Improved hydrogen storage of LiBH4 catalyzed magnesium
Improved hydrogen storage of LiBH4 catalyzed magnesium
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DOI：
10.1021/jp072803f
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发表时间：
2007-08
影响因子：
3.7
通讯作者：
Jianfeng Mao;Zhu Wu;T. Chen;Baicheng Weng;N. Xu;T. Huang;Zaiping Guo;Huakun Liu;D. Grant;G. Walker;Xuebin Yu
中科院分区：
文献类型：
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作者：
Jianfeng Mao;Zhu Wu;T. Chen;Baicheng Weng;N. Xu;T. Huang;Zaiping Guo;Huakun Liu;D. Grant;G. Walker;Xuebin Yu
研究了LiBH 4对镁吸氢性能的影响。结果发现，LiBH 4/Mg混合物的储氢性能表现出显着的改善相比，普通镁粉。例如，在250 °C下，LiBH 4/Mg（质量比1：4）复合材料可以在60 min内吸收6.7 wt %的氢，而在类似条件下，纯镁在相同时间内仅吸收不到1 wt %的氢。与纯镁粉相比，复合材料在350 °C下的放氢性能也得到了显著改善。在此基础上，采用高氢压球磨LiBH 4/Mg混合物的方法直接合成了高活性的氢化镁。合成的氢化镁表现出上级的动力学，在200 °C的相对低的温度下在100分钟内吸收5.78重量%的氢。
The effect of LiBH4 on the hydrogen sorption performance of magnesium was investigated. It was found that the hydrogen storage properties of LiBH4/Mg mixtures exhibit a dramatic improvement as compared to plain magnesium powder. For example, at 250 °C, a LiBH4/Mg (mass ratio 1:4) composite can absorb 6.7 wt % hydrogen in 60 min, while only less than 1 wt % hydrogen was absorbed by pure magnesium in the same period under similar conditions. The hydrogen desorption properties of the composite at 350 °C were also improved significantly as compared to the plain magnesium powder. Furthermore, highly activated magnesium hydride was synthesized directly by ball milling LiBH4/Mg mixtures under high hydrogen pressure. The synthesized magnesium hydride exhibits superior kinetics, absorbing 5.78 wt % hydrogen at the relatively low temperature of 200 °C within 100 min.