Study of the Effect of Y Partially Substituting La on the Phase Structure and Hydrogen Storage Properties of La-Mg-Ni Alloys
As-cast La(2-x)YxMg16Ni(x = 0,0.1,0.2,0.3,0.4)alloys were prepared by a vacuum induction melting furnace in this paper.To study the effect of Y partial substituting La on the phase structure and hydrogen storage thermodynamics and dynamics properties of the prepared alloys,X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscope(TEM)and automatic Sieverts apparatus have been used in this experiment.The result shows both hydrogenated and dehydrogenated alloys show a nanocrystalline structure.The pressure-compositiontemperature(PCT)curves of alloys show a quite small hysteresis,the thermodynamic parameters calculated from which have a slight fluctuation.In the first few minutes,the prepared alloys absorb hydrogen very fast,after which they need a long time to be fully hydrogenated.Increasing Y content is beneficial for improving the hydrogen storage dynamics,including hydrogen absorption and desorption rates and dehydrogenation activation energy.The dehydrogenation activation energies of La(2-x)YxMg16Ni(x = 0,0.1,0.2,0.3,0.4)alloys are 84.49,80.81,78.17,77.35 and 77.24 kJ/mol respectively,which is thought to be responsible for the gradually accelerated hydrogen desorption rate with the increase of Y content.
Mg-based alloy Y substitution hydrogen storage property comparison
Zhang Wei Zhang Yanghuan Yuan Zeming Qi Yan Zhao Dongliang
Department of Functional Material Research,Central Iron and Steel Research Institute,Beijing 100081, Department of Functional Material Research,Central Iron and Steel Research Institute,Beijing 100081,
国际会议
北京
英文
1773-1781
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）