Effect of Y,Al Co‑Doping on Hydrogen Storage Properties of La–Mg–Ni‑Based Alloys  

作　　者：Guanjiu Wu Yichao Xie Yuan Li Qing Wang Chenfeng Fan Wenfeng Wang Lu Zhang Shumin Han 

机构地区：[1]Hebei Key Laboratory of Applied Chemistry,Yanshan University,Qinhuangdao 066004,China [2]State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第8期1399-1410,共12页金属学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2022YFB3803800);the National Natural Science Foundation of China(Nos.51971197 and 52071281);the Basic Innovation Research Project in Yanshan University(No.2022LGZD004);the China Postdoctoral Science Foundation(No.2023M742945);the Postdoctoral Research Project of Hebei Province(No.B2023003023);the Subsidy for Hebei Key Laboratory of Applied Chemistry after Operation Performance(No.22567616H);the Special Project for Local Science and Technology Development Guided by the Central Government of China(No.236Z1406G).

摘　　要：La–Mg–Ni-based hydrogen storage alloys have excellent hydrogen storage properties.This work reports the hydrogen storage performance of a series of A_(2)B_(7)-type La_(0.96)Mg_(0.04)N_(i3.34)Al_(0.13)alloy and La_(0.96-x)Y_(x)Mg_(0.04)Ni_(3.47–0.6x)Al_(0.6x)(x=0,0.22,0.33,0.44)alloys,and explores the effect of Y and Al element combined substitution on the microstructure and hydrogen storage performance of A_(2)B_(7)-type La–Mg–Ni-based alloys.The alloys are composed of Ce_(2)Ni_(7)phase and LaNi_(5)phase.With the increase of x,the cell volume of Ce_(2)Ni_(7)phase decreases,while that of LaNi_(5)phase increases,indicating that Y atom mainly enters Ce_(2)Ni_(7)phase and Al atom mainly enters LaNi_(5)phase.An appropriate amount of co-substitution increases the hydrogen storage capacity and reduces the hydrogen absorption/desorption plateau pressure hysteresis of the alloy.When x=0.44,the hydrogen storage capacity of the alloy is 1.449 wt%,and the hysteresis coefficient is 0.302.The cell volume of Ce_(2)Ni_(7)phase and LaNi_(5)phase expands to different degrees after 20 absorption/desorption cycles.With the increase of x,the volume expansion rate decreases,and the cycle capacity retention rate also gradually decreases.This is related to the amorphization of Ce_(2)Ni_(7)phase.When x=0.22,the capacity retention rate of the alloy is 91.4%.

关 键 词：La-Mg-Ni-based alloys Gas-phase hydrogen storage performance Ce_(2)Ni_(7)phase LaNi_(5)phase Capacity retention rate 

分 类 号：TG146.22[一般工业技术—材料科学与工程]