Decorating crystalline YFe_(2-x)Al_(x) on the Mg_(60)La_(10)Ni_(20)Cu_(10) amorphous alloy as “hydrogen pump” to realize fast de/hydrogenation  

作　　者：L.J.Huang H.Wang L.Z.Ouyang M.Zhu H.J.Lin 

机构地区：[1]School of Materials Science and Engineering,Key Laboratory of Advanced Energy Storage Materials of Guangdong Province,South China University of Technology,Guangzhou 510641,China [2]Institute of Advanced Wear&Corrosion Resistance and Functional Materials,Jinan University,Guangzhou 510632,China

出　　处：《Journal of Materials Science & Technology》2024年第6期72-79,共8页材料科学技术（英文版）

基　　金：supported by the National Key R&D Program of China(No.2022YFB3803801);the National Natural Science Foundation of China(Grant Nos.52271214,51727801,and 52071157);the Fund for Innovative Research Groups of the National Natural Science Foundation of China(Grant No.51621001).

摘　　要：Mg-based amorphous alloys are one of the potential hydrogen storage materials but suffer from sluggish dehydrogenation/hydrogenation(de/hydrogenation)kinetics.In this work,as a new strategy,a hydrogen pump is built on the surface of amorphous alloys to solve this problem.By milling crystalline YFe_(2-x)Al_(x) hydrogen storage alloy with Mg_(60)La_(10)Ni_(20)Cu_(10) amorphous alloy,fine crystalline particles were seeded on amorphous alloy powder to form a“strawberry”structure.According to the TEM observation,a metallurgical bonding boundary formed between the Mg-based amorphous matrix and the Y-Fe-Al crystalline alloy.By microstructure and de/hydrogenation kinetics investigation,the“hydrogen pump”effect of the seeded crystalline alloy was confirmed,which makes it much easier for the hydrogen to dissociate on and diffuse through the surface of the Mg-based amorphous alloy.With such effect,the H absorption rate of Mg_(60)La_(10)Ni_(20)Cu_(10) amorphous alloy became almost eight times faster and it absorbs ~2.8 wt.% in 1 h at 130℃ under 4.5 MPa-H_(2).Further,fast hydrogenation can even achieve at 70℃ and the low-temperature dehydrogenation kinetics of the amorphous hydride can be also greatly promoted.The present work proves that surface modification is of great importance for obtaining Mg-based amorphous alloy with ideal hydrogen storage performance.

关 键 词：Hydrogen storage Mg-based amorphous alloy Hydrogen pump Composite structure 

分 类 号：TG146.15[一般工业技术—材料科学与工程]