Separation of Hydrogen and Nitrogen Gases with Porous Graphene Membrane
Separation of Hydrogen and Nitrogen Gases with Porous Graphene Membrane
复制标题
用多孔石墨烯膜分离氢气和氮气
DOI：
10.1021/jp206258u
复制
发表时间：
2011-12-01
影响因子：
3.7
通讯作者：
Zhao, Yuliang
中科院分区：
文献类型：
--
作者：
Du, Huailiang;Li, Jingyuan;Zhao, Yuliang
我们设计了一系列多孔石墨烯作为H2/N2分离膜。选择性和渗透性可以通过钻取具有不同形状和尺寸的各种纳米孔来控制。氢气和氮气渗透通过多孔石墨烯的机制是不同的。由于尺寸限制，小的纳米孔（孔-11）只能允许氢分子渗透。在较大纳米孔的系统中（例如，孔-13、孔-14等），在孔径足够大以允许氮分子不受任何限制地渗透的情况下，我们观察到氮的渗透事件多于氢分子的渗透事件。其原因是氮分子与石墨烯膜之间的货车范德华相互作用使氮分子在石墨烯表面聚集。当孔径进一步增大时，氢分子流量与孔面积呈线性关系，而氮分子流量与孔面积没有明显的相关性。
We designed a series of porous graphene as the separation membrane of H2/N2. The selectivity and permeability could be controlled by drilling various nanopores with different shapes and sizes. The mechanisms of hydrogen and nitrogen to permeate through the porous graphene are different. The small nanopore (pore-11) can only allow the hydrogen molecules to permeate due to the size restriction. In the systems of bigger nanopores (e.g., pore-13, pore-14, etc.), where the pore size is big enough to allow nitrogen molecules to permeate without any restriction, we observed more permeation events of nitrogen than that of hydrogen molecules. The reason is that the van der Waals interactions with the graphene membrane make the nitrogen molecules accumulate on the surface of graphene. When the pore size further increases, the flow of hydrogen molecules exhibits the linear dependence on the pore area, while there is no obvious correlation between the flow of nitrogen molecules and the pore area.