Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5145481 | International Journal of Hydrogen Energy | 2017 | 9 Pages |
Abstract
This work highlights the dehydrogenation mechanisms of a 0.62LiBH4-0.38NaBH4 mixture in the range of 25-650 °C in flowing Ar. The dehydrogenation starts from 287 °C followed by two decomposition steps at 488 °C and 540 °C. These peak temperatures are in the range of 470 °C (for pure LiBH4)-580 °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 °C; whilst the 2nd step of dehydrogenation is mainly accompanied by the precipitation of Na and B when temperature is higher than 520 °C. The total amount of H2 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.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Yinzhe Liu, Daniel Reed, Christos Paterakis, Luis Contreras Vasquez, Marcello Baricco, David Book,