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题名: Hydrogen desorption performance of Ti-mediated MgH(2) and Mg(2)NiH(4)
作者: Zhou Guang-You1;  Zheng Shi-You1;  Fang Fang1;  Zhang Jing1;  Xu Fen2;  Sun Li-Xian2;  Chen Guo-Rong1;  Sun Da-Lin1
关键词: Ti doping ;  hydrogen desorption ;  MgH(2) ;  Mg(2)NiH(4)
刊名: ACTA CHIMICA SINICA
发表日期: 2008-05-14
卷: 66, 期:9, 页:1037-1041
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: TiF(3) and Ti(OBu-n)(4)-doped MgH(2) and Mg(2)NiH(4) were investigated with regard to hydrogen desorption performance. It was found that the onset temperature for hydrogen release was around 420 degrees C for the blank MgH(2), but decrease to 360 and 410 degrees C for the TiF(3)- and the Ti(OBu-n)(4)-doped MgH(2), respectively. For Mg(2)NiH(4), it was reduced from 230 to 220 degrees C after doping with TiF(3), but remained unchanged once doping with Ti(OBu-n)(4). These indicate that TiF(3) is more efficient than Ti(OBu-n)(4) in reducing the stability of MgH(2) and Mg(2)NiH(4). The enhanced desorption kinetics is attained in the TiF(3)-doped MgH(2), but not in the TiF(3)-doped Mg(2)NiH(4). Combined with XRD and FTIR techniques, the catalytic activity was thought to be jointly influenced by the crystal structure of the hydride and the electronic structure of the catalyst. The decrease in hydrogen release temperature and the improvement in kinetics are owing to the weakening of the Mg(Ni)-H bonds through the interactions between the catalyst and the hydride, thus facilitating energetically the formation of intra-H center dot center dot center dot H pairings that further recombine readily towards the molecular hydrogen.
关键词[WOS]: STORAGE PROPERTIES ;  HYDRIDES ;  MAGNESIUM ;  SORPTION ;  ALLOYS ;  NI ;  TITANIUM ;  FE
语种: 英语
WOS记录号: WOS:000256268300005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141177
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

Recommended Citation:
Zhou Guang-You,Zheng Shi-You,Fang Fang,et al. Hydrogen desorption performance of Ti-mediated MgH(2) and Mg(2)NiH(4)[J]. ACTA CHIMICA SINICA,2008,66(9):1037-1041.
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