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http://dx.doi.org/10.7316/KHNES.2014.25.1.019

Evaluation of Hydrogen Properties on Mg2NiHx-Graphene Composites by Mechanical Alloying  

Lee, Young-Sang (Department of Materials Science and Engineering/Research Center for Sustainable Eco-Devices and Materials(RIC-ReSEM), Korea National University of Transportation)
Lee, Soo-Sun (Research Center for sustainable Eco-Devices and materials(RIC-ReSEM))
Lee, Byung-Ha (Department of Material Science & Engineering, Myongji University)
Jung, Seok (Department of Material Science & Engineering, Myongji University)
Hong, Tae-Whan (Department of Materials Science and Engineering/Research Center for Sustainable Eco-Devices and Materials(RIC-ReSEM), Korea National University of Transportation)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.25, no.1, 2014 , pp. 19-27 More about this Journal
Abstract
Mg hydride has a high hydrogen capacity (7.6%), at high temperature, and is a lightweight and low cost material, thus it a promising hydrogen storage material. However, its high operation temperature and very slow reaction kinetics are obstacles to practical application. In order to overcome these disadvantages of Mg hydride, graphene powder was added to it. The addition of graphene has been shown to reduce the operating temperature of dehydrogenation. Moreover, in this report the environmental aspects of $MgH_x$-Graphene composites are investigated by means of the environmental life cycle assessment (LCA) method. $MgH_x$-Graphene mixture was prepared by hydrogen induced mechanical alloy (HIMA). The synthesized powder was characterized by XRD(X-ray Diffraction). The hydrogenation behaviors were evaluated by using a Sievert's type automatic PCT apparatus. Such evaluation of Materials also conducted in the LCA. From the result of P-C-T(Pressure-Composition-Temperature) curves, the $MgH_x$-3wt.% graphene composite was evaluated as having a 5.86wt.% maximum hydrogen storage capacity, at 523K. From absorption kinetic testing, the $MgH_x$-7wt.% graphene composite was evaluated as having a maximum 6.94wt.%/ms hydrogen absorption rate, at 573K. Environment evaluation results for the $MgH_x$-graphene composites and other materials indicated environmental impact from the electric power used and from the materials themselves.
Keywords
Hydrogen storage materials; Hydrogenation properties; Reactive mechanical alloying; $Mg_2NiH_x$-graphene; Life Cycle Assessment;
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