期刊
RARE METALS
卷 38, 期 4, 页码 321-326出版社
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-018-1067-1
关键词
Hydrogen storage properties; Hydrogen storage materials; Lithium borohydride; Activated charcoal
资金
- National Natural Science Foundation of China [51471149, 51171168]
- Public Project of Zhejiang Province [2015C31029]
In order to enhance the hydrogen storage properties of LiBH4, activated charcoal (AC) was used as the scaffold to confine LiBH4 in this paper. Ball milling was used to prepare LiBH4/AC composites. Experimental results show that dehydrogenation properties of ball-milled LiBH4/AC (LiBH4/AC-BM) are greatly improved compared with that of pristine LiBH4, ball-milled LiBH4 (LiBH4-BM) and hand-milled LiBH4/AC (LiBH4/AC-HM). The onset dehydrogenation temperature of LiBH4 for LiBH4/AC-BM is around 160 degrees C, which is 170 degrees C lower than that of pristine LiBH4. At around 400 degrees C, LiBH4/AC-BM finishes the dehydrogenation with a hydrogen capacity of 13.6wt%, which is approximately the theoretical dehydrogenation capacity of pure LiBH4 (13.8wt%), while the dehydrogenation processes for LiBH4-BM and LiBH4/AC-BM do not finish even when they were heated to 600 degrees C. The isothermal dehydriding measurements show that it takes only 15min for LiBH4/AC-BM to reach a dehydrogenation capacity of 10.1wt% at 350 degrees C, whereas the pristine LiBH4 and the LiBH4/AC-HM release hydrogen less than 1wt% under the same conditions. The dehydrogenation process and the effect of AC were discussed.
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