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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Evaluations of Hydrogen Properties of MgHx-Nb2O5 Oxide Composite by Hydrogen Induced Mechanical Alloying

수소 가압형 기계적 합금화법으로 제조한 MgHx-Nb2O5 산화물 복합 재료의 수소화 특성 평가

  • Lee, Nari (Korea National University of Transportation) ;
  • Lee, Soosun (Korea National University of Transportation) ;
  • Hong, Taewhan (Korea National University of Transportation)
  • 이나리 (한국교통대학교 신소재공학과) ;
  • 이수선 (한국교통대학교 신소재공학과) ;
  • 홍태환 (한국교통대학교 신소재공학과)
  • Received : 2012.07.31
  • Accepted : 2012.10.26
  • Published : 2012.10.31
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Abstract

Mg and Mg-based alloys are regarded as strong candidate hydrogen storage materials since their hydrogen capacity exceeds that of known metal hydrides. One of the approaches to improve kinetic is addition of metal oxide. In this paper, we tried to improve the hydrogenation properties of Mg-based hydrogen storage composites. The effect of transition metal oxides, such as $Nb_2O_5$ on the kinetics of the Magnesium hydrogen absorption kinetics was investigated. $MgH_x$-5wt.% $Nb_2O_5$ composites have been synthesized by hydrogen induced mechanical alloying. The powder fabricated was characterized by X-ray diffraction (XRD), Field Emission-Scanning Electron Microscopy (Fe-SEM), Energy Dispersive X-ray (EDX), BET and simultaneous Thermo Gravimetric Analysis / Differential Scanning Calorimetry (TG/DSC) analysis. The Absorption / desorption kinetics of $MgH_x$-5wt.% $Nb_2O_5$ (type I and II) are determined at 423, 473, 523, 573 and 623 K.

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References

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