Hydrogen storage performance of LiBH 4+1/2MgH 2 composites improved by Ce-based additives
Hydrogen storage performance of LiBH 4+1/2MgH 2 composites improved by Ce-based additives
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DOI：
10.1016/j.ijhydene.2011.02.006
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发表时间：
2011-05
期刊：
影响因子：
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通讯作者：
Bin Liu;B. Zhang;Y. Jiang
中科院分区：
文献类型：
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作者：
Bin Liu;B. Zhang;Y. Jiang
LiBH_4 +1/2 MgH_2是一种很有前途的反应型储氢复合材料。采用三种Ce基添加剂作为催化剂，对LiBH 4 +1/2 MgH 2复合材料的储氢性能进行了研究。与纯复合材料相比，添加Ce的复合材料表现出显着改善的脱氢动力学和循环稳定性。X射线衍射和扫描电子显微镜分析清楚地揭示了相转变和形态演变过程中的双脱氢循环。与铈基添加剂的复合材料显示稳定的纳米结构，在未催化的复合材料中的快速微观结构恶化。5次循环后，复合材料中形成的CeB 6颗粒尺寸约为10 nm。它可以作为核心MgB 2形成在脱氢过程中，从而占循环后的复合材料的结构和性能稳定性。
LiBH4+1/2MgH2is a promising reactive hydride composite for hydrogen storage. In the present study, three Ce-based additives were used as catalysts to enhance the hydrogen storage performance of LiBH4+1/2MgH2composites. The composites with Ce additives demonstrated significantly improved dehydrogenation kinetics and cyclic stability compared with the pure composite. X-ray diffraction and scanning electron microscopy analyses clearly revealed the phase transitions and morphological evolution during the hydriding-dehydriding cycling. The composites with Ce-based additives displayed stable nanostructures, in contrast to the rapid microstructural deterioration in the uncatalyzed composite. The CeB6formed in the composites had a particle size of 10 nm after five cycles. It may act as the nucleus for MgB2formation during dehydrogenation and thus account for the structural and performance stability of the composites upon cycling.