The destabilization mechanism and de/re-hydrogenation kinetics of MgH(2)-LiAlH(4) hydrogen storage system
文献类型：期刊论文
| 作者 | Zhang, Yao1; Tian, Qi-Feng2,3; Liu, Shu-Sheng1; Sun, Li-Xian1 |
| 刊名 | journal of power sources
 |
| 出版日期 | 2008-12-01 |
| 卷号 | 185期号:2页码:1514-1518 |
| 关键词 | MgH(2)-LiAlH(4) system Hydrogen storage Destabilization mechanism De/re-hydrogenation kinetics |
| 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. |
| WOS标题词 | science & technology ; physical sciences ; technology |
| 类目[WOS] | electrochemistry ; energy & fuels |
| 研究领域[WOS] | electrochemistry ; energy & fuels |
| 关键词[WOS] | h-sorption ; thermal-stability ; metal-hydrides ; mgh2 powders ; magnesium ; nanoparticles ; improvement ; nb2o5 ; fe ; nanocomposites |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000261748900135 |
| 公开日期 | 2015-11-17 |
| 源URL | [http://159.226.238.44/handle/321008/140792]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 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 |
| 推荐引用方式 GB/T 7714 | 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. |
| APA | Zhang, Yao,Tian, Qi-Feng,Liu, Shu-Sheng,&Sun, Li-Xian.(2008).The destabilization mechanism and de/re-hydrogenation kinetics of MgH(2)-LiAlH(4) hydrogen storage system.journal of power sources,185(2),1514-1518. |
| MLA | Zhang, Yao,et al."The destabilization mechanism and de/re-hydrogenation kinetics of MgH(2)-LiAlH(4) hydrogen storage system".journal of power sources 185.2(2008):1514-1518. |
入库方式： OAI收割
来源：大连化学物理研究所
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