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Electrochemical performances of cobalt-free La0.7Mg0.3Ni3.5-x(MnAl2)(x) (x=0-0.20) hydrogen storage alloy electrodes
Chu, Hailiang1,2; Zhang, Yao1; Qiu, Shujun1,2; Qi, Yanni1,2; Sun, Lixian1; Xu, Fen1; Wang, Qing3; Dong, Chuang3
KeywordElectrode Materials Hydrogen Storage Alloys Electrochemical Properties Partial Substitution
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
2008-06-12
DOI10.1016/j.jallcom.2007.03.046
Volume457Issue:1-2Pages:90-96
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS KeywordMETAL HYDRIDE ELECTRODES ; CO CONTENT ; CAPACITY ; SUBSTITUTION ; LAMG2NI9 ; BATTERY ; NI ; X=0.1-0.5 ; BEHAVIOR ; PHASE
AbstractCobalt-free AB(3)-type La0.7Mg0.3Ni3.5-x(MnAl2), (x=0-0.20) nonstoichiometric alloys were synthesized and investigated for their electrochemical hydrogen storage properties. It was found that the maximum discharge capacity of La0.7Mg0.3Ni3.5-x(MnAl2) (x = 0-0.20) alloy electrodes decreases from 362.7 mAh/g (x = 0) to 293.9 mAh/g (x = 0.20) with increasing x. The cyclic capacity retention rate C-100/C-max of alloy electrodes initially increases to 43.7% (x = 0.10) due to the formation of M-containing passive film, and subsequently decreases to 35.9% (x = 0.20) since the passive film is cracked. These phenomena are demonstrated by scanning electron microscopy (SEM) images of alloy electrodes after 70 charge-discharge cycles. It was also revealed that the electrochemical reaction kinetics is retarded when x<0.10, which can be ascribed to the increase of charge-transfer resistance of the alloy electrodes due to the formation of Al-containing passive film. When x > 0.10, the electrochemical kinetics is enhanced because of the crack of the Al oxide film on the electrode surface resulting from the dissolution of Mn into the alkaline electrolyte. The optimal content of Mn and Al in La0.7Mg0.3Ni3.5-x(MnAl2)(x) alloys for negative electrodes in alkaline rechargeable secondary batteries is x = 0.10 in this study. (C) 2007 Elsevier B.V. All rights reserved.
Language英语
WOS IDWOS:000256124900022
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/141118
Collection中国科学院大连化学物理研究所
Affiliation1.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.Dalian Univ Technol, State Key Lab Mat Modificat, Dalian 116024, Peoples R China
Recommended Citation
GB/T 7714
Chu, Hailiang,Zhang, Yao,Qiu, Shujun,et al. Electrochemical performances of cobalt-free La0.7Mg0.3Ni3.5-x(MnAl2)(x) (x=0-0.20) hydrogen storage alloy electrodes[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2008,457(1-2):90-96.
APA Chu, Hailiang.,Zhang, Yao.,Qiu, Shujun.,Qi, Yanni.,Sun, Lixian.,...&Dong, Chuang.(2008).Electrochemical performances of cobalt-free La0.7Mg0.3Ni3.5-x(MnAl2)(x) (x=0-0.20) hydrogen storage alloy electrodes.JOURNAL OF ALLOYS AND COMPOUNDS,457(1-2),90-96.
MLA Chu, Hailiang,et al."Electrochemical performances of cobalt-free La0.7Mg0.3Ni3.5-x(MnAl2)(x) (x=0-0.20) hydrogen storage alloy electrodes".JOURNAL OF ALLOYS AND COMPOUNDS 457.1-2(2008):90-96.
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