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郭振福,侯占忠,高贵军,高晓娜,郭洋洋,杨桂玲.复合储氢合金Mg1.8Zr0.2Ni- (1.2-x)Ni -xMgTi3结构和电化学性能研究[J].稀有金属材料与工程(英文),2018,47(6):1911~1915.[Guo Zhenfu,Hou Zhanzhong,Gao Guijun,Gao Xaona,Guo Yangyang and Yang Guiling.Research on the Structure and Electrochemical Properties of the Composite Hydrogen Storage Alloys Mg1.8Zr0.2Ni- (1.2-x) -xMgTi3[J].Rare Metal Materials and Engineering,2018,47(6):1911~1915.]
Research on the Structure and Electrochemical Properties of the Composite Hydrogen Storage Alloys Mg1.8Zr0.2Ni- (1.2-x) -xMgTi3
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Received:May 10, 2016  Revised:October 22, 2016
DOI:
Key words: magnesium-based hydrogen storage alloys  mechanical alloying  partial substitution  electrochemical properties
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Guo Zhenfu,Hou Zhanzhong,Gao Guijun,Gao Xaona,Guo Yangyang and Yang Guiling  
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Abstract:
      In order to improve the electrochemical properties of hydrogen storage alloys Mg2Ni, the modified alloy Mg1.8 Zr0.2Ni and MgTi3 was prepared respectively by mechanical alloying (Mechanical Alloying, MA). Then the amorphous modified alloy Mg1.8Zr0.2Ni- (1.2-x) Ni -xMgTi3 was prepared by ball milling a certain percentage Mg1.8 Zr0.2Ni, MgTi3 and Ni. The results show that the composite hydrogen storage alloys after partially replace modified and coating modified have a large number of nanoscale folds, layered voids and multiphase structural defects in their the surface and the interior. With the increase of MgTi3 content, the initial discharge specific capacity of Mg1.8Zr0.2Ni- (1.2-x) Ni -xMgTi3 is also gradually increased. When the content of MgTi3 was x=0.5, the initial discharge specific capacity was 973.3 mAh.g-1. But when the content of MgTi3 was more than x=0.5, the initial discharge specific capacity decreased rapidly. The study shows that the addition of MgTi3 is not beneficial to the cycle stability and high rate discharge performance of the composite hydrogen storage alloys. By tested to the linear polarization,anodic polarization and exchange impedance of Mg1.8Zr0.2Ni- (1.2-x) Ni -xMgTi3, the electrochemical reaction of surface, charge transfer process, the hydrogen diffusion in the alloy and the performance of their electrochemical kinetics of modified alloys were further researched.