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Study on hydrogen diffusion behavior in MlNi_(3.75) Co_(0.65) Mn_(0.4) Al_(0.2) alloy electrode by chronoamperometry

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中国有色金属学会会刊：英文版 2001年第5期11卷 700-703页

作者：原鲜霞徐乃欣 Chinese Acad Sci Shanghai Inst Met Shanghai 200050 Peoples R China

hydrogen diffusion coefficients in MlNi 3.75 Co 0.65 Mn 0.4 Al 0.2 alloy electrode as a function of state of charge (SOC) or temperature were determined by chronoamperometry. It is found that hydrogen diffusion coefficient decreases with the increase of SOC or the decrease of temperature. The activation energy for hydrogen diffusion in the alloy electrode with 50%SOC is evaluated to be 19.9?kJ/mol.

关键词： hydrogen storage alloy electrode hydrogen diffusion coefficient, chronoamperometry

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Microstructure and Electrochemical Characteristics of Melt-Spinning alloy Ml(NiCoMnAl)_5

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Journal of Rare Earths 2001年第1期19卷 80-80页

作者： WEN Ming fen 1,2 , CHEN Lian 1, TONG Min 1, CHEN De min 1, ZHAI Yu chun 2 ( 1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China 2. Department of Materials and Metallurgy, Northeastern University, Shenyang 11000 Institute of Metal Research Chinese Academy of Sciences Department of Materials and Metallurgy Northeastern University Institute of Metal Research Chinese Academy of Sciences Department of Materials and Metallurgy Northeastern University

The microstructure and electrochemical characteristics of Ml(NiCoMnAl) 5 alloys prepared by both the melt spinning method and the conventional induction melting were investigated and compared. SEM and XRD studies show that the microstructure of melt spinning alloys is columnar structure. With increasing melt spinning rate, the crystal grains become finer and preferentially grow along (111)[111] direction. The melt spinning and cast alloys belong to CaCu 5 type hexagonal crystal structure. The electrochemical measurements show that the initial capacities of melt spinning alloy electrodes are all above 210 mAh·g -1 with good activation behavior, reaching their maximum capacities after two charge discharge cycles. The maximum capacity (294 mAh·g -1 ) of melt spinning (10 m·s -1 ) alloy electrodes is as the same as that of as cast alloy electrode, and stability of charge discharge cycles of all melt spinning alloy electrodes is better than that of the as cast alloy electrodes. When charged at 600 mA·g -1 , the capacity of melt spinning (10 m·s -1 ) alloy electrode could reach 65% of its maximum capacity about 45 min with high rate discharge capability; but with the cycle number increasing, the stability of its capacity is less than that electrodes of melt spinning rate.

关键词： rare earths melt spinning method hydrogen storage alloy electrode electrochemical characteristics columnar structure

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