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Electrochemical hydrogen storage properties of La0.7Mg0.3Ni3.5-Ti0.17Zr0.08V0.35Cr0.1Ni0.3 composites
Chu, Hai-Liang1,2; Qiu, Shu-Jun1,2; Sun, Li-Xian1; Zhang, Yao1; Xu, Fen1; Zhu, Min3; Hu, Wang-Yu4
关键词Composite Electrode Material Hydrogen Storage Electrochemical Reactions Cyclic Stability Electrochemical Kinetics
刊名INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
2008
DOI10.1016/j.ijhydene.2007.10.014
33期:2页:755-761
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
关键词[WOS]METAL HYDRIDE ELECTRODES ; SOLID-SOLUTION ALLOYS ; NI ; TI ; SUBSTITUTION ; LA ; MICROSTRUCTURE ; CAPACITY ; MN ; AL
英文摘要For further improving the electrochemical properties of nonstoichiometric AB(3)-type La0.7Mg0.3Ni3.5 alloy as negative electrode of Ni-MH battery, its related composites La0.7Mg0.3Ni3.5-xwt% Ti0.17Zr0.08V0.35Cr0.1Ni0.3 (x = 5, 10, 25, 40) are prepared by ball milling method. It is found that all these composites are mainly composed of (LaMg)Ni-3 and LaNi5 phases according to XRD patterns. When x <= 25, the V-based solid solution BCC phase and C14 Laves phase in Ti0.17Zr0.08V0.35Cr0.1Ni0.3 alloy are not detectable. As x further increases to 40wt%, however, these two phases appear in XRD pattern. Electrochemical studies show that the maximum discharge capacity of these electrodes decreases slightly from 348.5 mAh/g (x = 5) to 335.2 mAh/g (x = 40), while the cyclic capacity retention rate of composite electrodes is significantly improved from 29.7% (x = 5) to 63.0% (x = 40) after 70 charge-discharge cycles. This improvement of cyclic life can be ascribed to the enhanced anti-corrosion performance of composite electrode in alkaline solution. Moreover, the electrochemical kinetics properties, including the charge-transfer resistance R-ct, the polarization resistance R-p, the exchange cur-rent density I-0, the limiting current density I-L and the hydrogen diffusion coefficient D, of the composite electrodes were retarded first with x increasing from 5 to 25 and then improved when x reaches to 40. (C) 2007 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
语种英语
WOS记录号WOS:000253791300033
引用统计
被引频次:32[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/140831
专题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 Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
3.S China Univ Technol, Sch Mech Engn, Guangzhou 510641, Peoples R China
4.Hunan Univ, Dept Appl Phys, Changsha 410082, Peoples R China
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Chu, Hai-Liang,Qiu, Shu-Jun,Sun, Li-Xian,et al. Electrochemical hydrogen storage properties of La0.7Mg0.3Ni3.5-Ti0.17Zr0.08V0.35Cr0.1Ni0.3 composites[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2008,33(2):755-761.
APA Chu, Hai-Liang.,Qiu, Shu-Jun.,Sun, Li-Xian.,Zhang, Yao.,Xu, Fen.,...&Hu, Wang-Yu.(2008).Electrochemical hydrogen storage properties of La0.7Mg0.3Ni3.5-Ti0.17Zr0.08V0.35Cr0.1Ni0.3 composites.INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,33(2),755-761.
MLA Chu, Hai-Liang,et al."Electrochemical hydrogen storage properties of La0.7Mg0.3Ni3.5-Ti0.17Zr0.08V0.35Cr0.1Ni0.3 composites".INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 33.2(2008):755-761.
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