Tuning microstructures of Mg-Ce-Ni hydrogen storage alloys via Cu and carbon nanotube additions  

作　　者：Linlin Zhang Liang Xiong Bingyang Gao Qingyun Shi Ying Wang Zhiya Han Zhenhua Zhang Chunli Wang 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,Hefei 230026,China [3]Purification Equipment Research Institute of CSIC,Handan 056002,China

出　　处：《Nano Research》2024年第8期7203-7211,共9页纳米研究（英文版）

基　　金：funded by the 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：Mg-based alloys are regarded as highly promising materials for hydrogen storage.Despite significant improvements of the properties for Mg-based alloys,challenges such as slow hydrogen absorption/desorption kinetics and high thermodynamic stability continue to limit their practical application.In this study,to assess hydrogen storage alloys with enhanced properties,incorporating both internal microstructure modulation through the preparation of amorphous/nanocrystalline structures and surface property enhancement with the addition of Cu and carbon nanotubes(CNTs),the kinetic properties of activation and hydrogenation,thermodynamic properties,and dehydrogenation kinetics are tested.The results reveal a complementary interaction between the added Cu and CNTs,contributing to the superior hydrogen storage performance observed in sample 7A-2Cu-1CNTs with an amorphous/nanocrystalline structure compared to the other experimental samples.Additionally,the samples are fully activated after the initial hydrogen absorption and desorption cycle,demonstrating outstanding hydrogenation kinetics under both high and low temperature experimental conditions.Particularly noteworthy is that the hydrogen absorption exceeds 1.8 wt.% within one hour at 333 K.Furthermore,the activation energy for dehydrogenation is decreased to 64.71 kJ·mol^(–1).This research may offer novel insights for the design of new-type Mg-based hydrogen storage alloys,which possess milder conditions for hydrogen absorption and desorption.

关 键 词：Mg-Ni-Ce alloy hydrogen storage amorphous/nanocrystalline structure kinetics Cu and carbon nanotubes(CNTs)codoping 

分 类 号：TG14[一般工业技术—材料科学与工程]