Correlation between Structure of Titanium Additives and Dehydrogenation Reaction of Magnesium Borohydride Studied by Continuous Observation of X-Ray Absorption Spectroscopy

Daiju Matsumura; Takahiro Ohyama; Yuka Okajima; Yasuo Nishihata; Hai-Wen Li; Shin-ichi Orimo

doi:10.2320/matertrans.MA201018

Daiju Matsumura, Takahiro Ohyama, Yuka Okajima, Yasuo Nishihata, Hai-Wen Li, Shin-ichi Orimo

Author information

Keywords: magnesium borohydride, X-ray absorption fine structure, dehydrogenation reaction, hydrogen, hydride

JOURNAL FREE ACCESS

2011 Volume 52 Issue 4 Pages 635-640

DOI https://doi.org/10.2320/matertrans.MA201018

View "Advance Publication" version (January 26, 2011).

Details

Abstract

Local structure of Ti-based additives in Mg(BH₄)₂ was studied by X-ray absorption fine structure spectroscopy with conventional and dispersive mode in order to understand the correlation between the structure of the additives and dehydrogenation property of Mg(BH₄)₂. Simultaneous measurement of the dehydrogenation curve and the X-ray absorption spectroscopy by the dispersive optics revealed that a part of TiCl₃ additive is converted to Ti_xMg_1−3x⁄2(BH₄)₂ (x=0∼0.67) just after ball milling mixture and then promptly resolved to TiB₂ at 100–150°C with the first dehydrogenation peak. TiO₂ additive is slowly converted to lower oxidation state in wide temperature range around the second dehydrogenation peak at 350°C where the main dehydrogenation reaction of Mg(BH₄)₂ occurs.

Corresponding author

Register with J-STAGE for free!