Thermal decomposition of alkaline-earth metal hydride and ammonia borane composites |
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Authors: | Yu Zhang Keiji ShimodaHiroki Miyaoka Takayuki IchikawaYoshitsugu Kojima |
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Affiliation: | Institute for Advanced Materials Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan |
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Abstract: | We demonstrate a method to improve the promising hydrogen storage capabilities of ammonia borane by making composites with alkaline-earth metal hydrides using ball-milling technique. The ball-milling for the mixtures of alkaline-earth metal hydride (MgH2 or CaH2) and ammonia borane (AB) yields a destabilization compared with the ingredient of the mixture, showing the hydrogen capacity of 8.7 and 5.8 mass% at easily accessible dehydrogenation peak temperatures of 78 and 72 °C, respectively, without the unwanted by-product borazine. Through detailed analyses on the dehydrogenation performance of the composite at various ratios in the hydride and AB, we proposed a different chemical activation mechanism from that in the LiH/AB and NaH/AB systems reported in a previous literature. |
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Keywords: | Hydrogen Ammonia borane Alkaline-earth metal hydride Dehydrogenation Borazine |
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