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Effect of praseodymium substitution for lanthanum on structure and properties of La0.65-xPrxNd0.12Mg0.23Ni3.4Al0.1(X=0.00-0.20) hydrogen storage alloys
引用本文:闫慧忠,孔繁清,熊玮,李宝犬,李金.Effect of praseodymium substitution for lanthanum on structure and properties of La0.65-xPrxNd0.12Mg0.23Ni3.4Al0.1(X=0.00-0.20) hydrogen storage alloys[J].中国稀土学报(英文版),2009,27(2):244-249.
作者姓名:闫慧忠  孔繁清  熊玮  李宝犬  李金
作者单位:Ruike National Engineering Research Center of RE Metallurgy & Functional Materials,Baotou 014030,China;Baotou Research Institute of Rare Earth,Baotou 014030,China  
基金项目:the Key Projects in International Science and Technology Cooperation from Ministry of Science and Technology of the PRC,国家自然科学基金 
摘    要:

关 键 词:贮氢合金  储氢性能  结构  香格里拉  扫描电子显微镜    放电容量  EDS公司
收稿时间:24 September 2008

Effect of praseodymium substitution for lanthanum on structure and properties of La0.65-xPrxNd0.12Mg0.23Ni3.4Al0.1(x=0.00-0.20) hydrogen storage alloys
YAN Huizhong,KONG Fanqing,XIONG Wei,LI Baoquan,LI Jin.Effect of praseodymium substitution for lanthanum on structure and properties of La0.65-xPrxNd0.12Mg0.23Ni3.4Al0.1(x=0.00-0.20) hydrogen storage alloys[J].Journal of Rare Earths,2009,27(2):244-249.
Authors:YAN Huizhong  KONG Fanqing  XIONG Wei  LI Baoquan  LI Jin
Affiliation:1. Ruike National Engineering Research Center of RE Metallurgy & Functional Materials, Baotou 014030, China; 2. Baotou Research Institute of Rare Earth, Baotou 014030, China)
Abstract:In order to investigate the effect of substituting La with Pr on structural and hydrogen storage properties of La-Mg-Ni system (AB3.5-type) hydrogen storage alloys, a series of La0.65-xPrxNd0.12Mg0.23Ni3.4Al0.1(x=0, 0.10, 0.15, 0.2) hydrogen storage alloys were prepared. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) analyses revealed that two alloys (x=0.0 and 0.10) were composed of (La, Mg)2(Ni,Al)7 phase, La(Ni,Al)5 phase and (La,Mg)Ni2 phase, while other alloys (x=0.15 and 0.20) consisted of (La,Mg)2(Ni,Al)7 phase, La(Ni,Al)5 phase, (La,Mg)Ni2 phase and (La, Mg)(Ni,Al)3 phase. All alloys showed, however, only one pressure plateau in P-C isotherms. The Pr/La ratio in alloy composition influenced hydrogen storage capacity and kinetics properties. Elec-trochemical studies showed that the discharge capacity decreased from 360 mAh/g (x=0.00) to 335 mAh/g (x=0.20) as x increased. But the high-rate dischargeability (HRD) of alloy electrodes increased from 26% (x=0.00) to 56% (x=0.20) at a discharge current density of Id=1800 mA/g. Anode polarization measurements were done to further understand the electrochemical kinetics properties after Pr substitution.
Keywords:hydrogen storage alloy  La-Mg-Ni system  metal hydrides  MH/Ni batteries  electrochemical properties  rare earths
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