Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Evaluation of Hydrogen Properties on Mg2NiHx-Graphene Composites by Mechanical Alloying

기계적 합금화법으로 제조한 Mg2NiHx-Graphene 복합재료의 수소화 특성 평가

  • 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)
  • 이영상 (한국교통대학교 신소재공학과/친환경에너지 부품 소재센터) ;
  • 이수선 (한국교통대학교 친환경에너지 부품소재센터) ;
  • 이병하 (명지대학교 신소재공학과) ;
  • 정석 (명지대학교 신소재공학과) ;
  • 홍태환 (한국교통대학교 신소재공학과/친환경에너지 부품 소재센터)
  • Received : 2013.12.17
  • Accepted : 2014.02.28
  • Published : 2014.02.28
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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.

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References

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