Hydrogen storage over alkali metal hydride and alkali metal hydroxide composites

	Hydrogen storage over alkali metal hydride and alkali metal hydroxide composites
	Yu, Pei; Chua, Yong Shen; Cao, Hujun; Xiong, Zhitao; Wu, Guotao; Chen, Ping
刊名	journal of energy chemistry
	2014-07-01
卷号	23 期号:4 页码:414-419
关键词	hydrogen storage alkali metal hydroxide alkali metal hydride thermodynamic kinetic
通讯作者	yongshenchua ; zhitaoxiong
英文摘要	alkali metal hydroxide and hydride composite systems contain both protic (h bonded with o) and hydridic hydrogen. the interaction of these two types of hydrides produces hydrogen. the enthalpy of dehydrogenation increased with the increase of atomic number of alkali metals, i.e., -23 kj/mol(h2) for lioh-lih, 55.34 kj/mol(h2) for naoh-nah and 222 kj/mol(h2) for koh-kh. these thermodynamic calculation results were consistent with our experimental results. h-2 was released from lioh-lih system during ball milling. the dehydrogenation temperature of naoh-nah system was about 150 degrees c; whereas koh and kh did not interact with each other during the heating process. instead, kh decomposed by itself. in these three systems, naoh-nah was the only reversible hydrogen storage system, the enthalpy of dehydrogenation was about 55.65 kj/mol(h2), and the corresponding entropy was ca. 101.23 j/(mol(h2)center dot k), so the temperature for releasing 1.0 bar h-2 was as high as 518 degrees c, showing unfavorable thermodynamic properties. the activation energy for hydrogen desorption of naoh-nah was found to be 57.87 kj/mol, showing good kinetic properties.
学科主题	物理化学
WOS标题词	science & technology ; physical sciences ; technology
类目[WOS]	chemistry, applied ; chemistry, physical ; energy & fuels ; engineering, chemical
研究领域[WOS]	chemistry ; energy & fuels ; engineering
关键词[WOS]	complex ; system
收录类别	SCI
语种	英语
WOS记录号	WOS:000340350900002
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/144444]
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 Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Yu, Pei,Chua, Yong Shen,Cao, Hujun,et al. Hydrogen storage over alkali metal hydride and alkali metal hydroxide composites[J]. journal of energy chemistry,2014,23(4):414-419.
APA	Yu, Pei,Chua, Yong Shen,Cao, Hujun,Xiong, Zhitao,Wu, Guotao,&Chen, Ping.(2014).Hydrogen storage over alkali metal hydride and alkali metal hydroxide composites.journal of energy chemistry,23(4),414-419.
MLA	Yu, Pei,et al."Hydrogen storage over alkali metal hydride and alkali metal hydroxide composites".journal of energy chemistry 23.4(2014):414-419.