LaVO_(4)prepared by a high-yield method for superior catalysis to the hydrogen storage of MgH_(2)  

作　　者：Meihong Wu Mingxia Gao Shanqing Qu Yongfeng Liu Wenping Sun Xin Zhang Chu Liang Xiaoyu Zhang Yaxiong Yang Hongge Pan 

机构地区：[1]State Key Laboratory of Silicon and Advanced Semiconductor Materials,Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province&School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,PR China [2]Institute of Science and Technology for New Energy,Xi'an Technological University,Xi'an 710021,PR China [3]Zhejiang Carbon Neutral Innovation Institute,Zhejiang University of Technology,Hangzhou 310014,PR China

出　　处：《Journal of Magnesium and Alloys》2025年第2期613-625,共13页镁合金学报(英文)

基　　金：supported by the National Natural Science Foundation of PR China(Nos.52071287,52125104 and 52072342);Natural Science Foundation of Zhejiang Province,PR China(No.LZ23E010002).

摘　　要：MgH_(2)is a promising solid-state hydrogen storage material.However,its high thermodynamics and sluggish kinetics hinder its practical application.Catalytic strategy is effective in improving its kinetic performance.Nevertheless,the highly efficient catalysts or additives are normally of low-yield in fabrication with high cost.In this work,a novel structural LaVO_(4)fabricated by a low-cost method of spraying dry followed by a calcination is used as a catalytic additive for the hydrogen storage of MgH_(2).With an optimized addition of LaVO_(4),the overall hydrogen storage performances of MgH_(2)are significantly improved.An onset dehydrogenation temperature of only 183℃is obtained after an initial activation of dehydrogenation and hydrogenation.The system can desorb 5.7 wt%H_(2)at 250℃within 10 min and maintains a dehydrogenation capacity of 5.0 wt%H_(2)after 50 cycles.It is found that LaVO_(4)is transferred to lanthanum hydride and metallic vanadium in the initial dehydrogenation process,the former acts as a highly effective catalyst for the hydrogen storage of MgH_(2)and the latter undergoes reversible hydrogenation and dehydrogenation in the subsequent cycles.The structural design of the catalyst and its scalable fabrication are highly valuable in realizing the practical application of catalytic strategy for the hydrogen storage of MgH_(2).

关 键 词：Magnesium hydride Hydrogen storage properties Catalysis Bimetallic oxide Spray drying 

分 类 号：O643.36[理学—物理化学]