期刊
JOURNAL OF MOLECULAR MODELING
卷 19, 期 10, 页码 4079-4087出版社
SPRINGER
DOI: 10.1007/s00894-012-1700-0
关键词
Hydrogen adsorption; Monte Carlo simulations; Porous carbons
类别
资金
- United States Department of Energy [DE-FG02-07ER46411]
Properties of a new class of hypothetical high-surface-area porous carbons (open carbon frameworks) have been discussed. The limits of hydrogen adsorption in these carbon porous structures have been analyzed in terms of competition between increasing surface accessible for adsorption and the lowering energy of adsorption. From an analysis of an analytical model and simulations of adsorption the physical limits of hydrogen adsorption have been defined: (i) higher storage capacities in slit-shaped pores can be obtained by fragmentation/truncation of graphene sheets into nano-metric elements which creates surface areas in excess of 2600 m(2)/g, the surface area for infinite graphene sheets; (ii) the positive influence of increasing surface area is compensated by the decreasing energy of adsorption in the carbon scaffolds of nano-metric sizes; (iii) for open carbon frameworks (OCF) built from coronene and benzene molecules with surface areas 6500 m(2) g(-1), we find an impressive excess adsorption of 75-110 g H-2/kg C at 77 K, and high storage capacity of 110-150 g H-2/kg C at 77 K and 100 bar; (iv) the new OCF, if synthesized and optimized, could lead to required hydrogen storage capacity for mobile applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据