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首页> 外文会议>Meeting of the Electrochemical Society;International Meeting on Chemical Sensors >Selective Cation Transport through Graphene in Nation Graphene Nation Membranes
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Selective Cation Transport through Graphene in Nation Graphene Nation Membranes

机译：通过民族的石墨烯选择性阳离子运输 石墨烯 国家膜

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Graphene and related two-dimensional (2D) materials are being intensively studied for use in membrane separators. The ultrathin nature of 2D materials combined with the opportunities they afford for intentional creation of nanometer-sized pores having controllable size and chemical character could allow for membrane separations with high flux and also high selectivity. Proton transport through graphene is especially interesting because it may occur through the intact pristine graphene rather than through defects/pores. Other cations, for example lithium or sodium, may pass through graphene but that transport is through to occur through defects/pores. This presentation will focus on selective cation transport through graphene layers that are embedded between Nafion membranes. Ion transmission through graphene is measured using a four-electrode cell in which two Luggin capillaries sense the potential difference that develops across the membrane in response to an ion current that is driven by a pair of platinum wire drive electrodes. Proton transmission in this cell configuration occurs more than 100 times faster than transport of any other ion. This difference is thought to reflect the different mechanisms by which protons and other cations pass though graphene. The lecture will discuss defect characterization in CVD graphene films, and will consider the role of defects, which are in fact nanopores, in allowing for selective transport of ions through graphene.
机译：石墨烯和相关的二维（2D）材料正在集中研究用于膜分离器。 2D材料的超薄性质与有意创建具有可控尺寸和化学特性的纳米尺寸孔的机会相结合，可以允许具有高通量的膜分离和高选择性。通过石墨烯的质子传输是特别有趣的，因为它可能通过完整的原始石墨烯而不是通过缺陷/孔发生。其他阳离子，例如锂或钠，可以通过石墨烯，但是通过缺陷/孔发生运输通过。该介绍将专注于通过嵌入Nafion膜之间的石墨烯层的选择性阳离子运输。通过石墨烯的离子传递使用四电极电池测量，其中两个螺旋毛细管感测响应于由一对铂导线驱动电极驱动的离子电流在膜上产生的电位差。该电池配置中的质子传输发生的时间比任何其他离子的运输快100倍以上。认为这种差异反映了质子和其他阳离子通过石墨烯的不同机制。讲座将讨论CVD石墨烯薄膜中的缺陷表征，并将考虑缺陷的作用，其实际上是纳米孔，允许通过石墨烯选择性地运输离子。

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