Enhanced magnetocaloric effect in rare-earth aluminum-based magnetic materials for hydrogen liquefaction

被引:2
作者
Tian, Lu [1 ]
Sun, Haobo [1 ]
Mo, Zhaojun [1 ]
Gao, Xinqiang [1 ]
Li, Zhenxing [3 ]
Liu, Guodong [2 ]
Shen, Jun [3 ]
机构
[1] Chinese Acad Sci, Ganjiang Innovat Acad, Key Lab Rare Earths, Ganzhou 341000, Peoples R China
[2] Hebei Univ Technol, Sch Sci, Tianjin 300130, Peoples R China
[3] Beijing Inst Technol, Sch Mech Engn, Dept Energy & Power Engn, Beijing 100081, Peoples R China
基金
美国国家科学基金会;
关键词
Magnetocaloric effect; Rare-earth compounds; Hydrogen liquefaction; Electronic structure; Low magnetic field;
D O I
10.1016/j.ijhydene.2024.12.167
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Efficient magnetocaloric materials are essential for the liquefaction of hydrogen, a clean energy carrier that requires cryogenic temperatures. Traditional refrigeration methods for hydrogen liquefaction are energyintensive, making the search for alternative technologies critical. This study explores the magnetocaloric properties of Er1-xHoxAl2 compounds, focusing on the effects of Ho doping. Using a combination of density functional theory calculations and experimental measurements, we systematically examine how Ho incorporation influences the electronic structure, magnetic properties, and magnetocaloric effect (MCE) of these materials. Our findings indicate that Ho doping effectively adjusts the Curie temperature to align closely with the hydrogen liquefaction point. Theoretical calculations reveal significant modifications in the electronic structure due to Ho doping, which enhance ferromagnetic interactions. Experimentally, Er0.8Ho0.2Al2 and Er0.6Ho0.4Al2 exhibit maximum magnetic entropy changes of 16.1 J/kg K and 14.7 J/kg K, under a magnetic field change of 0-2 T. The corresponding values for refrigeration capacity (RC) are 150.9 J/kg, and 183.6 J/kg, respectively. These results highlight the potential of Er1-xHoxAl2 compounds as efficient magnetocaloric materials for hydrogen liquefaction, offering substantial performance improvements under low magnetic fields.
引用
收藏
页码:1205 / 1211
页数:7
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