Nanocrystalline High Entropy Alloys with Ultrafast Kinetics and High Storage Capacity for Large-Scale Room-Temperature-Applicable Hydrogen Storage  

作　　者：Long Luo Huimin Han DianChen Feng Wei Lv Liangpan Chen Lirong Li Tingting Zhai Suxia Liu Shiyang Sun Yiming Li Wenli Pei Junjie Cui Yongzhi Li 

机构地区：[1]School of Rare Earth Research and Development,Inner Mongolia University of Science and Technology,Baotou 014010 [2]School of Materials Science and Engineering,Northeastern University,Shenyang 110819 [3]Baotou Materials Research Institute of Shanghai Jiao Tong University,Baotou 014010 [4]School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010 [5]Institute of Energy Power Innovation,North China Electric Power University,Beijing 102206 [6]Analytical and Testing Center,Inner Mongolia University of Science and Technology,Baotou 014010

出　　处：《Renewables》2024年第2期138-149,共12页可再生能源（英文）

基　　金：supported by the Natural Science Foundation of Inner Mongolia,China(grant nos.2022MS05011,2020LH01006,and 2022FX02);the National Natural Science Foundation of China(grant nos.52261041 and 51961032);the Major Science and Technology Project of Inner Mongolia(grant no.2021ZD0029);the Fundamental Research Funds for Inner Mongolia University of Science&Technology(grant no.2023QNJS119).

摘　　要：High-entropy alloys(HEAs)are a promising solution for large-scale hydrogen storage(H-storage)and are therefore receiving increasing attention from the materials science community.In this study,we systematically investigated the microstructures and H-storage properties of V_(35)Ti_(35)Cr_(10) Fe_(10)M_(10)(M=Mn,Co,Sc,or Ni)HEAs prepared by arcmelting.The cast HEAs were found to be nanocrystalline.The crystal lattice parameters and hydrogen absorption energies of the alloys were calculated using density functional theory(DFT)calculations.The alloys can be fully activated in just one cycle of hydrogen absorption/desorption under mild conditions,after which they reach hydrogen absorption saturation in approximately 100 s at ambient temperature.The hydrogenation kinetics of the HEAs are approximately five times higher than that of conventional solid-solution alloys with a body-centered cubic(BCC)structure.By performing in-situ hydriding differential scanning calorimetry in combination with DFT calculations,we revealed that the alloys are more susceptible to hydrogenation than traditional BCC structural alloys.The H-storage capacity of V_(35)Ti_(35)Cr_(10) Fe_(10)M_(10) alloys at ambient temperature was higher than that of HEAs reported in the literature.Quasi-in-situ X-ray diffraction characterization of the HEAs’hydrogenation revealed a phase transition process from a BCC to facecentered cubic,passing through a pseudo-BCC structure.Our work introduces a new perspective for designing alloys with ultrafast hydrogen absorption kinetics and high capacity for large-scale,room-temperature-applicable H-storage.

关 键 词：high entropy alloys in-situ hydriding solid-state hydrogen storage NANOCRYSTALS kinetic properties 

分 类 号：TG139[一般工业技术—材料科学与工程]