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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
KeywordMg-based Electrode Alloys Hydrogen Storage Mechanical Alloying Electrochemical Properties Substitutions
Source PublicationJOURNAL OF POWER SOURCES
2006-08-25
DOI10.1016/j.jpowsour.2005.10.068
Volume158Issue:2Pages:1463-1471
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectElectrochemistry ; Energy & Fuels
WOS Research AreaElectrochemistry ; Energy & Fuels
WOS KeywordAMORPHOUS-ALLOYS ; DISCHARGE CAPACITIES ; ELECTRODE ALLOYS ; NI CONTENT ; TI ; TERNARY ; BEHAVIOR ; MGNI ; ZR ; PERFORMANCE
AbstractAmorphous 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.
Language英语
WOS IDWOS:000240842800096
Citation statistics
Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/140108
Collection中国科学院大连化学物理研究所
Affiliation1.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
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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