Improved Dehydrogenation Properties of Calcium Borohydride Combined with Alkaline-Earth Metal Amides

	Improved Dehydrogenation Properties of Calcium Borohydride Combined with Alkaline-Earth Metal Amides
	Chu, Hailiang; Wu, Guotao; Zhang, Yao; Xiong, Zhitao; Guo, Jianping; He, Teng; Chen, Ping
刊名	journal of physical chemistry c
	2011-09-15
卷号	115 期号:36 页码:18035-18041
ISSN号	待补充
通讯作者	张耀 ; 熊智涛
产权排序	1,1
中文摘要	improved dehydrogenation properties of calcium borohydride combined with alkaline-earth metal amides
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.
学科主题	物理化学
WOS标题词	science & technology ; physical sciences ; technology
类目[WOS]	chemistry, physical ; nanoscience & nanotechnology ; materials science, multidisciplinary
研究领域[WOS]	chemistry ; science & technology - other topics ; materials science
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)
收录类别	SCI
语种	英语
WOS记录号	WOS:000294701600054
公开日期	2012-07-09
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/115419]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	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.
APA	Chu, Hailiang.,Wu, Guotao.,Zhang, Yao.,Xiong, Zhitao.,Guo, Jianping.,...&Chen, Ping.(2011).Improved Dehydrogenation Properties of Calcium Borohydride Combined with Alkaline-Earth Metal Amides.journal of physical chemistry c,115(36),18035-18041.
MLA	Chu, Hailiang,et al."Improved Dehydrogenation Properties of Calcium Borohydride Combined with Alkaline-Earth Metal Amides".journal of physical chemistry c 115.36(2011):18035-18041.