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Enhanced hydrogen storage kinetics of nanocrystalline and amorphous Mg_2N-type alloy by substituting ni with co

Transactions of Nonferrous Metals Society of China 2011年第9期21卷 2002-2009页

作者：张羊换宋春红任慧平李志刚胡锋赵栋梁钢铁研究总院功能材料研究所北京100081 内蒙古科技大学国家重点实验室培育基地包头014010

In order to improve the hydrogen storage kinetics of the Mg2ni-type alloys, ni in the alloy was partially substituted with element co. The Mg2ni-type Mg2ni1-xcox （x=0, 0.1, 0.2, 0.3, 0.4） alloys were fabricated by melt-spinning technique. The structures of the as-spun alloys were characterized by XRD and TEM. The gaseous and electrochemical hydrogen storage kinetics of the alloys was measured. The results show that the substitution of co for ni notably enhances the glass forming ability of the Mg2ni-type alloy. The amorphization degree of the alloys visibly increases with rising of co content. Furthermore, the substitution of co for ni significantly improves the hydrogen storage kinetics of the alloys. With an increase in the amount of co substitution from 0 to 0.4, the hydrogen absorption saturation ratio of the as-spun （15 m/s） alloy increases from 81.2% to 84.9%, the hydrogen desorption ratio from 17.60% to 64.79%, the hydrogen diffusion coefficient increases from 1.07×10-11 to 2.79×10-11 cm2/s and the limiting current density increases from 46.7 to 191.7 mA/g, respectively.

关键词： Mg2ni-type alloy substituting ni with co melt spinning hydrogen storage kinetics

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Gaseous and Electrochemical Hydrogen Storage Kinetics of As-quenched Nanocrystalline and Amorphous Mg_2ni-type Alloys

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Journal of Wuhan University of Technology(Materials Science) 2013年第3期28卷 604-611页

作者：张羊换 YANG Tai SHANG Hongwei ZHANG Guofang CAI Ying ZHAO Dongliang Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Department of Functional Material Research Central Iron and Steel Research Institute

The nanocrystalline and amorphous Mg2ni-type Mg2ni1-xcox （x = 0, 0.1, 0.2, 0.3, 0.4） alloys were synthesized by melt quenching technology. The structures of the as-cast and quenched alloys were characterized by XRD, SEM and HRTEM. The gaseous hydrogen storage kinetics of the alloys was measured using an automatically controlled Sieverts apparatus. The alloy electrodes were charged and discharged with a constant current density in order to investigate the electrochemical hydrogen storage kinetics of the alloys. The results demonstrate that the substitution of co for ni results in the formation of secondary phases Mgco2 and Mg instead of altering the major phase Mg2ni. No amorphous phase is detected in the as-quenched co- ffee alloy, however, a certain amount of amorphous phase is clearly found in the as-quenched alloys substituted by co. Furthermore, both the rapid quenching and the co substitution significantly improve the gaseous and electrochemical hydrogen storage kinetics of the alloys, for which the notable increase of the hydrogen diffusion coefficient （D） along with the limiting current density （IL） and the obvious decline of the electrochemical impedance generated by both the co substitution and the rapid quenching are basically responsible.

关键词： Mg2ni-type alloy rapid quenching substituting ni with co hydrogen storage kinetics

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