Catalytic effects of V-and O-species derived from PrF_(3)/V_(2)C for efficient hydrogen storage in MgH_(2)  

作　　者：Zhenluo Yuan Yuhang Wang Xiuxiu Zhang Shuyan Guan Xiaojiao Wang Liqiang Ji Qiuming Peng Shumin Han Yanping Fan Baozhong Liu 

机构地区：[1]College of Chemistry and Chemical Engineering,Henan Polytechnic University,Jiaozuo 454000,China [2]Henan Famous Diamond Co.,Ltd.,Mengzhou 454763,China [3]School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China [4]Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China [5]State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China

出　　处：《Nano Research》2024年第8期7117-7125,共9页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.U22A20120,52071135,51871090,and U1804135);the Natural Science Foundation of Hebei Province for Innovation Groups Program(No.C2022203003);Fundamental Research Funds for the Universities of Henan Province(No.NSFRF220201).

摘　　要：Magnesium hydride(MgH_(2))is considered as an ideal hydrogen storage material with excellent hydrogen capacity,but the slow kinetics impedes its application.Herein,an efficient additive of V2C MXene-anchored PrF_(3) nanoparticles(PrF_(3)/V_(2)C)was synthesized,which presents excellent catalytic effect in improving the reversibility and stability of hydrogen storage in MgH_(2).The initial dehydrogenation temperature of the 5 wt.% PrF_(3)/V_(2)C-containing MgH_(2)(182℃) is 105℃ lower than that of pure MgH_(2),and 6.5 wt.%hydrogen is rapidly released from 5 wt.%PrF_(3)/V_(2)C-added MgH_(2)sample in 6 min at 240℃.In addition,5 wt.%PrF_(3)/V_(2)C-containing MgH_(2) sample possesses outstanding reversible hydrogen storage capability of 6.5 wt.% after 10 cycles of dehydrogenation and hydrogenation.Microstructure analysis shows that the introduction of Pr improves the stability of V-species(V^(0)and V^(2+))and O-species(lattice oxygen(OL)and vacancy oxygen(OV))formed during ball milling,promotes the interaction between V-species and O-species,and enhances their reversibility,which contributes to the significant improvement in re/dehydrogenation reversibility and cycling stability of MgH_(2).This study provides effective ideas and strategies for the purpose of designing and fabricating high-efficient catalysts for solid-state hydrogen storage materials.

关 键 词：hydrogen storage materials MgH_(2) DEHYDROGENATION REVERSIBILITY cyclic stability 

分 类 号：O64[理学—物理化学]