Hydrogen storage performance of LaNi_(3.95)Al_(0.75)Co_(0.3) alloy with different preparation methods  

作　　者：Lijun Lv Jian Lin Guo Yang Zhaowei Ma Linhua Xu Xiujie He Xingbo Han Wei Liu 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai,201800,China [2]Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai,519082,Guangdong,China

出　　处：《Progress in Natural Science:Materials International》2022年第2期206-214,共9页自然科学进展·国际材料（英文版）

基　　金：the Youth Innovation Promotion Association,Chinese Academy of Sciences(Nos.2019263).

摘　　要：Rare-earth AB5-type La–Ni–Al hydrogen storage alloys are widely studied due to their extensive application potentials in hydrogen isotope storage,hydrogen isotope isolation and hydrogen compressors,etc.Good hydriding/dehydriding kinetics,easily activation,high reversibility are important factors for their practical application.However,their overall hydrogen storage performance,especially plateau pressure and hydrogen absorption/desorption durability need to be further optimized.In this study,the microstructures and the hydrogen storage properties of as-cast,annealed,and melt-spun LaNi_(3.95)Al_(0.75)Co_(0.3) alloys were investigated.The experimental results of XRD and SEM showed that all alloys contained a pure CaCu5 type hexagonal structure LaNi_(4)Al phase.The cell volume increased in an order of annealed>melt-spun>as-cast,resulting in a lower hydrogen absorption/desorption plateau pressure and a more stable hydride phase.The hydrogen storage capacity of three alloys was almost the same.The slope factor of the annealed and melt-spun alloys is smaller than the as-cast alloy,indicating that heat-treatment process can make the alloys more uniform.For the cycle stability of the alloys,the hydrogen absorption rate of the annealed alloy and melt-spun alloy was much faster than that of the as-cast alloy after 500 cycles.The melt-spun alloy showed high pulverization resistance during hydrogen absorption/desorption,and exhibited an excellent cycling retention of 99%after 500 cycles,suggesting that melt-spinning process can enhance the cycle stability and improve the cycle life of the alloy.

关 键 词：Hydrogen storage alloy LaNi4.25Al0.75 Annealing process MELT-SPINNING 

分 类 号：TG139.7[一般工业技术—材料科学与工程]