Evaluations of Hydrogen Properties of MgHx-Nb₂O5 Oxide Composite by Hydrogen Induced Mechanical Alloying

• Published in: 한국수소및신에너지학회논문집 Vol. 23; no. 5; pp. 429 - 436
• Main Authors: 이나리(Na Ri Lee), 이수선(Soo Sun Lee), 홍태환(Tae Whan Hong)
• Format: Journal Article
• Language: English
• Published: 한국수소및신에너지학회 01.10.2012
• Subjects: 기계공학; 수소화물; 수소저장합금; 반응속도; Hydrogen storage alloy; 기계적 합금화법; Hydride; Kinetics; Mechanical alloying
• ISSN: 1738-7264; 2288-7407
• DOI: 10.7316/KHNES.2012.23.5.429

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 Nb2O5 on the kinetics of the Magnesium hydrogen absorption kinetics was investigated. MgHx-5wt.% Nb2O5 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 MgHx-5wt.% Nb2O5 (type I and II) are determined at 423, 473, 523, 573 and 623 K. KCI Citation Count: 0