Enhanced hydrogen storage properties of the 2LiBH4-MgH2composite with BaTiO3as an additive
Enhanced hydrogen storage properties of the 2LiBH4-MgH2composite with BaTiO3as an additive
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BaTiO3 作为添加剂增强 2LiBH4-MgH2 复合材料的储氢性能
DOI：
10.1039/c6dt00045b
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发表时间：
2016
影响因子：
4
通讯作者：
Ma Mingzhen
中科院分区：
文献类型：
--
作者：
Wang Jiasheng;Han Shumin;Wang Zhibin;Ke D;an;Liu Jingjing;Ma Mingzhen
通过球磨LiBH4、MgH2和BaTiO3制备了2LiBH4-MgH2+20 wt% BaTiO3复合材料，并研究了BaTiO3对复合材料储氢性能的影响。 TG-DSC结果表明，复合材料的起始脱氢温度为299 ℃，比2LiBH4-MgH2降低了124 ℃，且在500 ℃时复合材料的脱氢量从6.86 wt%增加到7.48 wt%。动力学测试表明，2LiBH4–MgH2 + 20 wt% BaTiO3 的脱氢量在 400 秒内达到 1.5 wt%，几乎是 2LiBH4–MgH2 的 10 倍。 BaTiO3 在复合材料脱氢过程中与 LiBH4 反应，生成 BaB6 和 TiO2。 BaB6有利于降低LiBH4的稳定性，而TiO2对改善Mg与LiBH4之间的加氢/脱氢动力学具有催化作用。
The 2LiBH4–MgH2 + 20 wt% BaTiO3 composite was prepared by ball-milling LiBH4, MgH2 and BaTiO3, and the effect of BaTiO3 on the hydrogen storage properties of the composite was investigated. TG-DSC results show that the onset dehydrogenation temperature of the composite is 299 °C, which is 124 °C lower than that of 2LiBH4–MgH2, and the dehydrogenation amount of the composite increases from 6.86 wt% to 7.48 wt% at 500 °C. Kinetic tests show that the dehydrogenation amount of 2LiBH4–MgH2 + 20 wt% BaTiO3 reaches 1.5 wt% within 400 seconds, almost 10 times that of 2LiBH4–MgH2. BaTiO3 reacts with LiBH4 during the dehydrogenation of the composite and generates BaB6 and TiO2. BaB6 is beneficial to lower the stability of LiBH4, while TiO2 has a catalytic effect in improving the hydrogenation/dehydrogenation kinetics of the reaction between Mg and LiBH4.