Graphene-loaded nickel−vanadium bimetal oxides as hydrogen pumps to boost solid-state hydrogen storage kinetic performance of magnesium hydride

作     者：Dong-qiang GAO Fu-ying WU Zhi ZHANG Zi-chuan LU Ren ZHOU Hu ZHAO Liu-ting ZHANG 高东强;吴富英;张智;路紫川;周任;赵虎;张刘挺

作者机构：School of Energy and PowerJiangsu University of Science and TechnologyZhenjiang 212003China Instrumental Analysis CenterJiangsu University of Science and TechnologyZhenjiang 212003China School of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore 639798Singapore 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2024年第34卷第8期

页      面：2645-2657页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：the financial support from the National Natural Science Foundation of China(No.51801078) 

主　　题：hydrogen storage properties MgH_(2) graphene-loaded Ni−V bimetal oxides catalytic mechanism 

摘      要：To modify the thermodynamics and kinetic performance of magnesium hydride(MgH_(2))for solid-state hydrogen storage,Ni_(3)V_(2)O_(8)-rGO(rGO represents reduced graphene oxide)and Ni_(3)V_(2)O_(8)nanocomposites were prepared by hydrothermal and subsequent heat *** beginning hydrogen desorption temperature of 7 wt.%Ni_(3)V_(2)O_(8)-rGO modified MgH_(2)was reduced to 208°C,while the additive-free MgH_(2)and 7 wt.%Ni_(3)V_(2)O_(8)doped MgH_(2)appeared to discharge hydrogen at 340 and 226°C,respectively.A charging capacity of about 4.7 wt.%H_(2)for MgH_(2)+7 wt.%Ni_(3)V_(2)O_(8)-rGO was achieved at 125°C in 10 min,while the dehydrogenated MgH_(2)took 60 min to absorb only 4.6 wt.%H_(2)at 215°*** microstructure analysis confirmed that the in-situ generated Mg_(2)Ni/Mg_(2)NiH4 and metallic V contributed significantly to the enhanced performance of MgH_(2).In addition,the presence of rGO in the MgH_(2)+7 wt.%Ni_(3)V_(2)O_(8)-rGO composite reduced particle aggregation tendency of Mg/MgH_(2),leading to improving the cyclic stability of MgH_(2)during 20 cycles.