Materials Transactions Online

Materials Transactions, Vol.49 No.10 (2008) pp.2224-2228
© 2008 The Japan Institute of Metals

Synthesis and Hydrogen Storage Properties of a Single-Phase Magnesium Borohydride Mg(BH4)2

Hai-Wen Li1, Kentaro Kikuchi2, Toyoto Sato1, Yuko Nakamori1, Nobuko Ohba3, Masakazu Aoki3, Kazutoshi Miwa3, Shin-ichi Towata3 and Shin-ichi Orimo1

1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2Graduate School of Enviromental Studies, Tohoku University, Sendai 980-8579, Japan
3Toyota Central R&D Labs., Inc., Nagakute, Aichi 480-1192, Japan

A single phase Mg(BH4)2 was successfully synthesized and its hydrogen storage properties were systematically investigated. Depending on the synthesis conditions, Mg(BH4)2 forms low- and high-temperature phases with different crystal structures. The dehydriding reaction of Mg(BH4)2 starts at approximately 500 K, and 14.4 mass% of hydrogen is released through a multi-step reaction. Furthermore, 6.1 mass% of hydrogen can be rehydrided for the sample of Mg(BH4)2 after the dehydriding reaction, through the formation of a possible intermediate compound such as MgB12H12.

(Received 2008/4/1; Accepted 2008/6/17; Published 2008/7/30)

Keywords: borohydride, synthesis, dehydriding, hydrogen storage, complex hydride

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