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题名: Structure, morphology and hydrogen storage properties of composites prepared by ball milling Ti0.9Zr0.2Mn1.5Cr0.3V0.3 with La-Mg-based alloy
作者: Chu, Hailiang;  Zhang, Yao;  Sun, Lixian;  Qiu, Shujun;  Xu, Fen;  Yuan, Huatang;  Wang, Qing;  Dong, Chuang
关键词: hydrogen storage properties ;  composite material ;  ball milling ;  surface modification
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2007-10-01
DOI: 10.1016/j.ijhydene.2007.02.040
卷: 32, 期:15, 页:3363-3369
收录类别: SCI
文章类型: Article
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: Hydrogen storage alloy composites Ti0.9Zr0.2Mn1.5Cr0.3V0.3 - x wt% La0.7Mg0.25Zr0.05(Ni-0.85 Co-0.15)(3.5) (x = 0, 5, 10) were prepared by ball milling method. Their structures, morphologies and the hydrogen storage characteristics were intensively studied in the present work. It was found that the bulk of composites maintained the hexagonal C14 Laves phase structure after ball milling with additional La-Mg-based alloy for two hours. Scanning electron microscopy (SEM) observations revealed that the average size of Ti0.9Zr0.2Mn1.5Cr0.3V0.3 and La0.7Mg0.25Zr0.05(Ni0.85Co0.15)(3.5) particles were reduced to several hundred nanometers after ball milling process. Energy dispersive X-ray spectrometer (EDS) patterns of the composites showed that the La0.7Mg0.25Zr0.05(Ni0.85Co0.15)(3.5) phase was uniformly distributed on the surface of Ti0.9Zr0.2Mn1.5Cr0.3V0.3. The hydrogen absorption-desorption characteristics of the composites were improved with increasing dispersivity of the La0.7Mg0.25Zr0.05(Ni0.85Co0.15)(3.5) alloy particles. Pressure-composition-temperature (PCT) measurements revealed that the pressure plateau and the hysteresis decreased with increasing x. Among these composites, the sample of x = 10 exhibited more significant hydrogen storage performances. Its hydrogen absorption and desorption plateau pressure were 0.547 and 0.302 MPa, respectively, which were much lower than those of the Ti0.9Zr0.2Mn1.5Cr0.3V0.3 alloy. Moreover, it took only 200 and 2500 s to reach the constant pressure for the hydrogen absorption and desorption reaction. These improvements can be attributed to the preferable dispersivity of La-Mg-based alloy particles and also the formation of micro-crack after ball milling. Both factors synergetically facilitate the diffusion of hydrogen atoms in the composites and accelerate the dissociation of hydrogen molecules and recombination of hydrogen atoms on the surface of composites during the hydrogen absorption-desorption process. (C) 2007 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: TIMN2 BASED ALLOYS ;  ELECTROCHEMICAL PROPERTIES ;  THERMODYNAMIC PROPERTIES ;  ABSORPTION PROPERTIES ;  SORPTION PROPERTIES ;  TIMN2-BASED ALLOYS ;  MULTIPHASE ALLOYS ;  CAPACITY ;  MICROSTRUCTURE ;  SUBSTITUTION
语种: 英语
WOS记录号: WOS:000250900700036
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140404
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 100049, Peoples R China
3.Nankai Univ, Inst New Energy Mat Chem, Tianjin 300071, Peoples R China
4.Dalian Univ Technol, State Key Lab Mat Modificat, Dalian 116024, Peoples R China

Recommended Citation:
Chu, Hailiang,Zhang, Yao,Sun, Lixian,et al. Structure, morphology and hydrogen storage properties of composites prepared by ball milling Ti0.9Zr0.2Mn1.5Cr0.3V0.3 with La-Mg-based alloy[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2007,32(15):3363-3369.
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