Hydrogen storage properties of La1-xPrxMgNi3.6Co0.4（x=0-0.4） alloys with annealing treatment  

作　　者：Ting-Ting Zhai Sheng Xu Tai Yang Ze-Ming Yuan Yang-Huan Zhang 

机构地区：[1]Department of Functional Material Research,Central Iron and Steel Research Institute,Beijing 100081,China [2]College of Science,Northeastern University,Shenyang 110819,China

出　　处：《Rare Metals》2019年第9期871-876,共6页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundations of China(Nos.51161015 and 51371094);the Natural Science Foundation of Inner Mongolia, China (No. 2011ZD10)

摘　　要：The as-cast RE-Mg-Ni-b ased AB2-type La1-xPrxMgNi3.6Co0.4(x=0-0.4)alloys were prepared by vacuum induction melting followed by annealing treatment.The phase composition and structure were characterized by X-ray diffraction(XRD)and scanning electron microscope(SEM).The results show that LaMgNi4 and LaNi5 coexist in as-cast alloys,but only LaMgNi4 is detected in the annealed alloys.The morphology of annealed alloys is more homogeneous than that of as-cast alloys.The gaseous hydrogen storage and electrochemical properties were investigated by pressure-composition isotherm(P-C-T)and electrochemical measurements.The P-C-T curves of annealed alloys show flatter and wider pressure plateaus corresponding to absorption/desorption pressure plateaus of LaMgNi4 hydride.But the maximum hydrogen storage content of annealed alloys is lower than that of as-cast alloys.In consideration of the electrochemical properties,the annealed La0.8Pr0.2MgNi3.6Co0.4alloy exhibits a maximum discharge capacity of354.2 mAh·g-1.The as-cast RE-Mg-Ni-b ased AB2-type La1-xPrxMgNi3.6Co0.4（x=0-0.4）alloys were prepared by vacuum induction melting followed by annealing treatment.The phase composition and structure were characterized by X-ray diffraction（XRD）and scanning electron microscope（SEM）.The results show that LaMgNi4 and LaNi5 coexist in as-cast alloys,but only LaMgNi4 is detected in the annealed alloys.The morphology of annealed alloys is more homogeneous than that of as-cast alloys.The gaseous hydrogen storage and electrochemical properties were investigated by pressure-composition isotherm（P-C-T）and electrochemical measurements.The P-C-T curves of annealed alloys show flatter and wider pressure plateaus corresponding to absorption/desorption pressure plateaus of LaMgNi4 hydride.But the maximum hydrogen storage content of annealed alloys is lower than that of as-cast alloys.In consideration of the electrochemical properties,the annealed La0.8Pr0.2MgNi3.6Co0.4alloy exhibits a maximum discharge capacity of354.2 mAh·g-1.

关 键 词：LaMgNi4 P-C-T ANNEALING treatment HYDROGEN STORAGE properties 

分 类 号：TG156.2[金属学及工艺—热处理] TG146.45[金属学及工艺—金属学]