Improvement of Hydrogenation and Dehydrogenation Kinetics on MgH2 by the Catalytic Effect of ZrO2

Liang Zeng; Toru Kimura; Satoshi Hino; Hiroki Miyaoka; Takayuki Ichikawa; Yoshitsugu Kojima

doi:10.4028/www.scientific.net/AMM.117-119.1195

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 117-119Improvement of Hydrogenation and Dehydrogenation...

Improvement of Hydrogenation and Dehydrogenation Kinetics on MgH₂ by the Catalytic Effect of ZrO₂

Abstract:

Hydrogen desorption temperature of MgH₂, which was milled with 20 pieces of ZrO₂ balls for 20 h, was decreased to 240 °C, although steel−ball−milled MgH₂ required more than 350 °C. Moreover, the completely dehydrogenated product was able to absorb hydrogen of ~3.5 mass% even at room temperature under 1 MPa hydrogen within 5 hours. Inductively coupled plasma−atomic emission spectroscopy analysis revealed zirconium element was doped into MgH₂ from the ZrO₂ balls during the milling process. Therefore, it was concluded that the presence of ZrO₂ improved the kinetics of the hydrogenation and dehydrogenation behaviors of MgH₂.