The potential of organic polymer-based hydrogen storage materials
The potential of organic polymer-based hydrogen storage materials
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DOI：
10.1039/b618053a
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发表时间：
2007-01-01
影响因子：
3.3
通讯作者：
Walton, Allan
中科院分区：
文献类型：
--
作者：
Budd, Peter M.;Butler, Anna;Walton, Allan
汽车用高体积密度和高重量密度储氢的挑战促使人们研究微孔有机聚合物内表面积上的冷冻吸附潜力。人们研究了一系列具有本征微孔率的聚合物(PIM)，其中迄今为止最好的PIM(含有三茂铁亚单位的网络PIM)在10bar/77K下的质量分数为2.7%H-2。超交联型聚合物(HCP)也显示出作为H-2存储材料的良好性能，特别是在压力410bar的情况下。比较了6种PIM和1种HCP在77K时对N-2和H-2的吸附行为。基于高压下H2吸附的Langmuir图的表面积可以为氢容量提供有用的指导，但基于低压数据的Langmuir图低估了潜在的H2吸收。微孔分布影响H2等温线的形成，较高的超微孔密度(孔径为0.7 nm)与增强的低压吸附有关。
The challenge of storing hydrogen at high volumetric and gravimetric density for automotive applications has prompted investigations into the potential of cryo-adsorption on the internal surface area of microporous organic polymers. A range of Polymers of Intrinsic Microporosity (PIMs) has been studied, the best PIM to date (a network-PIM incorporating a triptycene subunit) taking up 2.7% H-2 by mass at 10 bar/77 K. HyperCrosslinked Polymers (HCPs) also show promising performance as H-2 storage materials, particularly at pressures 410 bar. The N-2 and H-2 adsorption behaviour at 77 K of six PIMs and a HCP are compared. Surface areas based on Langmuir plots of H2 adsorption at high pressure are shown to provide a useful guide to hydrogen capacity, but Langmuir plots based on low pressure data underestimate the potential H2 uptake. The micropore distribution influences the form of the H2 isotherm, a higher concentration of ultramicropores (pore size < 0.7 nm) being associated with enhanced low pressure adsorption.