智涛); Wu GT(吴国涛); Cai YS(蔡永胜); Chen P(陈萍)
会议文集2011 MRS Spring Meeting Program and Exhibit Guide
会议名称2011 MRS Spring Meeting
会议日期2011-4-25
2011
会议地点旧金山
页码167-0
出版者待补充
出版地待补充
合作性质分会特邀报告
部门归属1901
主办者MRS
英文摘要Hydrogen storage materials of high gravimetric and volumetric energy density are highly demanded for the implementation of fuel cell technology into automobile industry. To achieve such a material research efforts are currently concentrated on complex hydrides that comprise light elements and possess high hydrogen content. Holding a hydrogen capacity of 19.6 wt% ammonia borane (NH3BH3, AB in short) recently received extensive investigations. Simply heating AB to release its hydrogen suffers from several drawbacks such as high operation temperature, volatile side-products, and various modifications have been made on this material. One of approaches is through reacting AB with alkali or alkaline earth metal hydrides to convert it to amidoboranes (M(NH2BH3)n). Both mechanical ball milling and wet-chemical method were employed for the chemical synthesis. In this case, attraction between the protonic H in NH3 in AB and hydridic H in hydride may drive the interaction. As a consequence one of Hs in NH3 is replaced by alkali or alkaline earth element, i.e., MHn + nNH3BH3  M(NH2BH3)n + nH2. Distinct from parent AB, a molecular crystal stabilized by a network of dihydrogen bonding, the resulting amidoborane exhibits ionic characters, as well as altered dehydrogenation properties. For example, alkali metal amidoboranes, LiNH2BH3 and NaNH2BH3, are capably of evolving 10.9 wt% and 7.5 wt% hydrogen at 91 C, respectively, with no measurable borazine formation. Ca(NH2BH3)2 totally evolves 4 equiv. H2 in a temperature range of 120-250 C. Sr(NH2BH3)2 starts to evolve hydrogen at temperature as low as 60 C and vigorous hydrogen emission was observed around 80 C.; Hydrogen storage materials of high gravimetric and volumetric energy density are highly demanded for the implementation of fuel cell technology into automobile industry. To achieve such a material research efforts are currently concentrated on complex hydrides that comprise light elements and possess high hydrogen content. Holding a hydrogen capacity of 19.6 wt% ammonia borane (NH3BH3, AB in short) recently received extensive investigations. Simply heating AB to release its hydrogen suffers from several drawbacks such as high operation temperature, volatile side-products, and various modifications have been made on this material. One of approaches is through reacting AB with alkali or alkaline earth metal hydrides to convert it to amidoboranes (M(NH2BH3)n). Both mechanical ball milling and wet-chemical method were employed for the chemical synthesis. In this case, attraction between the protonic H in NH3 in AB and hydridic H in hydride may drive the interaction. As a consequence one of Hs in NH3 is replaced by alkali or alkaline earth element, i.e., MHn + nNH3BH3  M(NH2BH3)n + nH2. Distinct from parent AB, a molecular crystal stabilized by a network of dihydrogen bonding, the resulting amidoborane exhibits ionic characters, as well as altered dehydrogenation properties. For example, alkali metal amidoboranes, LiNH2BH3 and NaNH2BH3, are capably of evolving 10.9 wt% and 7.5 wt% hydrogen at 91 C, respectively, with no measurable borazine formation. Ca(NH2BH3)2 totally evolves 4 equiv. H2 in a temperature range of 120-250 C. Sr(NH2BH3)2 starts to evolve hydrogen at temperature as low as 60 C and vigorous hydrogen emission was observed around 80 C.
文献类型会议论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/115942
专题中国科学院大连化学物理研究所
通讯作者Chen P(陈萍)
推荐引用方式
GB/T 7714
Xiong ZT,Wu GT,Cai YS,et al. Investigations on multi-component amidoboranes for hydrogen storag[C]. 待补充:待补充,2011:167-0.
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