Correlation between structure of titanium additives and dehydrogenation reaction of magnesium borohydride studied by continuous observation of X-ray absorption spectroscopy

Matsumura, Daiju ; Oyama, Takahiro*; Okajima, Yuka*; Nishihata, Yasuo; Li, H.-W.*; Orimo, Shinichi*

Local structure of Ti-based additives in Mg(BH $_{4}$ ) $_{2}$ 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(BH $_{4}$ ) $_{2}$ . Simultaneous measurement of the dehydrogenation curve and the X-ray absorption spectroscopy by the dispersive optics revealed that a part of TiCl $_{3}$ additive is converted to Ti $_{x}$ Mg $_{1-3x/2}$ (BH $_{4}$ ) $_{2}$ ( = 00.67) just after ball milling mixture and then promptly resolved to TiB $_{2}$ at 100-150 $^{circ}$ C with the first dehydrogenation peak. TiO $_{2}$ additive is slowly converted to lower oxidation state in wide temperature range around the second dehydrogenation peak at 350 $^{circ}$ C where the main dehydrogenation reaction of Mg(BH $_{4}$ ) $_{2}$ occurs.

Language	:	English
Journal	:	Materials Transactions
Volume	:	52
Number	:	4
Pages	:	p.635 - 640
Publication Year/Month	:	2011/04
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Paper URL	:	https://doi.org/10.2320/matertrans.MA201018
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
Press Release	:
Article of JAEA R&D Review	:	Mechanism of Performance Improvement of Hydrogen Storage Materials; Structural Determination of Additives by X-ray Absorption Spectroscopy[/]
Cooperating Institute	:	東北大学

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InCites™	:	Percentile:54.56 Category:Materials Science, Multidisciplinary
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Registration No. : AA20100871
JAEA Abstracts No. : 39000845
Paper Submission No. : 9093

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