Microstructure and Hydrogen Storage Properties of Nanostructured Mg-Al Alloy from Reactive Milling with Carbon as Milling Aid
ZHANG Tong-huan1, ZHOU Shi-xue1, NIU Hai-li1, XIAO Cheng-zhu2, WANG Nai-fei1
1. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China;
2. Rizhao Steel Holding Group Co., LTD., Rizhao 276806, Shandong, China
Abstract：Nanostructured Mg-Al alloy hydrogen storage material was prepared with modified anthracite as milling aid by ball milling under hydrogen atmosphere. The crystal phase structure and dehydrogenation kinetics properties of the ball milled hydrogen absorbing materials and static re-hydrogenated materials were analyzed by SEM, XRD and TPD. The results show that the modified anthracite plays a good milling aid role, after 5.5 h of milling, the average particle size of Mg-Al alloy reaches to 74 nm; The Mg in the Mg-Al alloy transforms into β-MgH2 and γ-MgH2 after reaction ball milling, whose peak dehydrogenation temperature is lower than 300 ℃. Yet, after static re-hydrogenation, the MgH2 all exists in β-MgH2 which shows a 60% increase in crystal size, and the Mg17Al12 decomposes into elementary Mg and Al. The elementary Al decreases the dehydrogenation activation energy of hydrogen storage materials, where the hydrogen level of apparent activation energy of the ball milled hydrogen storage material and re-hydrogenated material is 107.3kJ/mol and 67.1kJ/mol, respectively, calculated according to the Kissinger equation.
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2015, Vol. 43 
