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题名: Effects of Pd substitution on the electrochemical properties of Mg0.9-xTi0..1PdxNi (x=0.04-0.1) hydrogen storage alloys
作者: Tian, Qi-Feng;  Zhang, Yao;  Sun, Li-Xian;  Xu, Fen;  Tan, Zhi-Cheng;  Yuan, Hua-Tang;  Zhang, Tao
关键词: Mg-based electrode alloys ;  hydrogen storage ;  mechanical alloying ;  electrochemical properties ;  substitutions
刊名: JOURNAL OF POWER SOURCES
发表日期: 2006-08-25
DOI: 10.1016/j.jpowsour.2005.10.068
卷: 158, 期:2, 页:1463-1471
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: Amorphous Mg0.9-xTi0.1PdxNi (x = 0.04-0.1) hydrogen storage alloys were prepared by mechanical alloying (MA). The effects of Pd substitution on the electrochemical properties of the Mg0.9-xTi0.1PdxNi (x = 0.04-0.1) electrode alloys were studied by cyclic charge-discharge, linear polarization, anodic polarization, electrochemical impedance spectroscopy (EIS), and hydrogen diffusion coefficient experiments. It was found that the cyclic capacity retention rate C-50/C-1 of the quaternary alloys was greatly improved due to the substitution of Pd for Mg. Mg0.8Ti0.1Pd0.1Ni electrode alloy retained the discharge capacity above 200 mAh g(-1) even after 80 charge-discharge cycles, possessing the longest cycle life in the studied quaternary alloys. The improvement of cycle life was ascribed to the formation of passive film on the surface of these electrode alloys. X-ray photoelectron spectroscopy (XPS) analysis proved that the passive film was composed of Mg(OH)(2), TiO2, NiO, and PdO, which synergistically protected the alloy from further oxidation. The Auger Electron Spectroscopy (AES) study revealed that the thickness of passive film increased with augmentation of the Pd content. The electrochemical impedance study of electrode alloys after different cycles demonstrated that the passive film became thicker during cycles and its thickness also increased with Pd content augmentation. It was also found that the augmentation of Pd content resulted in the decrease of exchange current density I-0 and the increase of the charge-transfer resistance R-ct. With increasing the Pd amount in the Mg0.9-xTi0.1PdxNi (x = 0.04-0.1) electrode alloys, hydrogen diffusion coefficient D was gradually enhanced at first. Then, it decreased with augmentation of cycle due to the growth of passive film on the surface of the alloys. (c) 2005 Elsevier B.V. All rights reserved.
关键词[WOS]: AMORPHOUS-ALLOYS ;  DISCHARGE CAPACITIES ;  ELECTRODE ALLOYS ;  NI CONTENT ;  TI ;  TERNARY ;  BEHAVIOR ;  MGNI ;  ZR ;  PERFORMANCE
语种: 英语
WOS记录号: WOS:000240842800096
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140108
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, 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

Recommended Citation:
Tian, Qi-Feng,Zhang, Yao,Sun, Li-Xian,et al. Effects of Pd substitution on the electrochemical properties of Mg0.9-xTi0..1PdxNi (x=0.04-0.1) hydrogen storage alloys[J]. JOURNAL OF POWER SOURCES,2006,158(2):1463-1471.
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