MOF-derived Cu based materials as highly active catalysts for improving hydrogen storage performance of Mg-Ni-La-Y alloys  

作　　者：Yufei Liu Liang Xiong Bingyang Gao Qingyun Shi Ying Wang Zhiya Han Zhenhua Zhang Zhaowei Ma Limin Wang Yong Cheng 

机构地区：[1]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China [2]School of Applied Chemistry and Engineering,University of Science and Technology of China(USTC),Hefei 230026,China [3]Purification Equipment Research Institute of CSIC,Handan 056002,China [4]Shengyuan(Xiamen)Hydrogen Energy Research Institute Co.,Ltd.,Xiamen 361000,China

出　　处：《Chinese Chemical Letters》2024年第12期527-533,共7页中国化学快报（英文版）

基　　金：funded by National Key R&D Program of China(No.2021YFB4000604);the National Natural Science Foundations of China(No.52261041);Key R&D projects of Jilin Provincial Science and Technology Development Plan(No.20230201125GX);Youth Growth Science and Technology Program of Jilin Province(No.20220508001RC);Youth Innovation Promotion Association CAS(No.2022225);Independent Research Project of the State Key Laboratory of Rare Earth Resources Utilization,and Changchun Institute of Applied Chemistry,Chinese Academy of Sciences(No.110000RL86)。

摘　　要：Higher initial(de)hydrogenation temperature and sluggish kinetics are the main bottlenecks to develop Mg-based hydrogen storage alloys with high hydrogen capacity.One of the effective methods of solv ing these problems is introducing additives to enhance(de)hydrogenation kinetics and decrease par ticle sizes to lower(de)hydrogenation temperatures.In this work,Mg85-Ni10-La4.5-Y0.5 alloy doped with Cu@C nanoparticles is prepared,which could enhance(de)hydrogenation kinetics via introducing Cu nanoparticles as a catalyst and reduce the alloy particle sizes via acting as a grinding agent to lowe(de)hydrogenation temperature.The results indicate the dehydrogenation temperature of the modified Mg85-Ni10-La4.5-Y0.5 composite could be decreased to 308.5℃,absorb 4.73 wt%H_(2)at 220℃ within1 min and release 5.01 wt%H_(2)within 4 min at 300℃.Moreover,the capacity retention could be main tained around 98.8%after 10 cycles at 300℃,superior than those of Mg85-Ni10-La4.5-Y0.5 and milled Mg85-Ni10-La4.5-Y0.5.DFT results and characterizations suggest that in-situ formed Mg_(2)Cu could acceler ate the dissociation of Mg-H bonds and the presence of amorphous carbon in Mg-Ni-La-Y-Cu system wil further synergistically improve the(de)hydrogenation kinetics of Mg85-Ni10-La4.5-Y0.5.Reduced particle sizes under the aid of carbon frameworks also help introduce boundaries of the particles and shorten hydrogen diffusion pathways.

关 键 词：Mg-Ni-La-Y alloy Cu@C Catalyst Kinetics Hydrogen storage 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TQ426[金属学及工艺—合金]