纳米晶Al–Cr–Cu–Fe–Ni高熵合金的显著储氢性能

Yogesh Kumar Yadav; Mohammad Abu Shaz; Thakur Prasad Yadav

doi:10.1007/s12613-025-3266-8

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Yogesh Kumar Yadav, Mohammad Abu Shaz, and Thakur Prasad Yadav, Notable hydrogen storage properties in nanocrystalline Al–Cr–Cu–Fe–Ni high entropy alloy, Int. J. Miner. Metall. Mater., 32(2025), No. 11, pp.2723-2732. https://doi.org/10.1007/s12613-025-3266-8

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纳米晶Al–Cr–Cu–Fe–Ni高熵合金的显著储氢性能

摘要: 本研究探讨了以正己烷为过程控制剂，采用高能球磨机从元素粉末中合成单相纳米晶机械合金化Al–Cr–Cu–Fe–Ni高熵合金（HEA）的储氢机理。研磨40 h后获得的材料是纳米晶体，表现出体心立方（BCC）相，晶格参数为0.289 nm。纳米晶Al–Cr–Cu–Fe–Ni HEA在300°C和50 atm氢气压力下表现出显著的储氢能力：3 min内吸收2.1wt%的H₂，在6 min内解吸约1.6wt%的H₂。这些快速的吸收和解吸过程突出了合金吸收和释放氢的效率。此外，该合金在25次循环中仅损失了0.2wt%的氢容量，表现出良好的循环稳定性。优异的循环稳定性和储氢/释放的快速动力学使纳米晶Al–Cr–Cu–Fe–Ni HEA成为储氢应用的可行选择。

Notable hydrogen storage properties in nanocrystalline Al–Cr–Cu–Fe–Ni high entropy alloy

Abstract: The hydrogen storage mechanism of a single-phase nanocrystalline mechanically alloyed Al–Cr–Cu–Fe–Ni high-entropy alloy (HEA) was investigated in this study. The alloys were synthesized from the elemental powders using high-energy attritor ball mill with hexane as the process control agent. The material obtained after 40 h of milling was nanocrystalline and exhibited body-centered cubic (BCC) phase with a lattice parameter of 0.289 nm. The nanocrystalline Al–Cr–Cu–Fe–Ni HEA demonstrated remarkable hydrogen storage capacity at 300°C and 50 atm hydrogen pressure, absorbing 2.1wt% of hydrogen within 3 min and desorbing approximately 1.6wt% of hydrogen in 6 min. These rapid absorption and desorption processes highlighted the efficiency of the alloy for hydrogen uptake and release. Additionally, the alloy exhibited good cyclic stability, with a loss of only 0.2wt% of its hydrogen capacity across 25 cycles. The exceptional cycle stability and rapid kinetics of hydrogen storage and release make the nanocrystalline Al–Cr–Cu–Fe–Ni HEA a viable choice for hydrogen storage applications.

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