首页|Phase evolution,hydrogen storage thermodynamics,and kinetics of ternary Mg98Ho1.5Fe0.5 alloy

Phase evolution,hydrogen storage thermodynamics,and kinetics of ternary Mg98Ho1.5Fe0.5 alloy

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Rare earth elements and transition metals have been found to improve the hydrogen storage charac-teristics of magnesium-based alloys.This study investigated the Mg-Ho-Fe(MHF)ternary alloy prepared using the vacuum induction melting technique.X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),pressure-composition-temperature(PCT),and differ-ential scanning calorimetry(DSC)were used to analyze the alloy's phase transitions,microstructure,thermodynamics,and kinetic properties.The results reveal that the Mg98Ho1.5Fe0.5 alloy forms a solid solution with Ho and Fe in the magnesium matrix.Upon hydrogen absorption,the activated alloy transforms into a mixture of Mg/MgH2 phases and nanoscale HoH2 phases.Notably,only the MgH2 phase decomposes during hydrogen desorption,while the HoH2 phase remains unchanged,exhibiting a pos-itive catalytic effect.The alloy demonstrates excellent hydrogen absorption kinetics,achieving a capacity of 5.56 wt％H2 within 10 min at 360 ℃,owing to the combined catalytic effects of Ho and Fe.The activation energy for hydrogen desorption is found to be 135.87 kJ/mol,which is lower than that of the activation energies of pure MgH2 and MgFe alloys,indicating an enhancement in desorption kinetics.Moreover,the enthalpy and entropy changes for hydrogen absorption and desorption are determined to be-70.51 kJ/mol H2,-125.62 J/(K·mol)H2,72.83 kJ/mol H2,and 128.95 J/(K·mol)H2,respectively.Furthermore,it is worth noting that the thermodynamic properties of the alloy are improved due to the catalytic effect of Ho and Fe.

Rare earthsMagnesium-based hydrogen storageHydrogen storage thermodynamicsHydrogen storage kinetics

Jinming Liu、Hui Yong、Yang Zhao、Shuai Wang、Yiwan Chen、Baosheng Liu、Jifan Hu、Yanghuan Zhang

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College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,030024,China

China Institute of Ocean Engineering(Tsing Tao),Qingdao,266000,China

Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources,Inner Mongolia University of Science and Technology,Baotou,014010,China

Fundamental Research Program of Shanxi ProvinceFundamental Research Program of Shanxi ProvinceScientific and Technological Innovation Programs of Higher Education Institutions in ShanxiScientific and Technological Innovation Programs of Higher Education Institutions in ShanxiNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaKey Scientific Research Project in Shanxi Province

2022030212111932022030212111902022L2912022L274517610325187112552071227202102050201003

2024

10.1016/j.jre.2023.08.019

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(9)
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