Proton and molecular permeation through the basal plane of monolayer graphene oxide.
Proton and molecular permeation through the basal plane of monolayer graphene oxide.
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DOI：
10.1038/s41467-023-43637-w
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发表时间：
2023-11-27
影响因子：
16.6
通讯作者：
Lozada-Hidalgo, M
中科院分区：
文献类型：
--
作者：
Wu, Z F;Sun, P Z;Wahab, O J;Tan, Y T;Barry, D;Periyanagounder, D;Pillai, P B;Dai, Q;Xiong, W Q;Vega, L F;Lulla, K;Yuan, S J;Nair, R R;Daviddi, E;Unwin, P R;Geim, A K;Lozada-Hidalgo, M
二维（2D）材料提供了膜的前景，所述膜将可忽略的气体渗透性与高质子传导性结合联合收割机，并且可以优于在包括燃料电池的各种应用中使用的现有质子交换膜。氧化石墨烯（GO）是一种众所周知的2D材料，其促进质子沿其基面沿着的快速传输，但跨其的质子传导性仍然未知。还经常假定单个GO单层包含大密度的纳米级针孔，其导致相当大的气体泄漏穿过GO基面。在这里，我们表明，单层GO的相对较大的微米级区域是不渗透气体的，包括氦气，同时表现出通过基面的质子传导性，其比石墨烯高近两个数量级。这些发现提供了对GO的关键特性的见解，并证明2D晶体的化学官能化可用于增强其质子透明度，而不影响气体不渗透性。据推测，GO单层总是包含大密度的纳米级针孔。在这里，作者提出了气体和质子传输测量，表明GO单层可以在微米级面积上无针孔。
Two-dimensional (2D) materials offer a prospect of membranes that combine negligible gas permeability with high proton conductivity and could outperform the existing proton exchange membranes used in various applications including fuel cells. Graphene oxide (GO), a well-known 2D material, facilitates rapid proton transport along its basal plane but proton conductivity across it remains unknown. It is also often presumed that individual GO monolayers contain a large density of nanoscale pinholes that lead to considerable gas leakage across the GO basal plane. Here we show that relatively large, micrometer-scale areas of monolayer GO are impermeable to gases, including helium, while exhibiting proton conductivity through the basal plane which is nearly two orders of magnitude higher than that of graphene. These findings provide insights into the key properties of GO and demonstrate that chemical functionalization of 2D crystals can be utilized to enhance their proton transparency without compromising gas impermeability. GO monolayers are presumed to invariably contain a large density of nanoscale pinholes. Here the authors present gas and proton transport measurements which show that GO monolayers can be pinhole-free over micrometer-scale areas.