Improved hydrogen storage properties of LiBH4 confined with activated charcoal by ball milling
Improved hydrogen storage properties of LiBH4 confined with activated charcoal by ball milling
复制标题
球磨活性炭约束 LiBH4 提高储氢性能
DOI：
10.1007/s12598-018-1067-1
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发表时间：
2019-04-01
期刊：
影响因子：
8.8
通讯作者：
Yan, Mi
中科院分区：
文献类型：
--
作者：
Zhou, He;Wang, Xin-Hua;Yan, Mi
为了提高LiBH 4的储氢性能，本文采用活性炭作为骨架材料对LiBH 4进行包覆。采用球磨法制备了LiBH 4/AC复合材料。结果表明，球磨LiBH 4/AC（LiBH 4/AC-BM）的放氢性能较纯LiBH 4、球磨LiBH 4（LiBH 4-BM）和手工球磨LiBH 4/AC（LiBH 4/AC-HM）有很大提高。LiBH 4/AC-BM的LiBH 4开始脱氢温度约为160 ℃，比原始LiBH 4低170 ℃。在400 ℃左右，LiBH 4/AC-BM完成了脱氢，氢容量为13.6wt%，这与纯LiBH 4的理论脱氢容量（13.8wt%）接近，而LiBH 4-BM和LiBH 4/AC-BM即使加热到600 ℃也没有完成脱氢过程。在350 ℃下，LiBH 4/AC-BM的放氢量仅为10.1wt%，而LiBH 4和LiBH 4/AC-HM的放氢量均小于1wt%。讨论了催化剂活性炭的作用及脱氢过程。
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.