Study of the decomposition of a 0.62LiBH4-0.38NaBH4 mixture

被引：27
作者：
Liu, Yinzhe [1 ]
Reed, Daniel [1 ]
Paterakis, Christos [1 ]
Vasquez, Luis Contreras [1 ]
Baricco, Marcell [2 ,3 ]
Book, David [1 ]
机构：
[1] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England
[2] Univ Turin, Dept Chem, Via P Giuria 9, I-10125 Turin, Italy
[3] Univ Turin, NIS, Via P Giuria 9, I-10125 Turin, Italy
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2017年 / 42卷 / 35期
基金：
英国工程与自然科学研究理事会;
关键词：
Hydrogen storage; Eutectic borohydrides; Dehydrogenation; Decomposition; Powder X-ray diffraction; Raman spectroscopy; ENHANCED HYDROGEN DESORPTION; METAL BOROHYDRIDES; STORAGE PROPERTIES; LIBH4-CA(BH4)(2); REVERSIBILITY; LIBH4-MG(BH4)(2); NANOCONFINEMENT; STABILITY; PROGRESS;
D O I：
10.1016/j.ijhydene.2017.03.141
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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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页码：22480 / 22488
页数：9
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