Clay-based 2D nanofluidics are promising candidates for promoting practical application of osmotic energy harvesting owing to their low cost and simple large-scale preparation, but they usually suffer from poor mechanical strength and unsatisfactory ion selectivity. Herein, the nanofiber reinforcement strategy is proposed to address these two key issues of clay-based 2D nanofluidics for achieving highly-efficient osmotic energy harvesting. The aramid nanofibers (ANFs) are intercalated into lameller montmorillonite (MMT) membrane to construct robust 2D nanofluidics. In this configuration, the introduction of negatively-charged ANFs greatly enhances the mechanical strength of MMT nanofluidic membrane, and further improves the cation selectivity towards high-efficient osmotic energy conversion. The ANF-reinforced MMT nanofluidics could delivery a maximum power output up to ~5.16 W m⁻² under 50-fold salinity gradient (KCl) simulating sea/river junction environment, which is remarkably superior to almost all reported clay-based 2D nanofluidics. The osmotic power can be further increased to 6.45 W m⁻² at a higher temperature of 50 ºC. Furthermore, the 2D nanofluidic membrane can withstand extreme water environments such as strong acidity/alkalinity and high salinity for over 20 days. This work is envisaged to provide a new strategy in the construction of robust clay-based 2D nanofluidics towards pushing osmotic energy harvesting into real-world applications.

基于粘土的二维纳米流体由于其低成本和简单的大规模制备而成为促进渗透能量收集实际应用的有希望的候选者，但它们通常具有较差的机械强度和不令人满意的离子选择性。在此，提出了纳米纤维增强策略来解决基于粘土的二维纳米流体的这两个关键问题，以实现高效的渗透能量收集。芳纶纳米纤维 (ANF) 嵌入到层状蒙脱石 (MMT) 膜中，以构建坚固的二维纳米流体。在这种配置中，带负电荷的 ANFs 的引入极大地增强了 MMT 纳米流体膜的机械强度，并进一步提高了阳离子对高效渗透能转换的选择性。^-2在 50 倍盐度梯度 (KCl) 下模拟海/河交界环境，这明显优于几乎所有报道的基于粘土的二维纳米流体。在 50 ºC 的较高温度下，渗透功率可进一步增加到 6.45 W m ^-2。此外，二维纳米流体膜可以承受强酸/碱度和高盐度等极端水环境20天以上。这项工作旨在为构建坚固的粘土基二维纳米流体提供一种新策略，以推动渗透能量收集进入实际应用。