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题名: The electrochemical performances of Ti-V-based hydrogen storage composite electrodes prepared by ball milling method
作者: Qiu, Shu-Jun1, 2;  Chu, Hai-Liang1, 2;  Zhang, Yao1;  Sun, Li-Xian1;  Xu, Fen1, 4;  Cao, Zhong3
关键词: Hydrogen storage alloy ;  Ti-V-based alloy ;  Composite ;  Activation property ;  Electrochemical kinetics
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2008-12-01
DOI: 10.1016/j.ijhydene.2008.10.009
卷: 33, 期:24, 页:7471-7478
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: In order to overcome the inherent disadvantages of Ti-V-based hydrogen storage alloys, such as poor activation behavior and low high-rate dischargeability, the novel composites Ti0.17Zr0.08V0.35Cr0.1Ni0.3-x wt.% La0.7Mg0.3Ni2.75Co0.75 (x = 0, 5, 10 and 20) were successfully synthesized by ball milling method in the present study. And the structure and overall electrochemical properties of as-prepared composites are investigated systemically. The electrochemical studies show that the maximum discharge capacity of the composite electrodes displays no variation with the increase of La0.7Mg0.3Ni2.75Co0.75 content, whereas the high-rate dischargeability (HRD) and the activation behavior are distinctly improved with increasing x. The electrochemical hydrogen kinetics of composite electrodes is also studied by means of electrochemical impedance spectroscopy (EIS), linear polarization (LP), anodic polarization (AP) and potential-step measurements. It is found that the charge-transfer reaction resistance R-ct is decreased with increasing the amount of La0.7Mg0.3Ni2.75Co0.75 while exchange current density I-0, limiting current density I-L and hydrogen diffusion coefficient D are all increased with increasing the amount of La0.7Mg0.3Ni2.75Co0.75. These results suggest that the formation of composite with La0.7Mg0.3Ni2.75Co0.75 alloy is a promising strategy for improving the HRD, activation behavior and electrochemical kinetics of Ti-V-based alloy electrodes. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: METAL HYDRIDE ELECTRODES ;  ALKALINE AQUEOUS-SOLUTION ;  SOLID-SOLUTION ALLOYS ;  NEGATIVE ELECTRODES ;  CAPACITY ;  LAMG2NI9 ;  PHASE ;  LA ;  NI ;  MICROSTRUCTURE
语种: 英语
WOS记录号: WOS:000262077900020
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141185
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.Changsha Univ Sci & Technol, Dept Environm Chem & Engn, Changsha 410076, Hunan, Peoples R China
4.Liaoning Normal Univ, Fac Chem & Chem Engn, Dalian 116029, Peoples R China

Recommended Citation:
Qiu, Shu-Jun,Chu, Hai-Liang,Zhang, Yao,et al. The electrochemical performances of Ti-V-based hydrogen storage composite electrodes prepared by ball milling method[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2008,33(24):7471-7478.
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