近期,我院教师张刘挺,研究生颜年华、孙泽、陆雄、Farai Michael Nyahuma等的研究成果“Remarkably improved hydrogen storage properties of carbon layers covered nanocrystalline Mg with certain air stability”在《International Journal of Hydrogen Energy》上发表。
发布时间: 2020-03-24 浏览次数: 10

近期,我院教师张刘挺,研究生颜年华、孙泽、陆雄、Farai Michael Nyahuma等的研究成果Remarkably improved hydrogen storage properties of carbon layers covered nanocrystalline Mg with certain air stability在《International Journal of Hydrogen Energy》上发表。

论文简介如下:

Differentnanocrystalline magnesium with carbon layers were successfully synthesized via a facile wet-chemical ball milling method for 20, 30 and 40 hours, respectively. Based on Scherrerformulaand X-ray diffraction results, the average crystallite size of all the three samples was below 30 nm.TEM observations showed that the hydrogenated Mg particles were covered with carbon layers.Moreover, the 40 hours ball milled Mg sample showed outstanding hydrogen storage performance especially in the aspect of hydrogen absorption. The as-prepared sample started to take up hydrogen at nearly room temperature and eventually absorbed 6.8 wt% hydrogen at 200 °C. The apparent activation energy (Ea) of hydrogen absorption for the sample was decreased to 26.7 kJ/mol, much lower than that of other reported systems. For the dehydrogenation experiments, the hydrogenated sample could start to release hydrogen at about 275 °C and 6.5 wt% hydrogen was desorbed in 20 min at 325 °C. Interestingly, the prepared samples showed noteworthy air stability. Been placed in the air for 60 min, the dehydrogenation kinetics and hydrogen capacityof thethree samples were basically unchanged, making it possible to be used in future commercial applications.