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易倍体育官网:易倍体育官网-研究生卢志禹等的研究成果“Bullet-like vanadium-based MOFs as a highly active catalyst for promoting the hydrogen storage property in MgH2”在《 International Journal of Minerals, Metallurgy and Materials》上发表

发布时间:2021-12-30动态浏览次数:161

近期,易倍体育官网-研究生卢志禹等的研究成果Bullet-like vanadium-based MOFs as a highly active catalyst for promoting the hydrogen storage property in MgH2在《 International Journal of Minerals, Metallurgy and Materials》上发表。

论文简介如下:

The practical application of magnesium hydride (MgH2) was seriously limited by its high desorption temperature and slow desorption kinetics. In this study, a bullet-like catalyst based on vanadium related MOFs (MOFs-V) was successfully synthesized and doped with MgH2 by ball milling to improve its hydrogen storage performance. Microstructure analysis demonstrated that the as-synthesized MOFs was consisted of V2O3 with a bullet-like structure. After adding 7wt% MOFs-V, the initial desorption temperature of MgH2 was reduced from 340.0°C to 190.6°C. Besides, the MgH2+7wt% MOFs-V composite released 6.4wt% H2 within 5 min at 300°C. Hydrogen uptake was started at 60°C under 32 bar hydrogen pressure for the 7wt% MOFs-V containing sample. The desorption and absorption apparent activity energy of the MgH2+7wt% MOFs-V composite was calculated to be 99.6±12.6 kJ mol-1 and 32.8±3.9 kJ mol-1, much lower than154.5±16.3 kJ mol-1 and 81.1±2.4 kJ mol-1 for the as-prepared MgH2. The MgH2+7wt% MOFs-V composite exhibited superior cyclic property. During 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 MgH2+ 7wt% MOFs-V composite, which served as catalytic unit to markedly improve the hydrogen storage properties of Mg/MgH2 system.

全文下载:http://ijmmm.ustb.edu.cn/en/article/doi/10.1007/s12613-021-2372-5


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