Effect of carbon nanotubes on the microstructural evolution and hydrogen storage properties of Mg(BH4)(2)
Effect of carbon nanotubes on the microstructural evolution and hydrogen storage properties of Mg(BH4)(2)
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碳纳米管对Mg(BH4)(2)微观结构演变和储氢性能的影响
DOI：
10.1016/j.jallcom.2018.01.346
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发表时间：
2018
影响因子：
6.2
通讯作者：
Wu Ying
中科院分区：
文献类型：
--
作者：
Jiang Zan;Yuan Jianguang;Han Huanqing;Wu Ying
Mg(BH_4)_2是络合氢化物中的重要成员，具有很高的重量容量(14.9wt% )。本研究采用离子交换法合成了镁(BH4)2。然后，用机械球磨法制备了不同碳纳米管含量(2、5、10、25和50 wt%)的Mg(BH4)2复合材料。研究了碳纳米管对材料微观结构演变和储氢性能的影响。Mg(BH4)2-5 wt%碳纳米管的起始脱附温度从2 75 °C降至12 0 °C左右，脱附平台最高，这归因于碳纳米管引起了反应路径的改变。此外，Mg(BH4)2-5 wt%碳纳米管具有最好的脱氢动力学性能，在300 °C下，可以在2000 S范围内脱附6.04 wt%氢，脱氢活化能降至130.2 kJ/ H2，远低于纯Mg(BH4)2。
As an important member of complex hydrides, Mg(BH4)2has a high gravimetric capacity (14.9 wt%). In this study, the Mg(BH4)2was synthesized by the ion exchange method. Afterwards, the Mg(BH4)2composites with different amounts (2, 5, 10, 25 and 50 wt%) of carbon nanotubes (CNTs) were prepared by mechanical milling. Effects of the CNTs on the microstructural evolution and hydrogen storage properties were investigated. The onset desorption temperature of the Mg(BH4)2-5 wt% CNTs is decreased to lower temperature around 120 °C from 275 °C. The desorption plateau of Mg(BH4)2-5 wt% CNTs is the highest, which ascribes that CNTs causes the reaction pathway change. Additionally, the Mg(BH4)2-5 wt% CNTs shows the best dehydriding kinetics properties, and can desorb 6.04 wt% hydrogen within 2000 s at 300 °C. The dehydrogenation activation energy of the Mg(BH4)2-5 wt% CNTs is decreased to 130.2 kJ/mol H2, which is much lower than that of pure Mg(BH4)2.