High-pressure adsorptive storage of hydrogen in MIL-101 (Cr) and AX-21 for mobile applications: cryocharging and cryokinetics
High-pressure adsorptive storage of hydrogen in MIL-101 (Cr) and AX-21 for mobile applications: cryocharging and cryokinetics
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DOI：
10.1016/j.matdes.2015.10.069
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发表时间：
2016-01
影响因子：
8.4
通讯作者：
Nuno Bimbo;Wesley Xu;J. Sharpe;V. Ting;T. Mays
中科院分区：
文献类型：
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作者：
Nuno Bimbo;Wesley Xu;J. Sharpe;V. Ting;T. Mays
目前最先进的方法包括在复合气瓶中容纳高压压缩氢，固态储氢材料是一种替代品，可以通过提高体积密度来改善储存性能。一种新的策略，使用低温的温度来加载氢（cryocharging）的建议和分析，在这项工作中，空气缸和容器的密度和最终的存储压力与高表面积材料MIL-101（铬）和AX-21进行比较。结果表明，低温充电是一个可行的选择，因为它可以大大降低充电（在77 K）和最终压力（在298 K）的大多数情况下考虑。动力学是一个同样重要的要求储氢系统，因此，在这些条件下的两种材料的有效扩散系数进行了计算，并显示出与金属有机框架和沸石从准弹性中子散射和分子模拟估计的值。为储氢量身定制的高表面积材料是用于移动的应用中的存储的有前途的途径，并且结果表明低温充电是用于储氢系统的有前途的策略，因为它增加体积密度并且避免在高压和/或低温下操作的能量损失。
Current state-of-the-art methods consist of containing high-pressure compressed hydrogen in composite cylinders, with solid-state hydrogen storage materials an alternative that could improve on storage performance by enhancing volumetric densities. A new strategy that uses cryogenic temperatures to load hydrogen (cryocharging) is proposed and analysed in this work, comparing densities and final storage pressures for empty cylinders and containers with the high-surface area materials MIL-101 (Cr) and AX-21. Results show cryocharging as a viable option, as it can substantially lower the charging (at 77 K) and final pressures (at 298 K) for the majority of the cases considered. Kinetics are an equally important requirement for hydrogen storage systems, so the effective diffusivities at these conditions for both materials were calculated, and showed values comparable to the ones estimated in metal–organic frameworks and zeolites from quasielastic neutron scattering and molecular simulations. High-surface area materials tailored for hydrogen storage are a promising route for storage in mobile applications and results show that cryocharging is a promising strategy for hydrogen storage systems, since it increases volumetric densities and avoids energy penalties of operating at high pressures and/or low temperatures.