中国科学院大连化学物理研究所机构知识库
Advanced  
DICP OpenIR  > 中国科学院大连化学物理研究所  > 期刊论文
题名: The destabilization mechanism and de/re-hydrogenation kinetics of MgH(2)-LiAlH(4) hydrogen storage system
作者: Zhang, Yao1;  Tian, Qi-Feng2, 3;  Liu, Shu-Sheng1;  Sun, Li-Xian1
关键词: MgH(2)-LiAlH(4) system ;  Hydrogen storage ;  Destabilization mechanism ;  De/re-hydrogenation kinetics
刊名: JOURNAL OF POWER SOURCES
发表日期: 2008-12-01
DOI: 10.1016/j.jpowsour.2008.09.054
卷: 185, 期:2, 页:1514-1518
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Electrochemistry ;  Energy & Fuels
英文摘要: Unfavourable stability and sluggish de/re-hydrogenation kinetics hamper the application of MgH(2) as a hydrogen storage material for mobile fuel cell systems. In the present work, it can be destabilized effectively by LiAlH(4) in as-synthesized MgH(2)-LiAlH(4) composites (1:1,21 and 4:1 in mole ratio). The onset dehydrogenation temperature of MgH2 is observed at around 250 degrees C, which is over 50 degrees C lower from that of as-milled MgH2. Differential scanning calorimetry (DSC) measurements indicate that the enthalpies of MgH(2)-relevant decomposition in MgH(2)-LiAlH(4) composites (1:1, 2:1 and 4:1 in mole ratio) are 45, 48.6 and 61 kJ mol(-1) H(2), respectively. These values decrease significantly from that of as-milled pristine MgH(2) (76 kJ mol(-1) H(2)), demonstrating the destabilization of MgH(2) in this system. The destabilization mechanism is investigated by X-ray diffraction (XRD) analyses. It was found that the whole dehydrogenation process can be divided into two stages: the first stage is the two-step decomposition of LiAlH(4) and during the second stage, the yielded LiH and Al phases decompose MgH2 to form Li(0.92)Mg(4).(08) and Mg(17)Al(12) phases, respectively. The mutual destabilization between MgH2 and LiH was first observed in this study. Moreover, the reaction is fully reversible. The isothermal kinetics shows that the doped LiAlH(4) is beneficial to the enhancement of the dehydrogenation kinetics of MgH(2). (C) 2008 Elsevier B.V. All rights reserved.
关键词[WOS]: H-SORPTION ;  THERMAL-STABILITY ;  METAL-HYDRIDES ;  MGH2 POWDERS ;  MAGNESIUM ;  NANOPARTICLES ;  IMPROVEMENT ;  NB2O5 ;  FE ;  NANOCOMPOSITES
语种: 英语
WOS记录号: WOS:000261748900135
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140792
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

Files in This Item:

There are no files associated with this item.


作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Mat & Thermochem Grp, Dalian 116023, Liaoning, Peoples R China
2.Wuhan Inst Technol, Minist Educ, Key Lab Green Chem Proc, Wuhan 430073, Peoples R China
3.Wuhan Inst Technol, Hubei Key Lab Novel Reactor & Green Chem Technol, Wuhan 430073, Peoples R China

Recommended Citation:
Zhang, Yao,Tian, Qi-Feng,Liu, Shu-Sheng,et al. The destabilization mechanism and de/re-hydrogenation kinetics of MgH(2)-LiAlH(4) hydrogen storage system[J]. JOURNAL OF POWER SOURCES,2008,185(2):1514-1518.
Service
 Recommend this item
 Sava as my favorate item
 Show this item's statistics
 Export Endnote File
Google Scholar
 Similar articles in Google Scholar
 [Zhang, Yao]'s Articles
 [Tian, Qi-Feng]'s Articles
 [Liu, Shu-Sheng]'s Articles
CSDL cross search
 Similar articles in CSDL Cross Search
 [Zhang, Yao]‘s Articles
 [Tian, Qi-Feng]‘s Articles
 [Liu, Shu-Sheng]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
  Add to CiteULike  Add to Connotea  Add to Del.icio.us  Add to Digg  Add to Reddit 
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Powered by CSpace