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Effects of Pd substitution on the electrochemical properties of Mg0.9-xTi0..1PdxNi (x=0.04-0.1) hydrogen storage alloys
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
2006-08-25
DOI10.1016/j.jpowsour.2005.10.068
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
关键词[WOS]AMORPHOUS-ALLOYS ; DISCHARGE CAPACITIES ; ELECTRODE ALLOYS ; NI CONTENT ; TI ; TERNARY ; BEHAVIOR ; MGNI ; ZR ; PERFORMANCE
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.
语种英语
WOS记录号WOS:000240842800096
引用统计
被引频次:43[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/321008/140108
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, 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
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GB/T 7714
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.
APA Tian, Qi-Feng.,Zhang, Yao.,Sun, Li-Xian.,Xu, Fen.,Tan, Zhi-Cheng.,...&Zhang, Tao.(2006).Effects of Pd substitution on the electrochemical properties of Mg0.9-xTi0..1PdxNi (x=0.04-0.1) hydrogen storage alloys.JOURNAL OF POWER SOURCES,158(2),1463-1471.
MLA Tian, Qi-Feng,et al."Effects of Pd substitution on the electrochemical properties of Mg0.9-xTi0..1PdxNi (x=0.04-0.1) hydrogen storage alloys".JOURNAL OF POWER SOURCES 158.2(2006):1463-1471.
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