Institute for Frontier Materials, Deakin University, Locked Bag 20000, Geelong, Victoria 3220, Australia.
J Am Chem Soc. 2022 Aug 3;144(30):13764-13772. doi: 10.1021/jacs.2c04663. Epub 2022 Jul 22.
Introducing alien intercalations to sub-nanometer scale nanochannels is one desirable strategy to optimize the ion transportation of two-dimensional nanomaterial membranes for improving osmotic energy harvest (OEH). Diverse intercalating agents have been previously utilized to realize this goal in OEH, but with modest performance, complex operations, and physicochemical uncertainty gain. Here, we employ the self-exfoliation behavior of oxidative fragments (OFs) from graphene oxide basal plane under an alkaline environment to encapsulate detached OFs in nanochannels for breaking a trade-off between permeability and selectivity, boosting power density from 1.8 to 4.9 W m with a cation selectivity of 0.9 and revealing a negligible decline in power density and trade-off during a long-term operation test (∼168 h). The strategy of membrane design, employing the intrinsically self-exfoliated OFs to decorate the nanochannels, provides an alternative and facile approach for ion separation, OEH, and other nano-fluidic applications.
将外来夹层引入亚纳米级纳米通道是优化二维纳米材料膜离子传输以提高渗透能量收集（OEH）的一种理想策略。以前在 OEH 中使用了多种夹层剂来实现这一目标，但性能一般、操作复杂且获得的物理化学不确定性较大。在这里，我们利用氧化片段（OFs）在碱性环境下从氧化石墨烯基面的自剥离行为，将分离的 OFs 封装在纳米通道中，打破了渗透性和选择性之间的权衡，将功率密度从 1.8 提高到 4.9 W m，阳离子选择性为 0.9，并在长期运行测试（约 168 h）中揭示了功率密度和权衡的可忽略下降。采用具有内在自剥离性能的 OFs 来修饰纳米通道的膜设计策略为离子分离、OEH 和其他纳米流体应用提供了一种替代且简单的方法。
