A 3D nm-thin biomimetic membrane for ultimate molecular separation
A 3D nm-thin biomimetic membrane for ultimate molecular separation
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DOI：
10.1039/d0mh00853b
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发表时间：
2020-09
影响因子：
13.3
通讯作者：
Tongshuai Wang;Siwei Liang;Zhen Qi;M. Biener;T. Voisin;J. Hammons;Ich Tran;M. Worsley;T. Braun;Yinmin M Wang;J. Biener;T. Baumann;Sangil Kim;Jianchao Ye
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文献类型：
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作者：
Tongshuai Wang;Siwei Liang;Zhen Qi;M. Biener;T. Voisin;J. Hammons;Ich Tran;M. Worsley;T. Braun;Yinmin M Wang;J. Biener;T. Baumann;Sangil Kim;Jianchao Ye
具有高渗透性和高选择性的多功能膜可以模仿自然界的设计，具有巨大的工业和生物医学应用。在这里，我们报告了一个新的概念，三维纳米（nm）薄膜，可以克服传统的膜结构的缺点。我们的3D膜由两个三维交织的通道组成，这些通道由连续的nm薄的无定形TiO 2层隔开。这种3D架构将表面积大幅增加了6000倍，加上通过2-4 nm薄的选择性层的超短扩散距离，允许超快的气体和水传输，1000 l m−2 h−1 bar−1。由于结合了基于尺寸和电荷的排斥机制，3D膜还表现出非常高的离子排斥率（对于铁氰化钾，R <100%）。高离子截留率和超快渗透的结合使我们的3DM上级最先进的高通量膜，其性能受到通量截留率权衡的限制。此外，其对多硫化物或气体的最终Li+选择性可能解决储能应用中的主要技术挑战，例如锂硫或锂氧电池。
Multi-functional membranes with high permeance and selectivity that can mimic nature's designs have tremendous industrial and bio-medical applications. Here, we report a novel concept of a 3D nanometer (nm)-thin membrane that can overcome the shortcomings of conventional membrane structures. Our 3D membrane is composed of two three-dimensionally interwoven channels that are separated by a continuous nm-thin amorphous TiO2 layer. This 3D architecture dramatically increases the surface area by 6000 times, coupled with an ultra-short diffusion distance through the 2–4 nm-thin selective layer that allows for ultrafast gas and water transport, ∼900 l m−2 h−1 bar−1. The 3D membrane also exhibits a very high ion rejection (R ∼ 100% for potassium ferricyanide) due to the combined size- and charge-based exclusion mechanisms. The combination of high ion rejection and ultrafast permeation makes our 3DM superior to the state-of-the-art high-flux membranes whose performances are limited by the flux-rejection tradeoff. Furthermore, its ultimate Li+ selectivity over polysulfide or gas can potentially solve major technical challenges in energy storage applications, such as lithium–sulfur or lithium–O2 batteries.