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题名: The catalytic effect of additive Nb2O5 on the reversible hydrogen storage performances of LiBH4-MgH2 composite
作者: Fan, Mei-Qiang1, 2;  Sun, Li-Xian1;  Zhang, Yao1;  Xu, Fen1;  Zhang, Jian1, 2;  Chu, Hai-liang1, 2
通讯作者: 孙立贤 ;  张耀 ;  徐芬
关键词: lithium borohydride ;  hydrogen storage material ;  magnesium hydride ;  niobium oxide
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2008
DOI: 10.1016/j.ijhydene.2007.09.012
卷: 33, 期:1, 页:74-80
收录类别: SCI
文章类型: Article
部门归属: 15
项目归属: 1504
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Chemistry ;  Electrochemistry ;  Energy & Fuels
英文摘要: LiBH4-MgH2 composite exhibits excellent reversible hydrogen capacity, but it still presents high decomposition temperature over 350 degrees C and sluggish kinetics. For the purpose of optimizing its reaction performance, Nb2O5 was doped into this composite as a catalyst to form a more destabilized and reversible composite system. It possesses a maximum capacity of approximately 6-8 wt% hydrogen releasing below 400 degrees C and could be hydrogenated to 5-6 wt% hydrogen capacity at 400 degrees C under 1.9 MPa. XRD and SEM analysis revealed that NbH2, formed and highly dispersed in the composite, played a key role in changing the original path and resulted in the formation of an intermediate compound (MgB2) in the milling process. The hydrogen storage capacity of the LiBH4-MgH2 (mass ratio, 1 : 2) + 16wt% Nb2O5 composite decreased gradually during the dehydrogenation/hydrogenation cycles and still maintained 5.16 wt% in the third dehydrogenation process. The activation energies EA of LiBH4-MgH2 (mass ratio, 1:2) with 16 wt% Nb2O5 and without Nb2O5 were estimated to be 139.96 and 156.75 kJ mol(-1) by Kissinger method. It indicates that the additive Nb2O5 can decrease the activation energy of LiBH4-MgH2 composite. (C) 2007 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: SORPTION ;  BOROHYDRIDE ;  KINETICS ;  SYSTEMS ;  ALLOYS ;  MGH2 ;  MN ;  FE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000253564000010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99975
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, Mat & Thermochem Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Fan, Mei-Qiang,Sun, Li-Xian,Zhang, Yao,et al. The catalytic effect of additive Nb2O5 on the reversible hydrogen storage performances of LiBH4-MgH2 composite[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2008,33(1):74-80.
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