Enhancing Mg-Li alloy hydrogen storage kinetics by adding molecular sieve via friction stir processing  

作　　者：Bin Li Xuan Sun Hao Chen Yan Yang Qun Luo Xiaohua Yang Yu'an Chen Guobing Wei Qian Li Fusheng Pan 

机构地区：[1]National Engineering Research Center for Magnesium Alloys&College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [2]State Key Laboratory of Advanced Special Steel&School of Materials Science and Engineering&Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai University,Shanghai 200444,China [3]School of Mechanical Engineering,Sichuan University,Chengdu 610065,China

出　　处：《Journal of Materials Science & Technology》2024年第13期45-54,共10页材料科学技术（英文版）

基　　金：Fundamental Research Funds for Central Universities(No.2022CDJKYJH028);National Natural Science Foundation of China(No.52271091);Chongqing Special Key Project of Technology Innovation and Application Development,China(No.cstc2019jscx-dxwtBX0016).

摘　　要：Mg-Li alloy is a lightweight hydrogen storage material with high hydrogen capacity,but its poor kinetics limited its practical applications.In this work,MCM-22 molecular sieve was added to Mg-Li alloy by friction stir processing(FSP)as the catalyst to enhance the kinetic properties of Mg-Li alloy(denoted as Mg-Li-MCM-22).The resulting Mg-Li-MCM-22 possesses the reversible hydrogen storage capacity of ca.6 wt.%and can release 5.62 wt.%hydrogen within 50 min at 623 K,showing improved kinetics.The Chou model and Johnson-Mehl-Avrami-Kolmogorov(JMAK)model calculations reveal that the lattice defects generated by FSP improve the kinetics of hydrogen adsorption/desorption.The pinning effect of MCM-22 particles produces more grain boundaries and dislocations,thus,increasing the diffusion rate of hydrogen atoms and providing more nucleation sites,therefore,reducing the dehydrogenation activation energy.This work provides a new strategy for the preparation of hydrogen storage materials.

关 键 词：Mg-Li alloy Hydrogen storage Hydriding/dehydriding reaction kinetics Friction stir processing Molecular sieve 

分 类 号：TG453.9[金属学及工艺—焊接] TG146.21[一般工业技术—材料科学与工程]