Separation membranes with homogeneous charge channels are the mainstream to reject charged mass by forming electrical double layer (EDL). However, the EDL often compresses effective solvent transport space and weakens channel‐ion interaction. Here, built‐in electric fields (BIEFs) are constructed in lamellar membranes by assembling the heterostructured nanosheets, which contain alternate positively‐charged nanodomains and negatively‐charged nanodomains. We demonstrate that the BIEFs are perpendicular to horizontal channel and the direction switches alternately, significantly weakening the EDL effect and forces ions to repeatedly collide with channel walls. Thus, highly efficient rejection for charged mass (salts, dyes, and organic acids/bases) and ultrafast water transport are achieved. Moreover, for desalination on four‐stage filtration option, salt rejection reaches 99.9% and water permeance reaches 19.2 L m‐2 h‐1 bar‐1. Such mass transport behavior is quite different from that in homogeneous charge channels. Furthermore, the ion transport behavior in nanochannels is elucidated by validating horizontal projectile motion model.

中文翻译：

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异质结构层状膜中的内置电场能够高效排斥带电质量

具有均匀电荷通道的分离膜是通过形成双电层（EDL）来排斥带电物质的主流。然而，EDL 经常压缩有效的溶剂传输空间并削弱通道-离子相互作用。在这里，通过组装异质结构纳米片在层状膜中构建内置电场（BIEF），其中包含交替的带正电纳米域和带负电纳米域。我们证明了 BIEF 垂直于水平通道并且方向交替切换，显着削弱了 EDL 效应并迫使离子与通道壁反复碰撞。因此，实现了对带电质量（盐、染料和有机酸/碱）的高效排斥和超快的水传输。此外，对于采用四级过滤选项的海水淡化，脱盐率达到 99.9%，水渗透率达到 19.2 L m-2 h-1 bar-1。这种质量传输行为与均质电荷通道中的质量传输行为完全不同。此外，通过验证水平抛射运动模型阐明了纳米通道中的离子传输行为。