期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 42, 期 35, 页码 22480-22488出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2017.03.141
关键词
Hydrogen storage; Eutectic borohydrides; Dehydrogenation; Decomposition; Powder X-ray diffraction; Raman spectroscopy
资金
- People Programme - Marie Curie Actions of the European Union Seventh Framework Programme [607040]
- EPSRC [EP/K026216/1, EP/L017725/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L017725/1, EP/K026216/1] Funding Source: researchfish
This work highlights the dehydrogenation mechanisms of a 0.62LiBH(4)-0.38NaBH(4) mixture in the range of 25-650 degrees C in flowing Ar. The dehydrogenation starts from 287 degrees C followed by two decomposition steps at 488 degrees C and 540 degrees C. These peak temperatures are in the range of 470 degrees C (for pure LiBH4)-580 degrees C (for pure NaBH4) due to different Pauling electronegativity values for Li+ (0.98) and Na+ (0.93) that affects the stability and decomposition temperatures. The 1St step of dehydrogenation is accompanied with precipitation of LiH, Li2B12H12 and B in between 287 and 520 degrees C; whilst the 2nd step of dehydrogenation is mainly accompanied by the precipitation of Na and B when temperature is higher than 520 degrees C. The total amount of H-2 released is 10.8 wt.% that exceeds the estimated amount (8.9 wt.%), indicating less metal dodecaborate (than that for pure LiBH4) is formed during the decomposition. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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