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Enhanced hydrogen storage kinetics of an Mg-Pr-Al composite by in situ formed Pr3Al11 nanoparticles
Caiqin Zhou1, Can Li, Yongtao Li
1School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China. qazhang_ahut@163.com.
Abstract:
Slow hydrogen sorption kinetics is one of the challenges facing practical applications of MgH2. To improve the hydrogen sorption kinetics, an Mg-Pr-Al composite is prepared by ball milling of a 14MgH2 + Pr + Al powder mixture. During hydrogenation and dehydrogenation processes of the Mg-Pr-Al composite, two reversible side reactions, i.e. 2PrH2 + H2 = 2PrH3 and Mg17Al12 + 17H2 = 17MgH2 + 12Al, occur accompanying hydrogen adsorption and desorption of the Mg-H2 system. The in situ formed Pr3Al11 phase in the activated Mg-Pr-Al composite is stable during further hydrogen adsorption and desorption processes, which plays a role in inhibiting growth of Mg crystallites. Hence, the improvement of hydrogen sorption kinetics for the Mg-Pr-Al composite is ascribed to the inhibiting role of Pr3Al11 in crystallite growth as well as the catalytic effect of PrH3/PrH2 on hydrogen sorption. These findings provide an important guidance for developing new Mg-based materials with superior hydrogen storage properties.
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