Hydrogen storage in 2NaBH4 + MgH2 mixtures: Destabilization by additives and nanoconfinement
Hydrogen storage in 2NaBH4 + MgH2 mixtures: Destabilization by additives and nanoconfinement
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DOI：
10.1016/j.jallcom.2011.12.042
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发表时间：
2012-09
影响因子：
6.2
通讯作者：
G. Mulas;R. Campesi;S. Garroni;E. Napolitano;C. Milanese;F. Dolci;E. Pellicer;M. D. Baró;A. Marini
中科院分区：
文献类型：
--
作者：
G. Mulas;R. Campesi;S. Garroni;E. Napolitano;C. Milanese;F. Dolci;E. Pellicer;M. D. Baró;A. Marini
研究了不同方法稳定的2NaBH4+ mgh2体系的脱氢性能。采用球磨法制备了初始氢化物的纳米结构粉末混合物，并通过将初始氢化物熔浸到si基SBA-15载体中得到了纳米限制性反应复合材料。在两种制备中对nbf5作为催化剂进行了测试。通过X射线衍射和透射电镜对SBA15基质进行了结构表征，评价了SBA15基质的成功合成、球磨氢化物和纳米氢化物的微观结构特征以及渗透过程的成功。通过压力sievert型仪器和热脱附光谱对吸附性能的评价，揭示了不同途径获得的氢化物失稳在降低氢释放温度和改善脱附动力学方面的效率。
We focus on the H2desorption properties of the 2NaBH4+MgH2system destabilized by different methods. Nanostructured powder mixtures were prepared by ball milling the starting hydrides and nanoconfined reactive composites were obtained by melting infiltration of the hydrides into a Si-based SBA-15 support. NbF5was tested as catalyst in both the preparations. Structural characterization by X Ray Diffraction and Transmission Electron Microscopy allowed evaluating the successful synthesis of SBA15 matrix, the microstructural features of ball milled and nanoconfined hydrides as well as the success of infiltration process. The evaluation of the sorption properties, by manometric Sievert-type apparatus and thermal desorption spectroscopy, revealed the efficiency of the hydride destabilization, obtained by the different routes, in decreasing the hydrogen release temperature and improving desorption kinetics.