Gaseous hydrogen storage properties of Mg-Y-Ni-Cu alloys prepared by melt spinning
来源期刊：JOURNAL OF RARE EARTHS2019年第7期
论文作者：Yanghuan Zhang Yaqin Li Wei Zhang Zeming Yuan Zhonghui Hou Yan Qi Shihai Guo
文章页码：750 - 759
摘 要：For purpose of promoting the hydrogen absorption and desorption thermodynamics and kinetics properties of Mg-Ni-based alloys, partially substituting Y and Cu for Mg and Ni respectively and melt spinning technique were applied for getting Mg25-xYxNi9 Cu（χ = 0-7） alloys. Their microstructures and phases were characterized with the help of X-ray diffraction and transmission electron microscopy. Their hydrogen absorbing and desorbing properties were tested by a Sievert apparatus, DSC, and TGA, which were connected with a H2 detector. In order to estimate the dehydrogenation activation energy of alloy hydride, both Arrhenius and Kissinger methods were applied for calculation. It is found that their hydriding kinetics notably declines, however, their hydrogen desorption kinetics conspicuously improves, with spinning rate and Y content increasing. Their hydrogen desorption activation energy markedly decreases under the same constraint, and it is found that melt spinning and Y substituting Mg improve the real driving force for dehydrogenation. As for the tendency of hydrogen absorption capacity,it presents an elevation firstly and soon after a decline with the rising of spinning rate, however, it always lowers with Y content growing. With Y content and spinning rate increasing, their thermodynamic parameters（△H and △S absolute values） visibly decrease, and the starting hydrogen desorption temperatures of alloy hydrides obviously lower.
Yanghuan Zhang1,2，Yaqin Li3,2，Wei Zhang1,2，Zeming Yuan1,2，Zhonghui Hou1,2，Yan Qi2，Shihai Guo2
1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology2. Department of Functional Material Research, Central Iron and Steel Research Institute3. Institute for Advanced Materials and Technology, University of Science and Technology Beijing
摘 要：For purpose of promoting the hydrogen absorption and desorption thermodynamics and kinetics properties of Mg-Ni-based alloys, partially substituting Y and Cu for Mg and Ni respectively and melt spinning technique were applied for getting Mg25-xYxNi9 Cu（χ = 0-7） alloys. Their microstructures and phases were characterized with the help of X-ray diffraction and transmission electron microscopy. Their hydrogen absorbing and desorbing properties were tested by a Sievert apparatus, DSC, and TGA, which were connected with a H2 detector. In order to estimate the dehydrogenation activation energy of alloy hydride, both Arrhenius and Kissinger methods were applied for calculation. It is found that their hydriding kinetics notably declines, however, their hydrogen desorption kinetics conspicuously improves, with spinning rate and Y content increasing. Their hydrogen desorption activation energy markedly decreases under the same constraint, and it is found that melt spinning and Y substituting Mg improve the real driving force for dehydrogenation. As for the tendency of hydrogen absorption capacity,it presents an elevation firstly and soon after a decline with the rising of spinning rate, however, it always lowers with Y content growing. With Y content and spinning rate increasing, their thermodynamic parameters（△H and △S absolute values） visibly decrease, and the starting hydrogen desorption temperatures of alloy hydrides obviously lower.
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