Heat and gas transport properties in pelletized hydride–graphite-composites for hydrogen storage applications
Heat and gas transport properties in pelletized hydride–graphite-composites for hydrogen storage applications
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DOI：
10.1016/j.ijhydene.2012.09.159
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发表时间：
2013-02
影响因子：
7.2
通讯作者：
C. Pohlmann;L. Röntzsch;T. Weissgärber;B. Kieback
中科院分区：
文献类型：
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作者：
C. Pohlmann;L. Röntzsch;T. Weissgärber;B. Kieback
金属氢化物适用于紧凑、高效、安全的氢气储存。考虑到氢化物基储氢储罐，增强氢化物床的热和气体传输特性对于增加(卸载)储氢储罐的动力是至关重要的。在这项贡献中，讨论了不同的储氢材料(锂、丙酸钠、氢化镁和过渡金属氢化物C5)与膨胀天然石墨(ENG)的粒状复合材料。这些材料掺入高达25wt.%的ENG，并在高达600 Mpa的压实压力下进行压实。由此得到的氢化物-ENG颗粒具有更高的有效导热系数，可以在很大范围内进行调节。与疏松氢化物粉末相比，该颗粒具有更大的体积储氢容量。径向的高气体渗透性和足够的导热系数(>；10W/m−1K−1)与稳定的颗粒结构相结合，表明此类制备的氢化物-ENG复合材料在高加载动态下的储氢应用中具有很高的潜力。
Metal hydrides are suitable for the compact, efficient and safe storage of hydrogen. Considering hydride-based hydrogen storage tanks, the enhancement of the heat and gas transport properties of the hydride bed is crucial for increased (un-)loading dynamics of the tank. In this contribution, pelletized composites of different hydrogen storage materials (lithium amide, sodium alanate, magnesium hydride and transition metal hydride Hydralloy C5) with expanded natural graphite (ENG) are discussed. The materials were admixed with up to 25 wt.% ENG and compacted at compaction pressures up to 600 MPa. The resulting hydride-ENG pellets exhibit an increased effective thermal conductivity which can be tuned in a wide range. The pellets have an increased volumetric H2storage capacity compared to loose hydride powders. High gas permeability in radial direction and sufficient thermal conductivity (>10 W m−1K−1) in combination with a stable pellet structure indicate a high potential to use suchlike prepared hydride-ENG composites for hydrogen storage applications with high loading dynamics.