Composite materials of melt-spun Mg90Ni10 and graphite: Microstructural changes during cyclic hydrogenation and the impact on gas and heat transport characteristics
Composite materials of melt-spun Mg90Ni10 and graphite: Microstructural changes during cyclic hydrogenation and the impact on gas and heat transport characteristics
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DOI：
10.1016/j.ijhydene.2014.03.163
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发表时间：
2014-05
影响因子：
7.2
通讯作者：
C. Pohlmann;B. Kieback;L. Röntzsch
中科院分区：
文献类型：
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作者：
C. Pohlmann;B. Kieback;L. Röntzsch
氢化物基储氢罐的装卸动力学研究具有重要的技术意义，其主要受反应床内传热和气体传递特性的影响。在这方面，与常用的粉末床相比，氢化物-石墨复合材料提供了更好的传热性能和更高的体积存储容量。在这篇文章中，我们报道了基于熔融纺制Mg90Ni10的致密氢化物-石墨复合材料的循环稳定性。结果表明，与松散的mg90ni10片相比，该材料具有更好的导热性能。此外，本工作还研究了这种复合材料的加氢行为及其在循环加氢过程中的演变。在不同温度和氢气压力下进行循环。高径向透气性、足够的导热性以及稳定的复合材料结构，突显了这种复合材料在高空载动态储氢应用中的潜力。
It is of high technical importance to consider the loading and unloading dynamics of hydride-based hydrogen storage tanks, which are mainly influenced by the heat and gas transfer properties inside the reaction bed. In this regard, hydride-graphite composites offer improved heat transfer properties and higher volumetric storage capacities compared to commonly used powder beds.In this contribution, we report on the cycle stability of densified hydride-graphite composites based on melt-spun Mg90Ni10. The results reveal superior heat conduction properties compared to loose Mg90Ni10flakes. Furthermore, this work deals with the hydrogenation behavior of such composites and their evolution throughout cyclic hydrogenation. Cycles at different temperatures and hydrogen pressures were conducted. High gas permeability in radial direction and sufficient thermal conductivity in combination with a stable composite structure underline the potential of such composites for hydrogen storage applications with high un-/loading dynamics.