Study on reaction mechanism of dehydrogenation of magnesium hydride by in situ transmission electron microscopy

Isobe, Shigehito; Ono, Akifumi; Yao, Hao; Wang, Yongming; Hashimoto, Naoyuki; Ohnuki, Somei
May 2010
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p223109
Academic Journal
In situ observation on dehydrogenation of MgH2 was performed by using transmission electron microscope (TEM). The dehydrogenation of MgH2 with 1 mol % Nb2O5 and formation of nanosized Mg particles were observed at 150 °C. Nb2O5 was not confirmed in diffraction patterns and TEM images probably due to wide dispersion. On MgH2 with 10 mol % Nb2O5, the high resolution TEM could recognize the dehydrogenation at the interface between MgH2 and Nb2O5, proceeding with increasing temperature. This suggests that hydrogen atoms could diffuse from MgH2 phase to the interface between Mg and Nb2O5, resulting in formation of hydrogen molecules at the interface.


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