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学科主题: 物理化学
题名: Hydrogen storage over alkali metal hydride and alkali metal hydroxide composites
作者: Yu, Pei1;  Chua, Yong Shen1;  Cao, Hujun1;  Xiong, Zhitao1;  Wu, Guotao1;  Chen, Ping1
通讯作者: YongshenChua ;  ZhitaoXiong
关键词: hydrogen storage ;  alkali metal hydroxide ;  alkali metal hydride ;  thermodynamic ;  kinetic
刊名: JOURNAL OF ENERGY CHEMISTRY
发表日期: 2014-07-01
DOI: 10.1016/S2095-4956(14)60166-2
卷: 23, 期:4, 页:414-419
收录类别: SCI
文章类型: Article
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
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.
关键词[WOS]: COMPLEX ;  SYSTEM
语种: 英语
WOS记录号: WOS:000340350900002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/144444
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 Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
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.
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