首页|Enhancing Mg-Li alloy hydrogen storage kinetics by adding molecular sieve via friction stir processing
Enhancing Mg-Li alloy hydrogen storage kinetics by adding molecular sieve via friction stir processing
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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.
Bin Li、Xuan Sun、Hao Chen、Yan Yang、Qun Luo、Xiaohua Yang、Yu'an Chen、Guobing Wei、Qian Li、Fusheng Pan
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National Engineering Research Center for Magnesium Alloys & College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China
State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering & Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai University,Shanghai 200444,China
School of Mechanical Engineering,Sichuan University,Chengdu 610065,China
中央高校基本科研业务费专项国家自然科学基金Chongqing Special Key Project of Technology Innovation and Application Development,China
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