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AB–MH (Ammonia Borane–Metal Hydride) composites : systematic understanding of dehydrogenation properties

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Title: AB–MH (Ammonia Borane–Metal Hydride) composites : systematic understanding of dehydrogenation properties
Authors: Nakagawa, Yuki Browse this author
Isobe, Shigehito Browse this author →KAKEN DB
Ikarashi, Yudai Browse this author
Ohnuki, Somei Browse this author
Issue Date: 2014
Publisher: Royal Society of Chemistry
Journal Title: Journal of Materials Chemistry A
Volume: 2
Issue: 11
Start Page: 3926
Publisher DOI: 10.1039/c3ta14670g
Description: Dehydrogenation properties of AB–MH (Ammonia Borane–Metal Hydride, M = K, Na, Li, Ca, Mg, Al) composites were systematically investigated by thermal and mass analyses. The results suggest that the Pauling electronegativity of M, χp, is a good indicator to predict the phases of composites, the dehydrogenation temperature and the amount of by-product gases (NH3 and B2H6). The phases of composites were classified by χp as follows. MBH4 was formed for M = K, Na (χp ≤ 0.9), MNH2BH3 was formed for M = Na, Li (0.9 ≤ χp ≤ 1.0) and no new compounds were formed for M = Ca, Mg, Al (1.0 ≤ χp). The 1st dehydrogenation temperatures of the samples (M = Na, Li, Ca, Mg) were 10–20 °C lower than that of AB itself (χp ≤ 1.2). The amount of NH3 was decreased as χp increased. On the other hand, the amount of B2H6 was decreased as χp decreased. The emission of B3H6N3 could occur by the reaction of NH3 and B2H6. Finally, AB–MAlH4 (M = Na, Li) composites, which were prepared based on the indicator, showed superior potential as hydrogen storage materials because they did not desorb any by-products NH3, B2H6 and B3H6N3.
Type: article
Appears in Collections:創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 礒部 繁人

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