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http://dx.doi.org/10.7316/khnes.2011.22.6.780

Evaluation of Hydrogenation Behavior of MgHx-Graphene Composites by Mechanical Alloying  

Lee, Soo-Sun (Department of Materials Science and Engineering/Research Center for Sustainable ECo-Devices and Materials (ReSEM), Chungju National University)
Lee, Na-Ri (Department of Materials Science and Engineering/Research Center for Sustainable ECo-Devices and Materials (ReSEM), Chungju National University)
Kim, Kyeong-Il (Department of Materials Science and Engineering/Research Center for Sustainable ECo-Devices and Materials (ReSEM), Chungju National University)
Hong, Tae-Whan (Department of Materials Science and Engineering/Research Center for Sustainable ECo-Devices and Materials (ReSEM), Chungju National University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.22, no.6, 2011 , pp. 780-786 More about this Journal
Abstract
Mg hydride had high hydrogen capacity (7.6%), lightweight and low cost materials and it was promising hydrogen storage material at high temperature. However, commercial applications of the Mg hydride are currently hindered by its high absorption/desorption temperature, and very slow reaction kinetics. one of the approaches to improve the kinetic is $MgH_x$ intermixed with carbon. And it shows that carbon and carbon allotropes have a beneficial effect on hydrogen sorption in Mg. The graphene is a kind of carbon allotropes which is easily desorbed reaction at low temperatures because its reaction is exothermic. In this work, the effect of graphene concentration on the kinetics of Mg hydrogen absorption reaction was investigated. The $MgH_x$-Graphene composites has been prepared by hydrogen induced mechanical alloy (HIMA). The synthesized powder was characterized by XRD and simultaneous TG, DSC analysis. The hydrogenation behaviors were evaluated by using a sievert's type automatic PCT apparatus. In this research, results of kinetic profiles exhibit hydrogen absorption rate of $MgH_x$-5wt.% and 10wt.% graphene composite, as 1.25wt.%/ms, 10.33wt.%/ms against 0.88wt.%/ms for $MgH_x$ alone at 473K.
Keywords
Hydrogen storage material; Mg hydrides; $MgH_x$-graphene composite; Hydrogen induced mechanical alloying; Kinetics;
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Times Cited By KSCI : 3  (Citation Analysis)
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