稀土掺杂对稀土-镁基合金储氢性能的影响

doi:10.11896/cldb.22010264

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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 REH_2+x phases. However, only the MgH₂ phases decompose into corresponding Mg phases after desorption hydrogen. The in-situ formed REH_2+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.

Key words： hydrogen storage Mg-based alloy rare earth doping hydrogenation reaction

Published: Online: 2022-10-26

CLC number:

TG139.1

Fund:National Natural Science Foundation of China (51761032, 51871125), the Doctoral Starting Foundation of Shanxi Province (20212042, 20212046), and Scientific Research Starting Foundation of Taiyuan University of Science and Technology (20202040, 20212041).

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	LI Yingjie
	YAO Jiwei
	YONG Hui
	MA Jiangwei
	WANG Shuai
	HU Jifan

Cite this article:

LI Yingjie,YAO Jiwei,YONG Hui, et al. Effect of Rare Earth Doping on Hydrogen Storage Properties of RE-Mg Based Hydrogen Storage Alloys[J]. Materials Reports, 2022, 36(20): 22010264-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22010264 OR http://www.mater-rep.com/EN/Y2022/V36/I20/22010264

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