Strategies toward Enhanced Low-Pressure Volumetric Hydrogen Storage in Nanoporous Cryoadsorbents

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• 作者：Afsana Ahmed ; Aaron W. Thornton ; Kristina Konstas ; Sridhar Kumar Kannam ; Ravichandar Babarao ; B. D. Todd ; Anita J. Hill ; Matthew R. Hill
• 刊名：Langmuir
• 出版年：2013
• 出版时间：December 17, 2013
• 年：2013
• 卷：29
• 期：50
• 页码：15689-15697
• 全文大小：596K
• 年卷期：v.29,no.50(December 17, 2013)
• ISSN：1520-5827

文摘

The volumetric hydrogen capacity remains one of the most challenging criteria for on-board hydrogen storage system requirements. Here a new concept for hydrogen storage of porous aromatic frameworks (PAFs) impregnated with lithium-decorated fullerenes (Li₆C₆₀) is described. The loading of Li₆C₆₀ and the effect on the adsorption of hydrogen (H₂) has been investigated by molecular simulation. It is shown that the incorporation of Li₆C₆₀ can enhance the volumetric capacity of H₂ from 12 to 44 g L^鈥?, a 260% increase at 10 bar and 77 K. The impregnation of Li₆C₆₀ increases the heat of adsorption and surface area at the cost of the available pore volume. However, the increase in adsorbed hydrogen outweighs any pore volume loss under optimized Li₆C₆₀ loading and operating conditions. In addition, the H₂ volumetric uptake is shown to correlate with the volumetric surface area at all pressures whereas the H₂ gravimetric uptake correlates with the heat of adsorption at low pressures, surface area at moderate pressures, and pore volume at high pressures.