Abstract: In this work, the rare earth doping hydrogen storage system were constructed to improve the properties of Mg-based hydrogen storage alloys by improving the catalytic characteristic of the rare earth hydride, and the difference of the performance of the different rare earth doping was analyzed in order to obtain the way to enhance the thermodynamic and kinetic properties. The Mg90Ce5RE5 (RE=La,Nd,Sm,Y) alloys were prepared by vacuum induction melting, and the corresponding phase composition and microstructure were also analyzed. Meanwhile, the PCT curves and the kinetic properties of isothermal hydrogen adsorption and desorption at different temperatures also were tested by the Sie-vert isometric volume method. The results indicate that the hydrogenated Mg90Ce5RE5 (RE=La,Nd,Sm,Y) samples are the composites mate-rials consisting of MgH2 phases and the corresponding REH2+x phases. However, only the MgH2 phases decompose into corresponding Mg phases after desorption hydrogen. The in-situ formed REH2+x phase that doesn’t decompose in the dehydrogenated reaction, acts as diffe-rent catalytic to promote the reversible conversion of Mg and MgH2, which result in a change in PCT plateau pressure of the different alloys and further affects their thermodynamics and kinetic properties. The regularities of enthalpy change from large to small are Mg90Ce5La5>Mg90Ce5Nd5>Mg90Ce5Sm5>Mg90Ce5Y5, which is consistent with the affinity relationship between each element and Ce, so it can be concluded that the co-doping of heterogeneous elements is more conducive to improving the thermodynamic performance. Meanwhile, the dehydrogenation activation energies of RE=La, Nd, Sm and Y alloys are 112.6 kJ/mol, 114.3 kJ/mol, 104.9 kJ/mol and 123.3 kJ/mol, respectively. In addition, the rate of hydrogen desorption reaction of each alloy is limited by the recombination energy of hydrogen on the alloy surface, which provides an important scientific basis for the improvement of rare earth Mg-based hydrogen storage alloys.
作者简介: 李英杰,太原科技大学材料科学与工程学院讲师。1995年西北工业大学高分子材料与工程专业本科毕业, 2008年沈阳工业大学材料学专业硕士毕业。目前主要从事材料制备与表征、新能源材料的研究工作。在Strength of Materials、Optoelectronics and Advanced Materials、《以特种铸造及有色合金》等期刊发表多篇文章。 胡季帆,太原科技大学材料科学与工程学院特聘教授、长江学者、博士研究生导师。1985年山东大学物理学专业本科毕业,1988年中科院物理研究所凝聚态物理专业硕士毕业,1993年中科院物理研究所凝聚态物理专业博士毕业。目前主要从事储氢、永磁等稀土功能材料的研究工作。发表论文200余篇,包括Renewable Energy、Materials Characte-rization、International Journal of Hydrogen Energy、Journal of Magnesium and Alloys等。曾获教育部科技进步一等奖。
引用本文:
李英杰, 姚继伟, 雍辉, 马江微, 王帅, 胡季帆. 稀土掺杂对稀土-镁基合金储氢性能的影响[J]. 材料导报, 2022, 36(20): 22010264-8.
LI Yingjie, YAO Jiwei, YONG Hui, MA Jiangwei, WANG Shuai, HU Jifan. Effect of Rare Earth Doping on Hydrogen Storage Properties of RE-Mg Based Hydrogen Storage Alloys. Materials Reports, 2022, 36(20): 22010264-8.
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2022, Vol. 36 
