Rare-earth AB5-type La-Ni-Al hydrogen storage alloys are widely studied due to their extensive application po-tentials 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 LaNi3.95Al0.75Co0.3 alloys were investigated.The experimental results of XRD and SEM showed that all alloys contained a pure CaCu5 type hexagonal structure LaNi4Al phase.The cell volume increased in an order of annealed＞melt-spun＞as-cast,resulting in a lower hydrogen ab-sorption/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.

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

Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai,201800,China;Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai,519082,Guangdong,China

自然科学进展·国际材料（英文）

[1]Lijun Lv;Jian Lin;Guo Yang;Zhaowei Ma;Linhua Xu;Xiujie He;Xingbo Han;Wei Liu-.Hydrogen storage performance of LaNi3.95Al0.75Co0.3 alloy with different preparation methods)[J].自然科学进展·国际材料（英文）,2022(02):206-214

LaNi3,95Al0,75Co0,tentials,hydriding,dehydriding,CaCu5,LaNi4Al

Hydrogen,storage,performance,different,preparation,methods,Rare,earth,AB5,type,hydrogen,alloys,widely,studied,due,their,extensive,application,isotope,isolation,compressors,etc,Good,kinetics,easily,activation,high,reversibility,important,factors,practical,However,overall,especially,plateau,pressure,absorption,desorption,durability,need,be,further,optimized,In,this,study,microstructures,properties,cast,annealed,melt,spun,were,investigated,experimental,results,showed,that,contained,pure,hexagonal,phase,volume,increased,order,resulting,lower,more,stable,hydride,capacity,three,was,almost,same,slope,smaller,than,indicating,heat,treatment,process,can,make,uniform,For,stability,rate,much,faster,after,cycles,pulverization,resistance,during,exhibited,excellent,cycling,retention,suggesting,spinning,enhance,improve,life

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