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Bullet-like vanadium-based mofs as a highly active catalyst for promoting the hydrogen storage property in MgH_(2)

International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 44-53页

作者： Zhiyu Lu Jiahuan He Mengchen Song Yan Zhang Fuying Wu Jiaguang Zheng Liuting Zhang Lixin Chen School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China Instrumental Analysis Center Jiangsu University of Science and TechnologyZhenjiang 212003China State Key Laboratory of Silicon Materials Department of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

The practical application of magnesium hydride(MgH_(2))was seriously limited by its high desorption temperature and slow desorp-tion *** this study,a bullet-like catalyst based on vanadium related mofs(mofs-V)was successfully synthesized and doped with MgH_(2) by ball milling to improve its hydrogen storage *** analysis demonstrated that the as-synthesized mofs was consisted of V_(2)O_(3) with a bullet-like *** adding 7wt%mofs-V,the initial desorption temperature of MgH_(2) was reduced from 340.0 to 190.6℃.Besides,the MgH_(2)+7wt%mofs-V composite released 6.4wt%H_(2) within 5 min at 300℃.Hydrogen uptake was started at 60℃under 3200 kPa hydrogen pressure for the 7wt%mofs-V containing *** desorption and absorption apparent activity energies of the MgH_(2)+7wt%mofs-V composite were calculated to be(98.4±2.9)and(30.3±2.1)kJ·mol^(-1),much lower than(157.5±3.3)and(78.2±3.4)kJ·mol^(−1) for the as-prepared MgH_(2).The MgH_(2)+7wt%mofs-V composite exhibited superior cyclic *** the 20 cycles isothermal dehydrogenation and hydrogenation experiments,the hydrogen storage capacity stayed almost unchanged.X-ray diffraction(XRD)and X-ray photoelectron spectrometer(XPS)measurements confirmed the presence of metallic vanadium in the MgH_(2)+7wt%mofs-V composite,which served as catalytic unit to markedly improve the hydrogen storage properties of Mg/MgH_(2) system.

关键词： hydrogen storage magnesium hydrides vanadium based mofs catalytic mechanism

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