A manganese hydride molecular sieve for practical hydrogen storage under ambient conditions
A manganese hydride molecular sieve for practical hydrogen storage under ambient conditions
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DOI：
10.1039/c8ee02499e
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发表时间：
2019-05-01
影响因子：
32.5
通讯作者：
Antonelli, David M.
中科院分区：
文献类型：
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作者：
Morris, Leah;Hales, James J.;Antonelli, David M.
迄今为止，由于缺乏满足所有要求的廉价且方便的氢存储解决方案，特别是在长途运输和运输基础设施领域，可行的氢经济受到阻碍。目前的方法需要高压和/或复杂的热管理系统来实现可接受的存储密度。本文中，我们提出了一种氢化锰分子筛，其可以容易地由廉价的前体合成，并且在环境温度下在120巴下表现出10.5wt%和197 kgH（2）m（-3）的可逆过量吸附性能，并且在54次循环后没有活性损失。非弹性中子散射和计算研究证实库巴斯绑定的主要机制。中性吸附过程允许简单的系统，而不需要使用中等压力作为切换的热管理。具有这些特性的存储材料将允许DOE系统实现存储和交付目标，为现有系统（如700 bar系统）提供实用的替代方案，这些系统通常提供40 kgH（2）m（-3）或更小的体积存储值，同时保留优于电池的优势，如填充时间和能量密度。由于系统实施项目的总储能成本比700 bar储罐的总储能成本便宜约5倍，因此合理估计了生产成本和性能损失，这可能为更多地采用氢作为能源载体打开大门。
A viable hydrogen economy has thus far been hampered by the lack of an inexpensive and convenient hydrogen storage solution meeting all requirements, especially in the areas of long hauls and delivery infrastructure. Current approaches require high pressure and/or complex heat management systems to achieve acceptable storage densities. Herein we present a manganese hydride molecular sieve that can be readily synthesized from inexpensive precursors and demonstrates a reversible excess adsorption performance of 10.5 wt% and 197 kgH(2) m(-3) at 120 bar at ambient temperature with no loss of activity after 54 cycles. Inelastic neutron scattering and computational studies confirm Kubas binding as the principal mechanism. The thermodynamically neutral adsorption process allows for a simple system without the need for heat management using moderate pressure as a toggle. A storage material with these properties will allow the DOE system targets for storage and delivery to be achieved, providing a practical alternative to incumbents such as 700 bar systems, which generally provide volumetric storage values of 40 kgH(2) m(-3) or less, while retaining advantages over batteries such as fill time and energy density. Reasonable estimates for production costs and loss of performance due to system implementation project total energy storage costs roughly 5 times cheaper than those for 700 bar tanks, potentially opening doors for increased adoption of hydrogen as an energy vector.