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学科主题: 物理化学
题名: Improved Dehydrogenation Properties of Calcium Borohydride Combined with Alkaline-Earth Metal Amides
作者: Chu, Hailiang1;  Wu, Guotao1;  Zhang, Yao1;  Xiong, Zhitao1;  Guo, Jianping1;  He, Teng1;  Chen, Ping1
通讯作者: 张耀 ;  熊智涛
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2011-09-15
DOI: 10.1021/jp2052695
卷: 115, 期:36, 页:18035-18041
收录类别: SCI
文章类型: Article
部门归属: 19
项目归属: 1901
产权排名: 1,1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
摘要: Improved Dehydrogenation Properties of Calcium Borohydride Combined with Alkaline-Earth Metal Amides
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Promotion of dehydrogenation based on the interaction of [BH4](-) and [NH2](-) sources has been demonstrated to be one of the most effective approaches in developing an advanced borohydride/amide hydrogen storage combined system. The Ca(BH4)(2)-2Mg(NH2)(2) and Ca(BH4)(2)-2Ca(NH2)(2) composites are thereby synthesized in the present work. It is found that the binary combined systems exhibit an onset dehydrogenation temperature of similar to 220 degrees C, which is similar to 100 degrees C lower than that of pristine Ca(BH4)(2). The hydrogen release measurements for Ca(BH4)(2)-2Mg(NH2)(2) and Ca(BH4)(2)-2Ca(NH2)(2) samples below 480 degrees C show desorption amounts of 8.3 and 6.8 wt % hydrogen, respectively. The dehydrogenation of both samples is accompanied by an ammonia emission of <1.4 mol %. The characterizations such as X-ray diffraction and nuclear magnetic resonance on the postdehydrogenated samples indicate that the dehydrogenation reactions are in the pathways of Ca(BH4)(2) + 2 Mg(NH2)(2) -> 1/3 [Ca3Mg6(BN2)(6)] + 8 H-2 and Ca(BH4)(2) + 2 Ca(NH2)(2) -> 1/3 Ca-9(BN2)(6) + 8 H-2, respectively. Compared with pristine Ca(BH4)(2) sample, both possess lower activation energy for dehydrogenation. Further investigation reveals that the interaction of B-H and N-H may be one of main driving forces for dehydrogenation of borohydride/amide combined system.
关键词[WOS]: N-H SYSTEM ;  HYDROGEN STORAGE PROPERTIES ;  MAGNESIUM BOROHYDRIDE ;  CRYSTAL-STRUCTURES ;  COMPLEX HYDRIDE ;  DESORPTION ;  LIBH4 ;  REVERSIBILITY ;  CA(BH4)(2) ;  MG(BH4)(2)
语种: 英语
WOS记录号: WOS:000294701600054
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/115419
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Chu, Hailiang,Wu, Guotao,Zhang, Yao,et al. Improved Dehydrogenation Properties of Calcium Borohydride Combined with Alkaline-Earth Metal Amides[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2011,115(36):18035-18041.
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