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题名: Study of the correlation between the stability of mg-based hydride and the ti-containing agent
作者: Zheng, Shiyou;  Fang, Fang;  Zhang, Jing;  Sun, Lixian;  He, Bo;  Wei, Shiqiang;  Chen, Guorong;  Sun, Dalin
通讯作者: SUN D L
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2007-09-20
DOI: 10.1021/jp0754076
卷: 111, 期:37, 页:14021-14025
收录类别: SCI
文章类型: Article
部门归属: 15
项目归属: 1504
产权排名: 2;4
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
英文摘要: The thermal stability and hydrogen desorption kinetics for MgH2 and Mg2NiH4 before and after doping with TiF3 or Ti(OBU")(4) were studied by X-ray diffraction, differential thermal analysis, thermogravimetry, Fourier transform infrared spectroscopy, and X-ray absorption spectroscopy techniques. Unlike the previous work, the mixture of the hydrides and the dopants was gently ground for a short time to avoid the undesirable side effects accompanied by an intensive or prolonged grinding. It is shown that the onset temperature for hydrogen release is around 420 degrees C for the blank MgH2, but decreases to 360 and 410 degrees C for the TiF3- and the Ti(OBU")(4)-doped MgH2, respectively. For Mg2NiH4, it is reduced from 230 to 220 degrees C after doping with TiF3 but remains unchanged once doping with Ti(OBU")(4). These indicate that TiF3 is more efficient than Ti(OBU")(4) in reducing the stability of MgH2 and Mg2NiH4. The enhanced desorption kinetics is attained in the TiF3-doped MgH2, but not in the TiF3- or Ti(OBu")(4)-doped Mg2NiH4. It is believed that the interactions between the hydrides and the Ti-containing agents weaken the Mg(Ni)-H bonds and thus favors the recombination of hydrogen atoms toward the hydrogen molecules. These interactions are substantially influenced by both the hydrides and the Ti-containing agents.
关键词[WOS]: HYDROGEN-STORAGE MATERIALS ;  MG2NIH4 ;  ALLOYS ;  MAGNESIUM ;  SORPTION ;  NI ;  FE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000249501800054
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99059
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.Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
3.Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China

Recommended Citation:
Zheng, Shiyou,Fang, Fang,Zhang, Jing,et al. Study of the correlation between the stability of mg-based hydride and the ti-containing agent[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2007,111(37):14021-14025.
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